Lecture 8 Review I - 1 MECE 4364 Heat Transfer Prof Dong Liu Department of Mechanical Engineering University of Houston Lecture 8 Lecture 8 2

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MECE 4364 Heat Transfer Prof. Dong Liu Department of Mechanical Engineering University of Houston 1 Lecture 8 – Sep 16, 2010 Lecture 8 Review 2
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Lecture 8 Heat Transfer Modes k (W/m K) h (W/m 2 K) ε Diffusion of energy due to random molecular motion Diffusion of energy due to random molecular motion plus energy transfer due to bulk motion (advection) Energy transfer by electromagnetic waves Conduction Convection Radiation Transport Property or Coefficient Rate Equation Mechanisms Mode 3 ' x dT qk dx =− ( ) '' s qh TT ( ) ' 4 4 s sat qT T εσ Lecture 8 Conservation of Energy ± Define ± E: the sum of thermal and mechanical energy ± E st : thermal and mechanical energy stored in the control volume ± Δ E st : the change in thermal and mechanical energy stored over time interval Δ t ± E in : thermal and mechanical energy entering the control volume ± E out : thermal and mechanical energy leaving the control volume 4 in E ± out E ± g E ± st E ± st s ti n o u t g dE EE E E dt =− + ±± ± ± in g out st EEE E +− = Δ Control volume in E out E g E st E Δ Control volume
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Lecture 8 General Methodology ± Procedures ± Define appropriate control volume and draw the control surface ± Identify appropriate time basis (t or Δ t) ± Identify relevant energy processes , and show each process on the control volume by an appropriately labeled arrow ± Write the conservation equation
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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 8 Review I - 1 MECE 4364 Heat Transfer Prof Dong Liu Department of Mechanical Engineering University of Houston Lecture 8 Lecture 8 2

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