ft2arquivo2

# ft2arquivo2 - HW/Tutorial 1 WWWR Chapters 15-16 ID Chapters...

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HW/Tutorial # 1 WWWR Chapters 15-16 ID Chapters 1-2 Tutorial #1 WWWR #15.25, 15.26, 15.1, 15.2, 15.3, 16.1, 16.2. ID # 1.11, 1.13. To be discussed during the week 17 Jan. – 21 Jan. , 2011. By either volunteer or class list. HW # 1 ( Self study – solution is provided ) WWWR #15.15, 15.21, 15.22. ID # 2.2, 2.3 .

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Fundamentals of Heat Transfer Conduction , Convection , and Radiation Heat Transfer Mode Ref. ID Figure 1.1 (p 2) Heat transfer (or heat) is thermal energy in transit due to a temperature difference
Conduction Heat Transfer T k A q dx dT k A x q - = - = ; First mechanism - molecular interaction (e.g. gas) Greater motion of molecule at higher energy level (temperature) imparts energy to adjacent molecules at lower energy levels Second mechanism – by free electrons (e.g. solid)

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Thermal Conductivity Physical origins and rate equation (Ref. ID; Figure 1.2) Association of conduction heat transfer with diffusion energy due to molecular activities.
Thermal Conductivity of Gas Estimation of the thermal conductivity of gas Ref. WWWR pp202-203 (Self Study) Derived from the gas kinetic theory: (1) Considering the summation of the energy flux associated with the molecules crossing the control surface; (2) The number of molecules involved is related to average random molecular velocity. (3) κ : Boltzmann constant, d: molecular diameter, m: mass per molecule. m T d k / 3 2 5 . 1 1 κ π = [Unit = W/(m-K)]

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Thermal Conductivity of Solid Estimation of the thermal conductivity of solid Ref. WWWR pp204 (Self Study) (1) Derived from the Wiedemann, Franz, Lorenz Equation (1872). (2) The free electron mechanism of heat conduction is directly analogous
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ft2arquivo2 - HW/Tutorial 1 WWWR Chapters 15-16 ID Chapters...

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