1. The document discusses various types of fluid flow including Newtonian and non-Newtonian systems.
2. It describes properties like viscosity and how they are measured using instruments like capillary viscometers, falling sphere viscometers, and rotational viscometers.
3. Non-Newtonian fluids exhibit time-dependent viscosity changes under stress like thixotropy, and can have plastic, pseudoplastic, or dilatant behaviors that alter viscosity with shear rates.
Rheology is the science of flow and deformation of matter under stress. There are two main types of materials: Newtonian and non-Newtonian. Newtonian materials follow Newton's law of viscosity, where shear stress is directly proportional to shear rate. Non-Newtonian materials do not follow this relationship and can be plastic, pseudoplastic, or dilatant. Pseudoplastic materials become less viscous at higher shear rates, while dilatant materials become more viscous. Thixotropic materials are pseudoplastic and their viscosity is time-dependent, decreasing under shear and increasing back over time after shear is removed.
Rheology is the study of deformation and flow of matter. There are several types of rheological properties including stress, viscosity, viscoelastic modulus, creep, and relaxation times. Rheology is important in manufacturing pharmaceutical dosage forms and applications like ointments, syrups, suspensions, and emulsions where rheological properties influence acceptability, bioavailability, and handling. Materials can exhibit Newtonian, plastic, pseudo-plastic, or dilatant flow depending on the relationship between shear stress and shear rate. Viscometers are used to determine viscosity and classify fluids as Newtonian or non-Newtonian.
This document discusses rheology and viscosity measurement techniques. It covers key topics like:
1) Newtonian and non-Newtonian flow, including plastic, pseudoplastic and dilatant systems.
2) Measurement of viscosity using viscometers like capillary, falling sphere and rotational viscometers.
3) Phenomena like thixotropy, antithixotropy and their significance in formulations.
The document provides an overview of important rheological concepts and methods to characterize the flow behavior and viscosity of formulations.
Physical Pharmacy M02 discusses rheology and the measurement of viscosity. It covers Newtonian and non-Newtonian flow, including plastic, pseudoplastic, and dilatant behaviors. Key concepts are thixotropy and antithixotropy. Methods to measure viscosity include capillary, falling sphere, and rotational viscometers. Understanding viscosity is important for formulating drug delivery systems and ensuring patient acceptability.
Rheology is the science describing the flow and deformation of matter under stress. Viscosity describes a fluid's resistance to flow and is dependent on factors like temperature, pressure, and shear rate. Newtonian fluids have a constant viscosity regardless of shear rate, while non-Newtonian fluids have variable viscosity. Common non-Newtonian behaviors include plastic flow, pseudoplastic (shear-thinning) flow, and dilatant (shear-thickening) flow. Thixotropy is time-dependent shear thinning where viscosity decreases under shear and recovers with time. Viscometers like capillary, falling ball, and rotational viscometers are used to measure viscosity. Rheology is important in formulation development
This document discusses rheology and the importance of understanding flow properties in pharmaceutical manufacturing and product administration. It defines rheology as the study of flow and deformation of matter under stress. The document covers various types of fluid flow including Newtonian, plastic, pseudoplastic and dilatant. It also discusses thixotropy and measurement of viscosity using single point viscometers like Ostwald and falling sphere, as well as multi-point viscometers like cup and bob and cone and plate. Understanding rheology is important for developing dosage forms and ensuring their proper handling and administration.
1. The document discusses different types of viscometers used to measure viscosity and flow properties of fluids. It also describes Newtonian and non-Newtonian fluid behavior.
2. Newtonian fluids have viscosities that are constant and not dependent on shear rates or flow conditions. Non-Newtonian fluids exhibit viscosities that change with applied stresses or shear rates.
3. Non-Newtonian behavior includes shear thinning, shear thickening, and time-dependent effects like thixotropy and rheopexy where viscosity depends on flow history or duration of shearing. Many materials exhibit both viscous and elastic properties.
Viscometry,newtonian & non newtonian flow behaviourShyamala C
1. The document discusses different types of viscometers used to measure viscosity and flow properties of fluids. It also describes Newtonian and non-Newtonian fluid behavior.
2. Newtonian fluids have viscosities that are constant and not dependent on shear rates or flow conditions. Non-Newtonian fluids exhibit viscosities that change with applied stresses or shear rates.
3. Non-Newtonian behavior includes shear thinning, shear thickening, and time-dependent effects like thixotropy and rheopexy where viscosity depends on flow history or duration of shearing. Many materials exhibit both viscous and elastic properties.
Rheology is the science of flow and deformation of matter under stress. There are two main types of materials: Newtonian and non-Newtonian. Newtonian materials follow Newton's law of viscosity, where shear stress is directly proportional to shear rate. Non-Newtonian materials do not follow this relationship and can be plastic, pseudoplastic, or dilatant. Pseudoplastic materials become less viscous at higher shear rates, while dilatant materials become more viscous. Thixotropic materials are pseudoplastic and their viscosity is time-dependent, decreasing under shear and increasing back over time after shear is removed.
Rheology is the study of deformation and flow of matter. There are several types of rheological properties including stress, viscosity, viscoelastic modulus, creep, and relaxation times. Rheology is important in manufacturing pharmaceutical dosage forms and applications like ointments, syrups, suspensions, and emulsions where rheological properties influence acceptability, bioavailability, and handling. Materials can exhibit Newtonian, plastic, pseudo-plastic, or dilatant flow depending on the relationship between shear stress and shear rate. Viscometers are used to determine viscosity and classify fluids as Newtonian or non-Newtonian.
This document discusses rheology and viscosity measurement techniques. It covers key topics like:
1) Newtonian and non-Newtonian flow, including plastic, pseudoplastic and dilatant systems.
2) Measurement of viscosity using viscometers like capillary, falling sphere and rotational viscometers.
3) Phenomena like thixotropy, antithixotropy and their significance in formulations.
The document provides an overview of important rheological concepts and methods to characterize the flow behavior and viscosity of formulations.
Physical Pharmacy M02 discusses rheology and the measurement of viscosity. It covers Newtonian and non-Newtonian flow, including plastic, pseudoplastic, and dilatant behaviors. Key concepts are thixotropy and antithixotropy. Methods to measure viscosity include capillary, falling sphere, and rotational viscometers. Understanding viscosity is important for formulating drug delivery systems and ensuring patient acceptability.
Rheology is the science describing the flow and deformation of matter under stress. Viscosity describes a fluid's resistance to flow and is dependent on factors like temperature, pressure, and shear rate. Newtonian fluids have a constant viscosity regardless of shear rate, while non-Newtonian fluids have variable viscosity. Common non-Newtonian behaviors include plastic flow, pseudoplastic (shear-thinning) flow, and dilatant (shear-thickening) flow. Thixotropy is time-dependent shear thinning where viscosity decreases under shear and recovers with time. Viscometers like capillary, falling ball, and rotational viscometers are used to measure viscosity. Rheology is important in formulation development
This document discusses rheology and the importance of understanding flow properties in pharmaceutical manufacturing and product administration. It defines rheology as the study of flow and deformation of matter under stress. The document covers various types of fluid flow including Newtonian, plastic, pseudoplastic and dilatant. It also discusses thixotropy and measurement of viscosity using single point viscometers like Ostwald and falling sphere, as well as multi-point viscometers like cup and bob and cone and plate. Understanding rheology is important for developing dosage forms and ensuring their proper handling and administration.
1. The document discusses different types of viscometers used to measure viscosity and flow properties of fluids. It also describes Newtonian and non-Newtonian fluid behavior.
2. Newtonian fluids have viscosities that are constant and not dependent on shear rates or flow conditions. Non-Newtonian fluids exhibit viscosities that change with applied stresses or shear rates.
3. Non-Newtonian behavior includes shear thinning, shear thickening, and time-dependent effects like thixotropy and rheopexy where viscosity depends on flow history or duration of shearing. Many materials exhibit both viscous and elastic properties.
Viscometry,newtonian & non newtonian flow behaviourShyamala C
1. The document discusses different types of viscometers used to measure viscosity and flow properties of fluids. It also describes Newtonian and non-Newtonian fluid behavior.
2. Newtonian fluids have viscosities that are constant and not dependent on shear rates or flow conditions. Non-Newtonian fluids exhibit viscosities that change with applied stresses or shear rates.
3. Non-Newtonian behavior includes shear thinning, shear thickening, and time-dependent effects like thixotropy and rheopexy where viscosity depends on flow history or duration of shearing. Many materials exhibit both viscous and elastic properties.
This document discusses rheology, which is the branch of physics dealing with the deformation and flow of liquids. It provides definitions and examples of different types of fluid flow, including Newtonian, plastic, pseudoplastic, and dilatant flow. Key aspects covered include viscosity, shear stress, yield value, and the effects of temperature, particle concentration, and other factors on rheological properties. Common instruments used to measure viscosity, such as capillary, falling sphere, cup and bob, and cone and plate viscometers are also described.
Rheology pharmaceutics ppt by muhammaad ahmadAhmadAslam39
The document defines rheology as the science concerned with the deformation and flow of matter under stress. It discusses key rheological concepts such as elastic deformation, plastic deformation, viscosity, and Newtonian and non-Newtonian fluids. Common types of non-Newtonian fluids include plastic, pseudoplastic, and dilatant fluids. The document also outlines several methods for measuring viscosity and the importance of rheology in pharmaceutical applications such as ensuring stability, improving solubility and bioavailability, and optimizing manufacturing processes.
Rheology is the investigation of the progression of issue, fundamentally in a fluid state, yet in addition as "delicate solids" or solids under conditions in which they react with plastic stream as opposed to distorting flexibly because of an applied power. Rheology is the study of misshapening and stream inside a material.
This document provides an overview of rheology concepts including:
1. It defines rheology as the science concerned with the deformation of matter under stress.
2. It describes Newtonian and non-Newtonian fluids, explaining that Newtonian fluids have a constant viscosity while non-Newtonian fluids have variable viscosity.
3. It discusses the different types of non-Newtonian flow - plastic, pseudoplastic, and dilatant - and provides examples of materials that exhibit each type of flow.
Rheology is the study of deformation and flow of matter. It governs the flow of fluids in the body like blood, lymph, and mucus. From a rheological perspective, materials are solids, liquids, or gases depending on whether their shape and volume remain constant under forces. The flow properties of materials determine how easily substances like emulsions and ointments can be processed and used. Materials can exhibit Newtonian or non-Newtonian flow based on whether their viscosity changes with applied stress. Key non-Newtonian flows include plastic, pseudoplastic, and dilatant. Factors like polymer structure, hydration, pH, and temperature affect the rheological properties of pharmaceutical products.
This document provides an introduction to rheology and its relationship to fluid mechanics. It defines rheology as the science describing the flow and deformation of matter under stress. Rheology is relevant to fluids as all fluids flow and deform under stress. The document discusses different material types including elastic solids, plastic materials, and fluids. It describes concepts such as viscosity, shear stress, and normal stress. It also covers non-Newtonian fluids and how their viscosity can vary with applied stress or time. Different types of non-Newtonian fluids like shear-thinning, shear-thickening, Bingham plastics, and thixotropic fluids are defined. The document concludes with sections on viscoelastic behavior, different
Rheology is the science that study flow of fluids. Viscosity is the main parameter of flow. Newtonian & non newtonian are the two types of flow behavior according to newtons law of flow. non-newtonian flow can be plastic, pseudoplastic, dilatant, thixotropic, antithixotropic or rheopexy. viscosity can be determined by using various viscometers such as capillary viscometer, cup & bob viscometer, cone & plate viscometer, falling sphere viscometer, brookfield viscometer, etc. factors affeting viscosity are intrinsic, extrinsic or temperature dependence.
Rheology is the study of the flow and deformation of matter under stress. It describes the relationship between force, deformation, and time. The term rheology was coined in 1920 and comes from Greek words meaning "to flow" and "study of". Rheology applies to both liquids and solids, and deals with viscoelastic materials that have properties of both solids and liquids when subjected to forces over time.
This document discusses rheology, which is the science describing the flow and deformation of matter under stress. It defines key terms like viscosity, shear stress, shear rate, and classifies fluids as Newtonian or non-Newtonian based on their relationship between shear stress and shear rate. Newtonian fluids have a constant viscosity regardless of shear rate, while non-Newtonian fluids have variable viscosity. Plastic, pseudoplastic, and dilatant behaviors are described for non-Newtonian fluids. Thixotropy, which is a time-dependent decrease and recovery of viscosity under shear, is also discussed. The document concludes by explaining the operation and calibration of common viscometers.
Newtonian fluid and Non- Newtonian fluid. PreetiMaurya22
Newtonian and non-Newtonian fluids can be classified based on their viscosity properties. Newtonian fluids have constant viscosity regardless of shear rate or stress. Non-Newtonian fluids have variable viscosity depending on factors like shear rate, stress over time, or prior deformation history. There are several types of non-Newtonian fluids including shear thinning, dilatant, Bingham plastic, thixotropic, and rheopectic fluids. Examples of non-Newtonian behaviors include ketchup becoming thinner with shaking and whipped cream increasing in viscosity over time. The document provides definitions and examples of different fluid types based on their viscosity characteristics.
This document discusses shear stress, shear rate, viscosity, and different types of fluids. It defines Newtonian fluids as having a viscosity that remains constant regardless of external stress. Non-Newtonian fluids do not follow Newton's law of viscosity and can exhibit time-dependent behavior like shear thinning, shear thickening, and thixotropy. Various rheological models are described including Bingham plastic, power law, and Maxwell models. The importance of viscosity measurement in food analysis is discussed for understanding food texture, stability, and consumer acceptability.
This document discusses rheology and viscosity. It defines rheology as the science of flow of fluids and deformation of solids under stress. Viscosity is a measure of a fluid's resistance to flow and is important in formulation of products like creams, ointments, and suspensions. The document describes different types of fluid flow based on viscosity, such as Newtonian, plastic, and pseudoplastic flow. It also discusses instruments used to measure viscosity like capillary, falling sphere, cup and bob, and cone and plate viscometers. Thixotropy, where the viscosity of a fluid decreases under shear stress over time, is also covered.
Rheology is the study of flow and deformation of materials under stress. There are two types of fluids - Newtonian fluids which follow a linear stress-strain relationship and non-Newtonian fluids which do not follow this relationship. Various types of non-Newtonian fluids exist such as plastic, pseudoplastic, dilatant, thixotropic and rheopectic fluids. Flow properties of fluids can be determined using viscometers such as capillary, rotating cylinder and cone plate viscometers. Rheology has applications in various areas including pharmaceuticals, cosmetics, food and construction materials.
The document discusses drilling fluid properties and functions, including:
- Drilling fluids are used to overcome formation pressure, stabilize boreholes, cool and lubricate bits, and transport cuttings.
- There are three basic types of drilling fluids: gas, foam, and liquid.
- Key properties that determine drilling fluid rheology include density, plastic viscosity, yield point, gel strength, and filtration properties.
- Rheological models like Bingham plastic and power law are used to characterize fluid behavior under different flow conditions.
- Proper mud circulation and flow rates must be designed to ensure effective hole cleaning and cutting transport.
This document discusses rheology, the science of deformation of matter under stress. It defines tensile and shearing stresses and explains reversible and irreversible deformations. Viscosity is introduced as the resistance of fluids to flow, with Newtonian fluids obeying the law of proportionality between stress and shear rate. Non-Newtonian fluids are divided into time-dependent categories like thixotropy and time-independent types including plastic, pseudoplastic and dilatant flows. Specific examples and rheograms are provided to illustrate different fluid behaviors.
Rheology is the science that studies the flow and deformation of matter, especially fluids and semisolids, under stress. The document discusses various rheological concepts including viscosity, Newtonian and non-Newtonian flow, plastic flow, pseudoplastic flow, dilatant flow, thixotropy, and anti-thixotropy. It provides examples of different rheological behaviors exhibited by pharmaceutical formulations like suspensions, emulsions, and gels. Various viscometers used to characterize the rheological properties of such formulations are also described.
Viscosity in newtonian and non newtonian fluidsdiarmuidbrennan
1. Viscosity is a measure of fluid resistance to shape deformation and differs between Newtonian and non-Newtonian fluids. The viscosity of non-Newtonian fluids varies with applied force over time.
2. There are several types of non-Newtonian fluids including Bingham plastics, pseudoplastics, Casson plastics, and dilatants, each with different relationships between shear stress and shear rate.
3. Formulas are provided to calculate viscous resistance, power loss, and torque for various applications like lubricated machine parts and fluid bearings. Examples are also given for problems involving immersed objects, fluid rheology, and viscous effects in bearings.
UNIT II RHEOLOGY PPT Physical Pharmaceutics IISarika184542
This document provides an overview of rheology presented by Ms. Sarika Suryawanshi. It defines rheology as the science of flow and deformation of liquids and solids. Key concepts discussed include viscosity, shear stress, shear rate, and factors that influence viscosity such as temperature, molecular weight, and electrolyte concentration. Different types of fluid flow are described including Newtonian, plastic, pseudoplastic, and dilatant. Measurement techniques for viscosity are presented, including capillary, falling sphere, and rotational viscometers. The importance of rheology in manufacturing and administration of dosage forms is highlighted.
This document provides an overview of rheology, which is the study of flow and deformation of materials. It discusses different types of fluid flow including Newtonian, plastic, pseudoplastic and dilatant flow. Key concepts covered include viscosity, shear stress, rate of shear, and factors affecting viscosity. Various rheological measurement techniques are described such as capillary viscometry, falling sphere viscometry, and rotational viscometry. The document also discusses non-Newtonian flow properties including thixotropy, hysteresis, and the Heckel equation.
8 Surprising Reasons To Meditate 40 Minutes A Day That Can Change Your Life.pptxHolistified Wellness
We’re talking about Vedic Meditation, a form of meditation that has been around for at least 5,000 years. Back then, the people who lived in the Indus Valley, now known as India and Pakistan, practised meditation as a fundamental part of daily life. This knowledge that has given us yoga and Ayurveda, was known as Veda, hence the name Vedic. And though there are some written records, the practice has been passed down verbally from generation to generation.
Muktapishti is a traditional Ayurvedic preparation made from Shoditha Mukta (Purified Pearl), is believed to help regulate thyroid function and reduce symptoms of hyperthyroidism due to its cooling and balancing properties. Clinical evidence on its efficacy remains limited, necessitating further research to validate its therapeutic benefits.
This document discusses rheology, which is the branch of physics dealing with the deformation and flow of liquids. It provides definitions and examples of different types of fluid flow, including Newtonian, plastic, pseudoplastic, and dilatant flow. Key aspects covered include viscosity, shear stress, yield value, and the effects of temperature, particle concentration, and other factors on rheological properties. Common instruments used to measure viscosity, such as capillary, falling sphere, cup and bob, and cone and plate viscometers are also described.
Rheology pharmaceutics ppt by muhammaad ahmadAhmadAslam39
The document defines rheology as the science concerned with the deformation and flow of matter under stress. It discusses key rheological concepts such as elastic deformation, plastic deformation, viscosity, and Newtonian and non-Newtonian fluids. Common types of non-Newtonian fluids include plastic, pseudoplastic, and dilatant fluids. The document also outlines several methods for measuring viscosity and the importance of rheology in pharmaceutical applications such as ensuring stability, improving solubility and bioavailability, and optimizing manufacturing processes.
Rheology is the investigation of the progression of issue, fundamentally in a fluid state, yet in addition as "delicate solids" or solids under conditions in which they react with plastic stream as opposed to distorting flexibly because of an applied power. Rheology is the study of misshapening and stream inside a material.
This document provides an overview of rheology concepts including:
1. It defines rheology as the science concerned with the deformation of matter under stress.
2. It describes Newtonian and non-Newtonian fluids, explaining that Newtonian fluids have a constant viscosity while non-Newtonian fluids have variable viscosity.
3. It discusses the different types of non-Newtonian flow - plastic, pseudoplastic, and dilatant - and provides examples of materials that exhibit each type of flow.
Rheology is the study of deformation and flow of matter. It governs the flow of fluids in the body like blood, lymph, and mucus. From a rheological perspective, materials are solids, liquids, or gases depending on whether their shape and volume remain constant under forces. The flow properties of materials determine how easily substances like emulsions and ointments can be processed and used. Materials can exhibit Newtonian or non-Newtonian flow based on whether their viscosity changes with applied stress. Key non-Newtonian flows include plastic, pseudoplastic, and dilatant. Factors like polymer structure, hydration, pH, and temperature affect the rheological properties of pharmaceutical products.
This document provides an introduction to rheology and its relationship to fluid mechanics. It defines rheology as the science describing the flow and deformation of matter under stress. Rheology is relevant to fluids as all fluids flow and deform under stress. The document discusses different material types including elastic solids, plastic materials, and fluids. It describes concepts such as viscosity, shear stress, and normal stress. It also covers non-Newtonian fluids and how their viscosity can vary with applied stress or time. Different types of non-Newtonian fluids like shear-thinning, shear-thickening, Bingham plastics, and thixotropic fluids are defined. The document concludes with sections on viscoelastic behavior, different
Rheology is the science that study flow of fluids. Viscosity is the main parameter of flow. Newtonian & non newtonian are the two types of flow behavior according to newtons law of flow. non-newtonian flow can be plastic, pseudoplastic, dilatant, thixotropic, antithixotropic or rheopexy. viscosity can be determined by using various viscometers such as capillary viscometer, cup & bob viscometer, cone & plate viscometer, falling sphere viscometer, brookfield viscometer, etc. factors affeting viscosity are intrinsic, extrinsic or temperature dependence.
Rheology is the study of the flow and deformation of matter under stress. It describes the relationship between force, deformation, and time. The term rheology was coined in 1920 and comes from Greek words meaning "to flow" and "study of". Rheology applies to both liquids and solids, and deals with viscoelastic materials that have properties of both solids and liquids when subjected to forces over time.
This document discusses rheology, which is the science describing the flow and deformation of matter under stress. It defines key terms like viscosity, shear stress, shear rate, and classifies fluids as Newtonian or non-Newtonian based on their relationship between shear stress and shear rate. Newtonian fluids have a constant viscosity regardless of shear rate, while non-Newtonian fluids have variable viscosity. Plastic, pseudoplastic, and dilatant behaviors are described for non-Newtonian fluids. Thixotropy, which is a time-dependent decrease and recovery of viscosity under shear, is also discussed. The document concludes by explaining the operation and calibration of common viscometers.
Newtonian fluid and Non- Newtonian fluid. PreetiMaurya22
Newtonian and non-Newtonian fluids can be classified based on their viscosity properties. Newtonian fluids have constant viscosity regardless of shear rate or stress. Non-Newtonian fluids have variable viscosity depending on factors like shear rate, stress over time, or prior deformation history. There are several types of non-Newtonian fluids including shear thinning, dilatant, Bingham plastic, thixotropic, and rheopectic fluids. Examples of non-Newtonian behaviors include ketchup becoming thinner with shaking and whipped cream increasing in viscosity over time. The document provides definitions and examples of different fluid types based on their viscosity characteristics.
This document discusses shear stress, shear rate, viscosity, and different types of fluids. It defines Newtonian fluids as having a viscosity that remains constant regardless of external stress. Non-Newtonian fluids do not follow Newton's law of viscosity and can exhibit time-dependent behavior like shear thinning, shear thickening, and thixotropy. Various rheological models are described including Bingham plastic, power law, and Maxwell models. The importance of viscosity measurement in food analysis is discussed for understanding food texture, stability, and consumer acceptability.
This document discusses rheology and viscosity. It defines rheology as the science of flow of fluids and deformation of solids under stress. Viscosity is a measure of a fluid's resistance to flow and is important in formulation of products like creams, ointments, and suspensions. The document describes different types of fluid flow based on viscosity, such as Newtonian, plastic, and pseudoplastic flow. It also discusses instruments used to measure viscosity like capillary, falling sphere, cup and bob, and cone and plate viscometers. Thixotropy, where the viscosity of a fluid decreases under shear stress over time, is also covered.
Rheology is the study of flow and deformation of materials under stress. There are two types of fluids - Newtonian fluids which follow a linear stress-strain relationship and non-Newtonian fluids which do not follow this relationship. Various types of non-Newtonian fluids exist such as plastic, pseudoplastic, dilatant, thixotropic and rheopectic fluids. Flow properties of fluids can be determined using viscometers such as capillary, rotating cylinder and cone plate viscometers. Rheology has applications in various areas including pharmaceuticals, cosmetics, food and construction materials.
The document discusses drilling fluid properties and functions, including:
- Drilling fluids are used to overcome formation pressure, stabilize boreholes, cool and lubricate bits, and transport cuttings.
- There are three basic types of drilling fluids: gas, foam, and liquid.
- Key properties that determine drilling fluid rheology include density, plastic viscosity, yield point, gel strength, and filtration properties.
- Rheological models like Bingham plastic and power law are used to characterize fluid behavior under different flow conditions.
- Proper mud circulation and flow rates must be designed to ensure effective hole cleaning and cutting transport.
This document discusses rheology, the science of deformation of matter under stress. It defines tensile and shearing stresses and explains reversible and irreversible deformations. Viscosity is introduced as the resistance of fluids to flow, with Newtonian fluids obeying the law of proportionality between stress and shear rate. Non-Newtonian fluids are divided into time-dependent categories like thixotropy and time-independent types including plastic, pseudoplastic and dilatant flows. Specific examples and rheograms are provided to illustrate different fluid behaviors.
Rheology is the science that studies the flow and deformation of matter, especially fluids and semisolids, under stress. The document discusses various rheological concepts including viscosity, Newtonian and non-Newtonian flow, plastic flow, pseudoplastic flow, dilatant flow, thixotropy, and anti-thixotropy. It provides examples of different rheological behaviors exhibited by pharmaceutical formulations like suspensions, emulsions, and gels. Various viscometers used to characterize the rheological properties of such formulations are also described.
Viscosity in newtonian and non newtonian fluidsdiarmuidbrennan
1. Viscosity is a measure of fluid resistance to shape deformation and differs between Newtonian and non-Newtonian fluids. The viscosity of non-Newtonian fluids varies with applied force over time.
2. There are several types of non-Newtonian fluids including Bingham plastics, pseudoplastics, Casson plastics, and dilatants, each with different relationships between shear stress and shear rate.
3. Formulas are provided to calculate viscous resistance, power loss, and torque for various applications like lubricated machine parts and fluid bearings. Examples are also given for problems involving immersed objects, fluid rheology, and viscous effects in bearings.
UNIT II RHEOLOGY PPT Physical Pharmaceutics IISarika184542
This document provides an overview of rheology presented by Ms. Sarika Suryawanshi. It defines rheology as the science of flow and deformation of liquids and solids. Key concepts discussed include viscosity, shear stress, shear rate, and factors that influence viscosity such as temperature, molecular weight, and electrolyte concentration. Different types of fluid flow are described including Newtonian, plastic, pseudoplastic, and dilatant. Measurement techniques for viscosity are presented, including capillary, falling sphere, and rotational viscometers. The importance of rheology in manufacturing and administration of dosage forms is highlighted.
This document provides an overview of rheology, which is the study of flow and deformation of materials. It discusses different types of fluid flow including Newtonian, plastic, pseudoplastic and dilatant flow. Key concepts covered include viscosity, shear stress, rate of shear, and factors affecting viscosity. Various rheological measurement techniques are described such as capillary viscometry, falling sphere viscometry, and rotational viscometry. The document also discusses non-Newtonian flow properties including thixotropy, hysteresis, and the Heckel equation.
8 Surprising Reasons To Meditate 40 Minutes A Day That Can Change Your Life.pptxHolistified Wellness
We’re talking about Vedic Meditation, a form of meditation that has been around for at least 5,000 years. Back then, the people who lived in the Indus Valley, now known as India and Pakistan, practised meditation as a fundamental part of daily life. This knowledge that has given us yoga and Ayurveda, was known as Veda, hence the name Vedic. And though there are some written records, the practice has been passed down verbally from generation to generation.
Muktapishti is a traditional Ayurvedic preparation made from Shoditha Mukta (Purified Pearl), is believed to help regulate thyroid function and reduce symptoms of hyperthyroidism due to its cooling and balancing properties. Clinical evidence on its efficacy remains limited, necessitating further research to validate its therapeutic benefits.
Basavarajeeyam is a Sreshta Sangraha grantha (Compiled book ), written by Neelkanta kotturu Basavaraja Virachita. It contains 25 Prakaranas, First 24 Chapters related to Rogas& 25th to Rasadravyas.
Rasamanikya is a excellent preparation in the field of Rasashastra, it is used in various Kushtha Roga, Shwasa, Vicharchika, Bhagandara, Vatarakta, and Phiranga Roga. In this article Preparation& Comparative analytical profile for both Formulationon i.e Rasamanikya prepared by Kushmanda swarasa & Churnodhaka Shodita Haratala. The study aims to provide insights into the comparative efficacy and analytical aspects of these formulations for enhanced therapeutic outcomes.
Basavarajeeyam is an important text for ayurvedic physician belonging to andhra pradehs. It is a popular compendium in various parts of our country as well as in andhra pradesh. The content of the text was presented in sanskrit and telugu language (Bilingual). One of the most famous book in ayurvedic pharmaceutics and therapeutics. This book contains 25 chapters called as prakaranas. Many rasaoushadis were explained, pioneer of dhatu druti, nadi pareeksha, mutra pareeksha etc. Belongs to the period of 15-16 century. New diseases like upadamsha, phiranga rogas are explained.
NVBDCP.pptx Nation vector borne disease control programSapna Thakur
NVBDCP was launched in 2003-2004 . Vector-Borne Disease: Disease that results from an infection transmitted to humans and other animals by blood-feeding arthropods, such as mosquitoes, ticks, and fleas. Examples of vector-borne diseases include Dengue fever, West Nile Virus, Lyme disease, and malaria.
ABDOMINAL TRAUMA in pediatrics part one.drhasanrajab
Abdominal trauma in pediatrics refers to injuries or damage to the abdominal organs in children. It can occur due to various causes such as falls, motor vehicle accidents, sports-related injuries, and physical abuse. Children are more vulnerable to abdominal trauma due to their unique anatomical and physiological characteristics. Signs and symptoms include abdominal pain, tenderness, distension, vomiting, and signs of shock. Diagnosis involves physical examination, imaging studies, and laboratory tests. Management depends on the severity and may involve conservative treatment or surgical intervention. Prevention is crucial in reducing the incidence of abdominal trauma in children.
Integrating Ayurveda into Parkinson’s Management: A Holistic ApproachAyurveda ForAll
Explore the benefits of combining Ayurveda with conventional Parkinson's treatments. Learn how a holistic approach can manage symptoms, enhance well-being, and balance body energies. Discover the steps to safely integrate Ayurvedic practices into your Parkinson’s care plan, including expert guidance on diet, herbal remedies, and lifestyle modifications.
9. Newtonian Fluids
• Viscosity of newtonian fluid remains constant while viscosity of non-
newtanian changes according to apllied shear force.
• Stress verses shear rate is linear and passing throught the origin and
proportionality constant is called as viscosity.
• E.g.Newtonian fluids-Water ,dil.solution,dil.suspension
• E.g. Non-newtaoian fluids-Ointment ,gel,colloidal dispersion,emulsion
11. • Velocity difference , dv; between two planes of liquid seeperated by
an infinitesimal distance dr,
is velocity gradient or rate of shear = dv/dr
• Force per unit area F’/A requre to bring about flow
is called as shearing stress F
• Newton says that’’ The higher the viscosity of liquid more the
shearing stress require to produce a certain rate of shear.’’
• Thus shearing stress is proprotional to rate of shear,
• F’/A ɶ dv/dr
F’/A = η dv/dr
• where the η is known as proportionality constant /coefficient of
viscosity/viscosity/dynamic viscocity.
12. • Viscosity :
Measure of the resistance to a fluid to deformation under shear stress.
Its a fluids internal resistance to flow and may be thought of as a
mesure of fluid friction.
• Unit:
Poise (Jean Louis maries poiseuille)
Define as the shearing force required to maintain a relative velocity of
1 cm / sec between two parallel planes,1 cm2 in area and 1 cm apart.
Centipoisee (cp ) 1 cp = 0.01 poise.
1 poise =100 centipoise =1 dyne sec cm -2 = 1gcm-1sec -1
13. • Slope of plot equal to the reciprocoal of viscosity, and is referred as
fluidity.
• $=1 /
$= Fluidity
η=Viscosity
η
15. • Kinematic viscosity
Absolute viscosity divided by the its density at deffinite temperature.
Kinematic viscosity= η/ρ
• Relative viscosity
Its a ratio of viscosity of viscosity of solutio to the solvent.
Relative viscosity = η/ηs
• Specific viscosity
Its relative increse in viscosity of dipersion over that of the solvent.
Specific viscosity= η- ηs / ηs
Reduce visccosity (of polymer)
Its ratio of specific viscosity to the mass canc.of the polymer.
Reduce visccosity = ηsp/c
• Intrensic viscosity(of a polymer)
Limiting value of the reduced visccosity or the intrensic viscosity at deinite dilution of polymere.
16. • Viscosity of liquid generlly increase with temperature and that of gas is decreses.
η=AeEv/RT
η = Viscosity
A = Constant depending upon mol.wt.and molar volume of liquid
Ev = Activation enegry
R = Gas constant
T = Tempertaure
17. • Flow of material such as colloidal suspension,emulsionand ointment etc.does not
follow the simple newtonian flow thus these material are know as Non-newtonian
fluids.
The fluids shows the following characteristic flow
• 1.Plastic flow
• 2.Pseudo-plastic flow
• 3.Dialtant flow
• 4.Thixotrophy
• 5.Anti thixotropic or negative thixotropic
• 6.Negative rhopexy
18. • Plastic flow fluid graph does not passs throught origin.
• It intersect the shearing stress axis at point FI .
• The extrapolation of staright line to the X axis is touches at point FB and it is a yeild value.
19. • Bingham Bodies/Plastic Material:
• Bingham yeild value-FB-Actual flow
begin.
• The slope of the rheogram is termed mobility analogues to fluidity in newtonian systems
and its reiprocal is known as plastic viscosity (U)
• (F-FB )
U = ------------
G
• U define as shearing stress in excess of the yeild value , required to induce a unit rate of
shear G.
• E.g Zinc oxide in mineral oil serves as a simple e.g of bingham body.
20.
21.
22. • Non -Linear Curve
• Passing through origin.
• The rate of shear G, doses not icreases linearly with the shearing stress,F.
• Example:Tragacanth,gelatin,carboxy methylcellulose and other water soluble
mucilage and gum.
23. • Thus viscosity does not remains constant at all point thus system is known as
shear thining system.
• Fig.4.7 shows effect of rate of shear on the viscosity of pseudoplastic materials.
• Exponential equation is given by, F N = η’ G
• More the N value greater the Pseudoplasticity characters.(N greaterr than 1)
24.
25. • Dialatancy is phenomenon in which the material exhibits an increase in resistance to
flow with increase rate of shear.
• The material returns to a state of fluidity when the sheaar is removed or the agitation is
stoped.The phenomenon is called as shear rate shickening .
• Fig.4.10 shows effect of raate of shear on the viscosity of dialatant system.
F N = η’ G
Recording #3.mp4
Recording #2.mp4
Recording #4.mp4
26.
27. • Example
1. 50% by weight of potassium silicate or fine starch powder with cold water to
whcih a deflocculaing agent may be added if necessary .
2. Titanium dioxide suspension.
28. • The non newtonian fluids like plastic ,pseudoplastic and dialatant are shows time
dependent change in the viscosity at varing shear stresses.
• This behaviour known as thixotrophy.
• Thixotrophy in plastic and pseudoplastic system:
In both type of system the viscosity is decresases upon application of shearing stress,at
given temperature.
On removal of stress it regain viscosity but after some time lag,is term as thixotrophy.
It describe as a reversible isotherm trnasformation from gel to sol.
Application of shear stress Removal of shear stress
Gel -----------------------------------> Sol----------------------------------> Gel
29.
30. Thixotrophy in dilatant system:
• In the dialatant system with increasing shearing stress an apperant viscosity is also
increases at a give temperature.Thus system known as shear thickening system.
• On removal of shear stress ,viscosity again decreases after a lag time.This
phenomenon is known as thixotrophy in dialatant system
• Describe as reversible isothermal transformation form sol to gel.
Application of shear stress Removal of shear stress
Sol -------------------------- > Gel -----------------------------------> Sol
31.
32. Irreversible thixotrophy:
On application of shearing stress breckdown of structure is therewith in the system
,which does not reform on removl of shearing stress ,or lag time is to long that from a
practical point of view the effect is irreversible.
Rheopexy:
The process of reformation of gel structure after it has been deformed can be
accelerated by applying gentle and regular movement(rolling and rocking motion).
Rolling and rocking
Sol----------------------------------->Gel
Anti-Rheopexy:
Reformation of sol state from gel state is aided by the gentle rolling or rocking
motion.
Rolling and rocking
Gel----------------------------------->Sol
33. Antithixotrophy or Negative thixotrophy:
In this there is an increase in consistancy ratherr than decrease in consistancy.
In plastic and pseudoplastic system ,viscosity first decreses after applying a shear
stress,and regain its viscosity afeter removal of stress but dowun word curve has more
viscosity than the upword curve.
Ex.Magnesium magma.
When magnesium magma is expose to increasing shear stress, the viscosity is gradually
increases.
The magma continously thickenedd at decreasing rate of shear and finally reaches a
equilibrium state (sol) ,where further cycles of increase and decrease shear rate no longer
increase consistancy of material.
34. • Anti thioxtrophy is different from dialatancy.
• Dialatncy is observe at deffloculated and ordinary conatin greater than 50 %
by volume of solid disperse phase.
• Anti thixotrophy have low solid content (1-10%) and are flocculatedd.
35. A.Capillary instrument.
1.Ostwald viscometer
2.Ubbelohde suspended level viscometer
B.Falling and rising body apparatus
1.Falling sphere viscometer
2.Rising sphere viscometer
C.Rotational viscometer.
1.Cup and bob viscometer a.Couette type b. Searle type e.g Stormer viscometer
2.Cone and plate
36.
37. • Modified form of ostwald’s viscometer.
• Third arm is attached to the bulb below the capillary part of
the right arm as shown in fig.Liquid is introduced into the
viscometerr through the left arm in quantity sufficient to fill
the bulb in the left arm.
• The viscometer is fixedd verically in thermostated bath and
allowed to attain the required temperature.
• The sample volume is adjusted and the liquid is sucked or
blown into the middle arm until the menisus is just above
the mark B.
• The suction or pressure is released and the time taken for
the bottom of the meniscus to fall from B to C is noted.
• As liquid below the capillary tube is ventilateed down by
the third arm,the volume in the middle arm ramains
constant.
38. • Principle based upon stokes law which state that when body falls from viscous
medium,it experiences resistance or viscous drag which oppose the motion of the
body.At intial stage due to gravity it experiences the acceleration but soon this
acceleration is balancedd by the viscous drag and body falls with uniform terminal
viscosity.
(p s - p 0)g
V d2 = ------------------------
18 η
Where,
V- sedimentation velocity ps-desity of disperse phase
p0-density of disperse medium η-viscosity of disperse medium
g- accelration due to gravity d -diameter of particle
40. • In-this 1.9 cm diameter stainless steel sphere is connected to strain gauge via a
platinum-rhodium wire .
• It is lifted throught the material under the test at a slow rate by a motor driverr arm.
• The shearing stress caused by the strain in the gel structure is recorded
contineously.
• Stoke equation similar to that used for falling sphere instrument.
41. It consist of two coaxial cylinder of different diameters.In to
the outer cylinder the inner cylindr (bob)is place cenrtally.
The sample is place in between two cylinder.
Then the rotation is provided to the any one of the cylinder
and then the torque set up is there.
The torque set up in the bob is measured in terms of angular
deflection Q of a pointer that moves on a scale.
Depending upon rotaion provide to which cylinder they are
classify into two group
a.Couette type viscometer
b.Searle type viscometer
42. In this type of instrument,the cup is rotated and the
viscous drag on the bob produced by the liquid
results in a torque which is proportional to the
viscosity of the liquid.
E.g.Mac michael viscometer.
43. • In this type of instrument,the bob is
rotatedd while the cup is held stationary.
• E.g Stormer viscometer
Brookfield viscometer
44. • Viscometer in which the bob rotates and the cup is stationary.The instrument can be
used to attain fundamental rheological propertied such s yield value,plastic viscosity and
the thixotropic index.
• In operation,the test system is placed in the space between the cup and the bob and
allowed to reach temperature equilibrium.A weight is placed on the hanger and the time
for the bob to rotate a specific number of times is recorded.This data is then converted
to rpm.The weights are increased gradually and the whole procedure is repeated.
• In this way,a rheogram is obtained by plotting rpm vs weight added.by thw use
appropriate constants,the rpm value can be coverted to actal rates of shear in sec -1
• Similarly , the weights added can be transposed into the units of shear stress,namely
dyne cm -2.
• The viscoty of the material may be calculated using the following eqation:
η = Kv w / v
Where. W is the weight inn grams v i is the rpm generated due to w
Kv is an intrument constant which can be determine by analysing an oil of known viscosity using the instrument.
46. Consist of flat circular plate with a wide angle cone placed centrally above it.
During operation ,the sample is placed at the centre of the plate ,which is then raidsed into
position under the cone.The cone is driven by a variable speed motor and the sample is
sheared in the narrow gap betwen the stationary plate and the rotating cone.
The rate of shear in revolution per min.is increased and decreased and the torque producd
on the cone is measured.
A plot of rpm or rate of shear versus scale reading or shearing stress may thus be
constructed in an ordinary manner.The ferranti-shirley viscometer is an example of a
rotational cone and plate viscometer.
The viscosity in poise of a newtonian liquid measured in the cone-plate viscometer is
calculated by the of the eqation:
h = C T / v
Where, C is an instrument constant ,
T is the torque reading
v is the speed of the cone in revolution per min