CFDa.7.heatxfer

CFDa.7.heatxfer - Fluids Review TRN-1998-004 Heat Transfer:...

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© Fluent Inc. 12/05/10 G1 Fluids Review TRN-1998-004 Heat Transfer: An Introduction
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© Fluent Inc. 12/05/10 G2 Fluids Review TRN-1998-004 Outline Introduction Modes of heat transfer Typical design problems Coupling of fluid flow and heat transfer Conduction Convection Radiation
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© Fluent Inc. 12/05/10 G3 Fluids Review TRN-1998-004 Introduction Heat transfer is the study of thermal energy (heat) flows Heat always flows from “hot” to “cold” Examples are ubiquitous: heat flows in the body home heating/cooling systems refrigerators, ovens, other appliances automobiles, power plants, the sun, etc.
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© Fluent Inc. 12/05/10 G4 Fluids Review TRN-1998-004 Modes of Heat Transfer Conduction - diffusion of heat due to temperature gradient Convection - when heat is carried away by moving fluid Radiation - emission of energy by electromagnetic waves q convection q q radiation
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© Fluent Inc. 12/05/10 G5 Fluids Review TRN-1998-004 Typical Design Problems To determine: overall heat transfer coefficient - e.g., for a car radiator highest (or lowest) temperature in a system - e.g., in a gas turbine temperature distribution (related to thermal stress) - e.g., in the walls of a spacecraft temperature response in time dependent heating/cooling problems - e.g., how long does it take to cool down a case of soda?
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© Fluent Inc. 12/05/10 G6 Fluids Review TRN-1998-004 Heat Transfer and Fluid Flow As a fluid moves, it carries heat with it -- this is called convection Thus, heat transfer can be tightly coupled to the fluid flow solution Additionally: The rate of heat transfer is a strong function of fluid velocity Fluid properties may be strong functions of temperature (e.g., air)
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© Fluent Inc. 12/05/10 G7 Fluids Review TRN-1998-004 Conduction Heat Transfer Conduction is the transfer of heat by molecular interaction In a gas, molecular velocity depends on temperature hot, energetic molecules collide with neighbors, increasing their speed In solids, the molecules and the lattice structure vibrate
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© Fluent Inc. 12/05/10 G8 Fluids Review TRN-1998-004 Fourier’s Law “heat flux is proportional to temperature gradient” where k
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This note was uploaded on 12/04/2010 for the course M MM4CFD taught by Professor N/a during the Fall '10 term at Uni. Nottingham.

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CFDa.7.heatxfer - Fluids Review TRN-1998-004 Heat Transfer:...

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