Lecture 13 Introduction to Convection

Lecture 13 Introduction to Convection - 1 MECE 4364 Heat...

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MECE 4364 Heat Transfer Prof. Dong Liu Department of Mechanical Engineering University of Houston 1 Lecture 13 – Oct 7, 2010 Lecture 13 Introduction to Convection 2
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Lecture 13 Flow and Thermal Considerations ± When a moving fluid comes into contact with a surface at some temperature difference ( e.g. heated surface, cold fluid) the fluid will ± transfer heat to/from the surface in a process analogous to conduction (random motion of the fluid) ± advect heat away from the point of contact by its motion (bulk motion of the fluid) ± The combined effect of these two phenomena is called convection ± Convection is governed by Newton’s Law of Cooling ± Implications: ± the “direction” of heat flux can be considered normal to the surface ± the heat transfer coefficient is related of the nature of the flow ± in order to study convection heat transfer, we must also study fluid dynamics q " = hT s T ( ) heat flux [W/m 2 ] heat transfer coefficient [W/m 2 -K] surface temperature [K] fluid temperature [K] 3 Lecture 13 Velocity Boundary Layer 4 A consequence of viscous effects associated with relative motion between a fluid and a surface.
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This note was uploaded on 01/27/2011 for the course MECE 4364 taught by Professor Lipinglui during the Winter '10 term at University of Houston.

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Lecture 13 Introduction to Convection - 1 MECE 4364 Heat...

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