The document discusses terminal velocity and settling of particles in fluids. It defines the equation for terminal settling velocity as a function of gravitational constant, particle and fluid densities, particle diameter, and drag coefficient. The drag coefficient is related to the particle Reynolds number, which quantifies the ratio of inertial to viscous forces on the particle. Ideal rectangular and circular settling vessels are examined in terms of retention time, critical settling velocity, and fractional particle removal. Continuous thickeners are also discussed, including solid flux analysis, mass balances, and methods for determining cross-sectional area based on underflow concentration and settling tests.
Plain sedimentation involves removing suspended solids from water through gravitational settling without the addition of chemicals. There are four types of particle settling regimes: discrete particle settling, flocculant settling, hindered settling, and compression settling. Discrete particle settling involves individual particles settling according to their size, shape, density and Stokes' Law. The design of sedimentation tanks considers factors such as flow velocity, tank capacity, inlet and outlet arrangements, and settling and sludge zones to facilitate effective particle removal.
Dimensionless number in chemical engineering Hardi Trivedi
Dimensionless number are the key parameter used in major designing parameter and understanding of the behavior of the fluid, heat and mass transfer. Heat transfer, Mass transfer and Fluid mechanics are major subject for the designing purpose also the understanding of chemical engineering and this dimensionless number are helps to determine the behavior, basic understanding of the system. In advanced software of chemical engineering, Dimensionless number play major role for the simulation , optimization of the chemical plant and their design.
Unit Operation-II (Settling and Sedimentation-1).pdfAshishSingh71810
This document discusses settling and sedimentation. It begins by defining settling and sedimentation as the separation of solid particles from a fluid via gravitational forces. It then describes the key forces involved - gravitational, buoyant, and drag forces. Various equipment for settling and sedimentation are presented, including simple gravity tanks, classifiers, and thickeners. The main theories covered include the drag coefficient, Reynolds number, and calculating terminal velocity. An example problem calculates the terminal velocity of settling oil droplets in air.
Sediment is any particulate matter that can be transported by fluid flow and eventually deposited. There are four main categories of sediments based on size: gravel, sand, silt, and clay. Incipient motion, or the initial movement of sediment particles, is important to studying sediment transport and channel design. Two main approaches to modeling incipient motion are the shear stress approach and velocity approach. Shields developed a widely used diagram relating the critical shear stress needed to initiate motion to other dimensionless parameters like particle size, fluid properties, and sediment density. White's analysis also models critical shear stress as proportional to particle size. The velocity approach uses field surveys of permissible flow velocities before sediment starts moving in different channel materials.
This document outlines the goals and topics covered in a fluid mechanics course. The course covers fluid statics, fluid flow concepts, flow of incompressible and compressible fluids, pumping systems, fluid mixing, and fluidization. Key concepts discussed include fluid properties like density, viscosity, compressibility, and pressure. Laminar and turbulent flow regimes are defined. The continuity, Bernoulli, and Reynolds equations are introduced. Example problems are provided to help understand concepts like pressure, viscosity, flow rate calculations, and fluid flow analysis.
1. Fluids differ from solids in that they cannot resist deformation and will flow under applied forces. Fluids are classified as Newtonian if shear stress is directly proportional to rate of shear strain.
2. The viscosity of a fluid represents its resistance to flow and is dependent on temperature. The boundary layer is a region near solid surfaces where viscous effects dominate due to the no-slip condition.
3. Bernoulli's equation relates pressure, velocity, and elevation for fluid flow. It states that for steady, incompressible flow, the sum of kinetic energy, potential energy, and pressure energy remains constant.
Plain sedimentation involves removing suspended solids from water through gravitational settling without the addition of chemicals. There are four types of particle settling regimes: discrete particle settling, flocculant settling, hindered settling, and compression settling. Discrete particle settling involves individual particles settling according to their size, shape, density and Stokes' Law. The design of sedimentation tanks considers factors such as flow velocity, tank capacity, inlet and outlet arrangements, and settling and sludge zones to facilitate effective particle removal.
Dimensionless number in chemical engineering Hardi Trivedi
Dimensionless number are the key parameter used in major designing parameter and understanding of the behavior of the fluid, heat and mass transfer. Heat transfer, Mass transfer and Fluid mechanics are major subject for the designing purpose also the understanding of chemical engineering and this dimensionless number are helps to determine the behavior, basic understanding of the system. In advanced software of chemical engineering, Dimensionless number play major role for the simulation , optimization of the chemical plant and their design.
Unit Operation-II (Settling and Sedimentation-1).pdfAshishSingh71810
This document discusses settling and sedimentation. It begins by defining settling and sedimentation as the separation of solid particles from a fluid via gravitational forces. It then describes the key forces involved - gravitational, buoyant, and drag forces. Various equipment for settling and sedimentation are presented, including simple gravity tanks, classifiers, and thickeners. The main theories covered include the drag coefficient, Reynolds number, and calculating terminal velocity. An example problem calculates the terminal velocity of settling oil droplets in air.
Sediment is any particulate matter that can be transported by fluid flow and eventually deposited. There are four main categories of sediments based on size: gravel, sand, silt, and clay. Incipient motion, or the initial movement of sediment particles, is important to studying sediment transport and channel design. Two main approaches to modeling incipient motion are the shear stress approach and velocity approach. Shields developed a widely used diagram relating the critical shear stress needed to initiate motion to other dimensionless parameters like particle size, fluid properties, and sediment density. White's analysis also models critical shear stress as proportional to particle size. The velocity approach uses field surveys of permissible flow velocities before sediment starts moving in different channel materials.
This document outlines the goals and topics covered in a fluid mechanics course. The course covers fluid statics, fluid flow concepts, flow of incompressible and compressible fluids, pumping systems, fluid mixing, and fluidization. Key concepts discussed include fluid properties like density, viscosity, compressibility, and pressure. Laminar and turbulent flow regimes are defined. The continuity, Bernoulli, and Reynolds equations are introduced. Example problems are provided to help understand concepts like pressure, viscosity, flow rate calculations, and fluid flow analysis.
1. Fluids differ from solids in that they cannot resist deformation and will flow under applied forces. Fluids are classified as Newtonian if shear stress is directly proportional to rate of shear strain.
2. The viscosity of a fluid represents its resistance to flow and is dependent on temperature. The boundary layer is a region near solid surfaces where viscous effects dominate due to the no-slip condition.
3. Bernoulli's equation relates pressure, velocity, and elevation for fluid flow. It states that for steady, incompressible flow, the sum of kinetic energy, potential energy, and pressure energy remains constant.
This document discusses choosing an appropriate multiphase flow model. It describes the key multiphase flow models in ANSYS Fluent including the volume of fluid (VOF) model, mixture model, Eulerian model, and discrete phase model (DPM). The document provides guidance on selecting a model based on factors like flow regime, particulate loading, phase coupling, and computational requirements.
Speaks about the different aspects of flow measurement i.e. flow types, fluid types, its units, selection parameters; definition of common terms, coanda effect coriolis effect . it also speaks about the factors affecting flow measurement.
The document discusses various aspects of viscosity including its definition, units of measurement, types of fluids, and common devices used to measure viscosity. It describes how viscosity is the resistance of a fluid to flow and is quantified by the ratio of shear stress to shear rate. Several devices are then outlined, including capillary tube viscometers, falling sphere viscometers, rotational viscometers, and vibration-based viscometers. The key methods of viscosity measurement involve measuring flow through a capillary tube, drag on a falling sphere, or torque required to rotate concentric cylinders containing the fluid.
Fluid mechanics is the study of fluids either at rest or in motion. There are two main types of fluids: liquids and gases. Liquids have strong cohesive forces that allow them to retain their shape, while gases have negligible cohesive forces and are free to expand. Fluid properties include density, viscosity, and other thermodynamic properties. Viscosity describes a fluid's resistance to flow and is dependent on factors like temperature. Reynolds number is used to characterize different flow regimes from laminar to turbulent. Fluid mechanics has many applications in fields like engineering, biology, and meteorology.
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.
This document provides a detailed table of contents for a course on transport phenomena. It outlines topics related to momentum transport and fluid dynamics including the equation of continuity, viscous stress, and momentum balances. It also covers mass transfer in reactive and non-reactive systems, including diffusion, mass transfer coefficients, and applications to reactors. Finally, it provides an overview of the first lecture which defines vectors, fluxes, and derives the equation of continuity for incompressible fluids.
This document discusses heat transfer via forced convection. It begins by outlining key topics like boundary layer thickness, skin surface coefficient, and dimensional relationships involving Reynolds and Prandtl numbers. It then discusses specific heat transfer processes like boiling and condensation. The majority of the document focuses on deriving the Blasius exact solution for laminar boundary layer flows over a flat plate through defining stream functions and solving the boundary layer equations and continuity equation to obtain the velocity profile. Key parameters like boundary layer thickness and skin friction coefficient are also defined and related to the dimensionless velocity profile.
The document discusses fluids mechanics and provides information about various fluid properties and concepts. It defines fluid, states of matter, density, viscosity, surface tension, capillarity, and vapor pressure. It also discusses fluid pressure and different types of pressure measurements including manometers, mechanical gauges, and electronic gauges. Specific devices like piezometer, U-tube manometer, differential manometer, and bourdon tube pressure gauge are explained. Course outcomes related to understanding and applying concepts of fluid statics, kinematics, dynamics, and pressure measurements are also listed.
This document discusses rheology, which is defined as the science dealing with the flow and deformation of materials under stress. It provides definitions of key rheological terms like viscosity and describes different flow patterns such as Newtonian, plastic, pseudoplastic and dilatant flow. Specific techniques for determining viscosity are outlined, including capillary viscometry, falling sphere viscometry, cup and bob viscometry, and cone and plate viscometry.
The document discusses fluid mechanics concepts relevant to power generation, including:
1. It describes Lagrangian and Eulerian approaches to analyzing velocity fields in fluids, with the Eulerian approach being more useful as it focuses on velocity at fixed points rather than tracking individual particles.
2. Conservation laws for mass, momentum and energy are presented using the control volume approach, with the Reynolds Transport Theorem relating changes in an extensive property within a control volume to flux of that property across its boundaries.
3. Complex flows encountered in power generation equipment are classified, with turbulent internal pipe flows and external flows around bodies requiring both viscous and inviscid analyses highlighted.
Sedimentology is concerned with the study of sediments and sedimentary rocks. Stokes' Law is a formula that determines the rate of sedimentation by calculating the terminal velocity that a particle will reach as it moves through a viscous liquid. This law states that a particle will attain a constant velocity based on factors like its diameter, density difference with the fluid, fluid viscosity, and gravity. There are three common methods used to measure sedimentation rates: the Atterberg cylinder method, pippete method, and sedimentation balance method.
This document provides information about a fluid mechanics course taught by Dr. Muhammad Uzair at NED University of Engineering & Technology. The course objectives are to impart theoretical knowledge of fluid statics and dynamics and enable students to analyze and solve engineering problems. The course learning outcomes include being able to define fluid mechanics concepts, apply equations to solve problems, and analyze dimensional analysis and experimental work problems. The course will cover topics such as fluid properties, fluid statics, fluid dynamics, and dimensional analysis over its contents. Student learning will be assessed through exams, assignments, reports, and quizzes.
This document discusses different types and design considerations for sedimentation processes used in water and wastewater treatment to remove solids via gravity settling. It describes four types of settling (discrete, flocculent, zone, and compression) and compares design parameters for discrete and flocculent settling. The document outlines batch settling tests and analyses, including determining zone settling velocity and its relationship to solids concentration. It provides details on designing zone settling tanks, including mass balances and limiting flux analyses to size tanks and select operating parameters like underflow rate.
Understand the physical mechanism of convection and its classification.
Visualize the development of velocity and thermal boundary layers during flow over surfaces.
Gain a working knowledge of the dimensionless Reynolds, Prandtl, and Nusselt numbers.
Distinguish between laminar and turbulent flows, and gain an understanding of the mechanisms of momentum and heat transfer in turbulent flow.
Derive the differential equations that govern convection on the basis of mass, momentum, and energy balances, and solve these equations for some simple cases such as laminar flow over a flat plate.
Non dimensionalize the convection equations and obtain the functional forms of friction and heat transfer coefficients.
Use analogies between momentum and heat transfer, and determine heat transfer coefficient from knowledge of friction coefficient.
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.
Chromatography is a laboratory technique used to separate mixtures. It works by distributing components between two phases, such as gas and liquid or liquid and solid. The document discusses the history and principles of chromatography. It defines key terms like mobile phase, stationary phase, retention time, and resolution. It also describes different types of chromatography techniques including liquid-solid, liquid-liquid, ion exchange, gel permeation, and affinity chromatography. Common chromatography methods like paper chromatography, thin layer chromatography, gas chromatography, high performance liquid chromatography, and gas chromatography-mass spectrometry are also outlined.
multiphase flow modeling and simulation ,Pouriya Niknam , UNIFIPouriya Niknam
This document discusses modeling and simulation of multiphase flows using computational fluid dynamics (CFD). It begins with definitions of multiphase flow and discusses important types including bubbly, droplet, particle-laden, and annular flows. The document then provides tips on multiphase simulation including choosing appropriate modeling approaches such as Lagrangian, Eulerian, or volume of fluid methods depending on the problem. It concludes with discussions of challenges such as convergence difficulties and appropriate solver settings and techniques to address these challenges.
This document discusses the principles and terms of chromatographic techniques. It begins by explaining the origin of chromatography from the early 1900s work of Russian botanist Mikhail Semyonoyich Tsvet. It then defines key chromatography terms like mobile phase, stationary phase, chromatogram, and retention factor. The document also explains different types of chromatography like liquid-solid, liquid-liquid, ion exchange, and affinity chromatography. It discusses factors that influence separation like capacity factor, column efficiency, and resolution. Finally, it provides examples of common chromatography techniques like paper chromatography, thin layer chromatography, gas-liquid chromatography, and high performance liquid chromatography.
This document provides information about a fluid mechanics course taught at Sanjivani College of Engineering. It includes:
- An introduction to fluid properties and the differences between solids, liquids, and gases
- Definitions of fluids and their ability to continuously deform under applied shear stress
- Details about fluid kinematics, dynamics, and statics as branches of fluid mechanics
- Explanations of key fluid properties like density, viscosity, and surface tension along with relevant formulas
- Examples of areas where fluid mechanics is applied, such as mechanical engineering, civil engineering, and more
This document provides an introduction to key concepts in fluid mechanics. It begins by outlining the objectives of understanding basic fluid mechanics concepts. It then discusses various fluid flow types and conditions like laminar versus turbulent flow, compressible versus incompressible flow, and internal versus external flow. Key concepts like viscosity, vapor pressure, cavitation, surface tension, and capillary effects are also introduced. Equations for hydrostatic forces on submerged surfaces are provided. In summary, the document serves as an overview of fundamental fluid mechanics topics.
This document discusses choosing an appropriate multiphase flow model. It describes the key multiphase flow models in ANSYS Fluent including the volume of fluid (VOF) model, mixture model, Eulerian model, and discrete phase model (DPM). The document provides guidance on selecting a model based on factors like flow regime, particulate loading, phase coupling, and computational requirements.
Speaks about the different aspects of flow measurement i.e. flow types, fluid types, its units, selection parameters; definition of common terms, coanda effect coriolis effect . it also speaks about the factors affecting flow measurement.
The document discusses various aspects of viscosity including its definition, units of measurement, types of fluids, and common devices used to measure viscosity. It describes how viscosity is the resistance of a fluid to flow and is quantified by the ratio of shear stress to shear rate. Several devices are then outlined, including capillary tube viscometers, falling sphere viscometers, rotational viscometers, and vibration-based viscometers. The key methods of viscosity measurement involve measuring flow through a capillary tube, drag on a falling sphere, or torque required to rotate concentric cylinders containing the fluid.
Fluid mechanics is the study of fluids either at rest or in motion. There are two main types of fluids: liquids and gases. Liquids have strong cohesive forces that allow them to retain their shape, while gases have negligible cohesive forces and are free to expand. Fluid properties include density, viscosity, and other thermodynamic properties. Viscosity describes a fluid's resistance to flow and is dependent on factors like temperature. Reynolds number is used to characterize different flow regimes from laminar to turbulent. Fluid mechanics has many applications in fields like engineering, biology, and meteorology.
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.
This document provides a detailed table of contents for a course on transport phenomena. It outlines topics related to momentum transport and fluid dynamics including the equation of continuity, viscous stress, and momentum balances. It also covers mass transfer in reactive and non-reactive systems, including diffusion, mass transfer coefficients, and applications to reactors. Finally, it provides an overview of the first lecture which defines vectors, fluxes, and derives the equation of continuity for incompressible fluids.
This document discusses heat transfer via forced convection. It begins by outlining key topics like boundary layer thickness, skin surface coefficient, and dimensional relationships involving Reynolds and Prandtl numbers. It then discusses specific heat transfer processes like boiling and condensation. The majority of the document focuses on deriving the Blasius exact solution for laminar boundary layer flows over a flat plate through defining stream functions and solving the boundary layer equations and continuity equation to obtain the velocity profile. Key parameters like boundary layer thickness and skin friction coefficient are also defined and related to the dimensionless velocity profile.
The document discusses fluids mechanics and provides information about various fluid properties and concepts. It defines fluid, states of matter, density, viscosity, surface tension, capillarity, and vapor pressure. It also discusses fluid pressure and different types of pressure measurements including manometers, mechanical gauges, and electronic gauges. Specific devices like piezometer, U-tube manometer, differential manometer, and bourdon tube pressure gauge are explained. Course outcomes related to understanding and applying concepts of fluid statics, kinematics, dynamics, and pressure measurements are also listed.
This document discusses rheology, which is defined as the science dealing with the flow and deformation of materials under stress. It provides definitions of key rheological terms like viscosity and describes different flow patterns such as Newtonian, plastic, pseudoplastic and dilatant flow. Specific techniques for determining viscosity are outlined, including capillary viscometry, falling sphere viscometry, cup and bob viscometry, and cone and plate viscometry.
The document discusses fluid mechanics concepts relevant to power generation, including:
1. It describes Lagrangian and Eulerian approaches to analyzing velocity fields in fluids, with the Eulerian approach being more useful as it focuses on velocity at fixed points rather than tracking individual particles.
2. Conservation laws for mass, momentum and energy are presented using the control volume approach, with the Reynolds Transport Theorem relating changes in an extensive property within a control volume to flux of that property across its boundaries.
3. Complex flows encountered in power generation equipment are classified, with turbulent internal pipe flows and external flows around bodies requiring both viscous and inviscid analyses highlighted.
Sedimentology is concerned with the study of sediments and sedimentary rocks. Stokes' Law is a formula that determines the rate of sedimentation by calculating the terminal velocity that a particle will reach as it moves through a viscous liquid. This law states that a particle will attain a constant velocity based on factors like its diameter, density difference with the fluid, fluid viscosity, and gravity. There are three common methods used to measure sedimentation rates: the Atterberg cylinder method, pippete method, and sedimentation balance method.
This document provides information about a fluid mechanics course taught by Dr. Muhammad Uzair at NED University of Engineering & Technology. The course objectives are to impart theoretical knowledge of fluid statics and dynamics and enable students to analyze and solve engineering problems. The course learning outcomes include being able to define fluid mechanics concepts, apply equations to solve problems, and analyze dimensional analysis and experimental work problems. The course will cover topics such as fluid properties, fluid statics, fluid dynamics, and dimensional analysis over its contents. Student learning will be assessed through exams, assignments, reports, and quizzes.
This document discusses different types and design considerations for sedimentation processes used in water and wastewater treatment to remove solids via gravity settling. It describes four types of settling (discrete, flocculent, zone, and compression) and compares design parameters for discrete and flocculent settling. The document outlines batch settling tests and analyses, including determining zone settling velocity and its relationship to solids concentration. It provides details on designing zone settling tanks, including mass balances and limiting flux analyses to size tanks and select operating parameters like underflow rate.
Understand the physical mechanism of convection and its classification.
Visualize the development of velocity and thermal boundary layers during flow over surfaces.
Gain a working knowledge of the dimensionless Reynolds, Prandtl, and Nusselt numbers.
Distinguish between laminar and turbulent flows, and gain an understanding of the mechanisms of momentum and heat transfer in turbulent flow.
Derive the differential equations that govern convection on the basis of mass, momentum, and energy balances, and solve these equations for some simple cases such as laminar flow over a flat plate.
Non dimensionalize the convection equations and obtain the functional forms of friction and heat transfer coefficients.
Use analogies between momentum and heat transfer, and determine heat transfer coefficient from knowledge of friction coefficient.
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.
Chromatography is a laboratory technique used to separate mixtures. It works by distributing components between two phases, such as gas and liquid or liquid and solid. The document discusses the history and principles of chromatography. It defines key terms like mobile phase, stationary phase, retention time, and resolution. It also describes different types of chromatography techniques including liquid-solid, liquid-liquid, ion exchange, gel permeation, and affinity chromatography. Common chromatography methods like paper chromatography, thin layer chromatography, gas chromatography, high performance liquid chromatography, and gas chromatography-mass spectrometry are also outlined.
multiphase flow modeling and simulation ,Pouriya Niknam , UNIFIPouriya Niknam
This document discusses modeling and simulation of multiphase flows using computational fluid dynamics (CFD). It begins with definitions of multiphase flow and discusses important types including bubbly, droplet, particle-laden, and annular flows. The document then provides tips on multiphase simulation including choosing appropriate modeling approaches such as Lagrangian, Eulerian, or volume of fluid methods depending on the problem. It concludes with discussions of challenges such as convergence difficulties and appropriate solver settings and techniques to address these challenges.
This document discusses the principles and terms of chromatographic techniques. It begins by explaining the origin of chromatography from the early 1900s work of Russian botanist Mikhail Semyonoyich Tsvet. It then defines key chromatography terms like mobile phase, stationary phase, chromatogram, and retention factor. The document also explains different types of chromatography like liquid-solid, liquid-liquid, ion exchange, and affinity chromatography. It discusses factors that influence separation like capacity factor, column efficiency, and resolution. Finally, it provides examples of common chromatography techniques like paper chromatography, thin layer chromatography, gas-liquid chromatography, and high performance liquid chromatography.
This document provides information about a fluid mechanics course taught at Sanjivani College of Engineering. It includes:
- An introduction to fluid properties and the differences between solids, liquids, and gases
- Definitions of fluids and their ability to continuously deform under applied shear stress
- Details about fluid kinematics, dynamics, and statics as branches of fluid mechanics
- Explanations of key fluid properties like density, viscosity, and surface tension along with relevant formulas
- Examples of areas where fluid mechanics is applied, such as mechanical engineering, civil engineering, and more
This document provides an introduction to key concepts in fluid mechanics. It begins by outlining the objectives of understanding basic fluid mechanics concepts. It then discusses various fluid flow types and conditions like laminar versus turbulent flow, compressible versus incompressible flow, and internal versus external flow. Key concepts like viscosity, vapor pressure, cavitation, surface tension, and capillary effects are also introduced. Equations for hydrostatic forces on submerged surfaces are provided. In summary, the document serves as an overview of fundamental fluid mechanics topics.
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2. Terminal Velocity of Settling Particle
Rate at which discrete particles settle in a fluid at constant temperature
is given by Newton’s equation:
vs = [(4g(s - )dp) / (3Cd )] 0.5
where
vs = terminal settling velocity (m/s)
g = gravitational constant (m/s2)
s = density of the particle (kg/m3)
= density of the fluid (kg/m3)
dp = particle diameter (m)
Cd = Drag Coefficient (dimensionless)
The terminal settling velocity is derived by balancing drag, buoyant,
and gravitational forces that act on the particle.
3. Reynolds Number
In fluid mechanics, the Reynolds Number, Re (or NR), is a dimensionless
number that is the ratio of inertial forces to viscous forces.
It quantifies the relative importance of these two types of forces for a
given set of flow conditions.
where:
v = mean velocity of an object relative to a fluid (m/s)
L = characteristic dimension, (length of fluid; particle diameter) (m)
μ = dynamic viscosity of fluid (kg/(m·s))
ν = kinematic viscosity (ν = μ/ρ) (m²/s)
ρ = fluid density (kg/m³)
4. Drag Coefficient and Reynolds Number
Cd is determined from Stokes Law which relates drag to Reynolds Number
5. Drag Coefficient and Reynolds Number
Cd is determined from Stokes Law which relates drag to Reynolds Number
6. Drag Coefficient and Reynolds Number
Cd is determined from Stokes Law which relates drag to Reynolds Number
7. Drag Coefficient and Reynolds Number
Cd is determined from Stokes Law which relates drag to Reynolds Number
8. Drag Coefficient and Reynolds Number
Cd is determined from Stokes Law which relates drag to Reynolds Number
9. Drag Coefficient and Reynolds Number
Cd is determined from Stokes Law which relates drag to Reynolds Number
10. Terminal Velocity of Settling Particle
Terminal velocity is affected by:
Temperature
Fluid Density
Particle Density
Particle Size
Particle Shape
Degree of Turbulence
Volume fraction of solids
Solid surface charge and pulp chemistry
Magnetic and electric field strength
Vertical velocity of fluid
18. Terminal Velocity under
Hindered Settling Conditions
McGhee’s (1991) equation estimates velocity for spherical
particles under hindered settling conditions for Re < 0.3:
Vh/V = (1 - Cv)4.65
where
Vh = hindered settling velocity
V = free settling velocity
Cv = volume fraction of solid particles
For Re > 1,000, the exponent is only 2.33
McGhee, T.J., 1991. Water Resources and Environmental Engineering. Sixth Edition. McGraw-Hill, New York.
19. Terminal Velocity under
Hindered Settling Conditions
McGhee, T.J., 1991. Water Resources and Environmental Engineering. Sixth Edition. McGraw-Hill, New York.
23. Ideal Rectangular Settling Vessel
Model Assumptions
1. Homogeneous feed is distributed uniformly over tank cross-
sectional area
2. Liquid in settling zone moves in plug flow at constant velocity
3. Particles settle according to Type I settling (free settling)
4. Particles are small enough to settle according to Stoke's Law
5. When particles enter sludge region, they exit the suspension
24. Ideal Rectangular Settling Vessel
Side view
u = average (constant) velocity of fluid flowing across vessel
vs = settling velocity of a particular particle
vo = critical settling velocity of finest particle recovered at 100%
25. Retention Time
Average time spent in the vessel by an element
of the suspension
and W, H, L are the vessel dimensions;
u is the constant velocity
26. Critical Settling Velocity
If to is the residence time of liquid in the tank, then all
particles with a settling velocity equal to or greater
than the critical settling velocity, vo, will settle out at
or prior to to, i.e.,
So all particles with a settling velocity equal to or greater
than v0 will be separated in the tank from the fluid
27. Critical Settling Velocity
Note: this expression for vo has no H term. This defines the
overflow rate or surface-loading rate
- Key parameter to design ideal Type I settling clarifiers
- Cross-sectional area A is calculated to get desired v0
Since
30. Ideal Circular Settling Vessel
In an interval dt, a particle having a diameter below do
will have moved vertically and horizontally as follows:
For particles with a diameter dx (below do),
the fractional removal is given by:
40. Continuous Thickener (Type III)
Bulk Velocity
where
ub = bulk velocity of slurry
Qu = volumetric flow rate of thickener underflow
A = Surface area of thickener
44. Thickener Cross-Sectional Area
Talmadge – Fitch Method
- Obtain settling rate data from experiment (determine
interface height of settling solids (H) vs. time (t)
- Construct curve of H vs. t
- Determine point where hindered settling changes to
compression settling
- intersection of tangents
- construct a bisecting line through this point
- draw tangent to curve where bisecting line intersects the curve
45. Thickener Cross-Sectional Area
Talmadge – Fitch Method
- Draw horizontal line for H = Hu that corresponds to the
underflow concentration Xu, where
- Determine tu by drawing vertical line at point where
horizontal line at Hu intersects the bisecting tangent line
46. Thickener Cross-Sectional Area
Talmadge – Fitch Method
- Obtain cross-sectional area required from:
- Compute the minimum area of the clarifying section
using a particle settling velocity of the settling velocity
at t = 0 in the column test.
- Choose the largest of these two values
47. Thickener Cross-Sectional Area
Coe – Clevenger Method
- Developed in 1916 and still in use today:
where
A = cross-sectional area (m2)
F = feed pulp liquid/solids ratio
L = underflow pulp liquid/solid ratio
ρs = solids density (g/cm3)
Vm = settling velocity (m/hr)
dw/dt = dry solids production rate (g/hr)
48. Thickener Depth and Residece Time
- Equations describing solids settling do not include tank
depth. So it is determined arbitrarily by the designer
- Specifying depth is equivalent to specifying residence
time for a given flow rate and cross-sectional area
- In practice, residence time is of the order of 1-2 hours
to reduce impact of non-ideal behaviour
50. Type II Settling (flocculant)
- Coalescence of particles occurs during settling (large
particles with high velocities overtake small particles
with low velocities)
- Collision frequency proportional to solids concentration
- Collision frequency proportional to level of turbulence
(but too high an intensity will promote break-up)
- Cumulative number of collisions increases with time
51. Type II Settling (flocculant)
- Particle agglomerates have higher settling velocities
- Rate of particle settling increases with time
- Longer residence times and deeper tanks promote
coalescence
- Fractional removal is function of overflow rate and
residence time.
- With Type I settling, only overflow rate is significant
52. Primary Thickener Design
- Typical design is for Type II characteristics
- Underflow densities are typically 50-65% solids
- Safety factors are applied to reduce effect of
uncertainties regarding flocculant settling velocities
• 1.5 to 2.0 x calculated retention time
• 0.6 to 0.8 x surface loading (overflow rate)
53. Primary Thickener Design
Non-ideal conditions
• Turbulence
• Hydraulic short-circuiting
• Bottom scouring velocity (re-suspension)
All cause shorter residence time of fluid and/or particles
54. Primary Thickener Design Parameters
Depth (m) 3 - 5 m
Diameter (m) 3 - 170 m
Bottom Slope 0.06 to 0.16 (3.5° to 10°)
Rotation Speed
of rake arm 0.02 - 0.05 rpm
55. Hindered (or Zone) Settling (Type III)
- solids concentration is high such that particle interactions
are significant
- cohesive forces are so strong that movement of particles
is restricted
- particles settle together establishing a distinct interface
between clarified fluid and settling particles
56. Compression Settling (Type IV)
- When solids density is very high, particles provide partial
mechanical support for those above
- particles undergo mechanical compression as they settle
- Type IV settling is extremely slow (measured in days)