Heat Transfer
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This document discusses the three main types of heat transfer: conduction, convection, and radiation. Conduction involves the transfer of heat through direct contact of molecules in solids; convection occurs through the movement of heated fluids like liquids and gases; and radiation involves the transfer of heat energy via electromagnetic waves. Metals are good conductors while non-metals are good insulators. Convection primarily happens in fluids, and the document provides an example of conduction occurring through direct contact between hands.
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Heat transfer
This document provides an overview of heat transfer and related topics including:
- The three main modes of heat transfer are conduction, convection, and radiation. Conduction involves the transfer of energy between adjacent particles. Convection involves the movement of heated fluids. Radiation involves the emission and absorption of electromagnetic waves.
- Specific heat capacity refers to the amount of energy required to change the temperature of a material by a certain amount. It varies between materials.
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This document provides an introduction to heat transfer and thermodynamics concepts. It discusses how heat transfer is related to thermodynamics and distinguishes between different forms of energy. The three main modes of heat transfer are conduction, convection and radiation. Heat is defined as the transfer of energy between two systems due to a temperature difference, and will flow from the higher temperature object to the lower temperature one. The document provides objectives and outlines concepts like thermal energy, mechanisms of heat transfer, Fourier's law of conduction and applications of heat transfer.
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This document discusses applications of heat transfer in three areas:
a) Keeping homes insulated to reduce heating and cooling costs by inhibiting heat transfer through walls. Insulation materials have high R-values which reduce the rate of heat flow.
b) Examples of heat transfer in technology include regulating temperatures in orbiting satellites, the physics of how thermos bottles keep liquids hot or cold through insulation, and how halogen cooktop stoves absorb radiant energy.
c) The greenhouse effect is a natural process that warms the Earth through the atmosphere absorbing and re-radiating solar energy trapped by greenhouse gases like carbon dioxide and methane. This summary outlines key applications and concepts related to heat transfer.
Heat transfer by convection
Convection is a mode of heat transfer between a solid surface and an adjacent moving fluid. There are two types of convection: forced convection, where an external force causes fluid motion, and natural convection, where fluid motion is caused by density differences due to temperature variations. The Nusselt, Reynolds, and Prandtl numbers are dimensionless numbers used to characterize convective heat transfer. The Nusselt number represents enhancement of heat transfer due to fluid motion. Flow can be laminar or turbulent depending on the Reynolds number. Boundary layers form near surfaces due to no-slip conditions.
Heat transfer
This document discusses the three main modes of heat transfer: conduction, convection, and radiation. Conduction involves the transfer of heat through direct contact of particles. Convection refers to the transfer of heat by the movement of fluids such as gases and liquids. Radiation involves the emission of electromagnetic waves, usually between surfaces separated by a gas or vacuum. Specific examples are provided to illustrate key concepts for each mode of heat transfer, including how conduction occurs in metals, convection currents in fluids, and radiation between the sun and earth.
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- The three main modes of heat transfer are conduction, convection, and radiation. Conduction involves the transfer of energy between adjacent particles. Convection involves the movement of heated fluids. Radiation involves the emission and absorption of electromagnetic waves.
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1. The second law of thermodynamics states that it is impossible to convert all heat into work in a cyclic process or to transfer heat from a colder to a hotter body without a net change occurring elsewhere.
2. Entropy provides a quantitative measure of disorder or randomness in a system. The total entropy of a system and its surroundings always increases according to the second law.
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This document discusses heat transfer via convection. It defines the basic types of heat transfer and distinguishes between natural and forced convection. Natural convection occurs due to density differences in a fluid caused by temperature gradients, without an external source of motion. Forced convection uses an external source like a fan or pump to enhance fluid motion and heat transfer. The document also examines factors that affect the convective heat transfer coefficient and introduces the Nusselt and Prandtl numbers in analyzing dimensional relationships of natural convection.
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This document discusses different types of boiling phenomena including pool boiling and flow boiling. It explains that pool boiling occurs when a stagnant pool of liquid is heated from below, while flow boiling occurs under bulk motion of the fluid. The document also describes the different boiling regimes that can occur during pool boiling, including nucleate boiling, boiling crisis/departure from nucleate boiling, and film boiling. It discusses bubble growth and collapse during boiling and provides diagrams to illustrate boiling heat flux versus temperature difference.
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1. What is Heat Transfer?
2. APPLICATIONS OF HEAT TRANSFER
3. MODES OF HEAT TRANSFER
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5. Fourier’s law of heat conduction
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- Heat is the transfer of energy between objects due to temperature differences and is measured in Joules.
- Temperature is determined by the motion of particles in a substance, with faster motion indicating a higher temperature.
- The three primary methods of heat transfer are conduction, convection, and radiation. Conduction involves direct contact, convection involves the transfer of heat by a liquid or gas, and radiation involves the transfer of heat through electromagnetic waves.
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Heat transfer is a discipline of thermal engineering that concerns the generation, use, conversion, and exchange of thermal energy between physical systems. Heat transfer is classified into various mechanisms, such as thermal conduction, thermal convection, thermal radiation, and transfer of energy by phase changes.
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it is informative to study to even get passing marks or for revision
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The boiling curve is presented, outlining the different boiling regimes of natural convection, nucleate boiling, transition boiling, and film boiling that occur as heat flux increases. Correlations are provided for calculating heat transfer in the nucleate and film boiling regimes.
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This document discusses heat transfer through conduction, convection and radiation. Heat transfer is the process by which thermal energy is transferred when two bodies or objects at different temperatures are brought into contact. Conduction involves the transfer of heat through direct contact of particles. Convection involves the movement of heated fluids like gases and liquids. Radiation involves the emission and transmission of electromagnetic waves that occur even in the absence of matter between the objects.
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The document discusses the three methods of heat transfer: conduction, convection, and radiation. Conduction involves the transfer of heat through direct contact of objects. Convection involves the transfer of heat by the circulation of fluids like gases and liquids. Radiation involves the transfer of heat through electromagnetic waves such as infrared radiation through space. The document provides examples of how each process transfers heat and materials that conduct or insulate heat well.
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Heat Transfer
- 1. Heat Transfer Conduction, Convection and Radiation Instructor: Kristen Adams Course: Physics 202 LFCC
- 2. Facts About Heat Transfer Heat is always transferred from HOT to COLD Heat is never transferred from COLD to HOT There are three different ways that heat is transferred: conduction, convection and radiation
- 3. Conduction Metals are good conductors of heat Non-metals are good insulators
- 4. ConductionHeat is transferred through collisions between molecules
- 5. Convection Occurs primarily in liquids and gases (fluids) Heat is transferred by movement of material
- 6. RadiationHeat is transferred by electromagnetic waves
- 7. QuestionIn the picture below are three hands, I’ll call them left, top and right.Which hand is experiencing heat transfer through-conduction ?-convection ?-radiation ?
- 8. Sources Illustration: “heat conduction in a crystal”; attributed to Cdang; some rights reserved under the CC license Attribution ShareAlike 3.0 http://commons.wikimedia.org/wiki/User:Cdang/Gallerie_d%27images/Thermodynamics_and_chemistry Illustration: “convection_cells”; attributed to theresaknott (original), Joanjoc version without text; some rights reserved under the CC license Attribution ShareAlike 3.0; commons.wikimedia.org/wiki/File:Convection_ce... Photo: the sun with prominence; public domain; http://nasaimages.org Photo: “radiation, convection, conduction”; attributed to Waifer X, some rights reserved under the CC license Attribution 2.0 Generic; http://www.flickr.com/photos/waiferx/2721036539/