(a) Define thermal conductivity and explain its significance in heat transfer. (3) (b) Discuss the physical mechanism of

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A Define Thermal Conductivity And Explain Its Significance In Heat Transfer 3 B Discuss The Physical Mechanism Of 1 (331.92 KiB) Viewed 46 times

(a) Define thermal conductivity and explain its significance in heat transfer. (3) (b) Discuss the physical mechanism of heat conduction in a solid, a liquid, and a gas (3) (c) Write down the one-dimensional steady-state heat conduction equation for with constant thermal conductivity and heat generation in its simplest form, and indicate what each variable represents for the following: (i) a plane wall (3) (ii) a long cylinder (3) (d) Define and state the physical significance of the Nusselt number (3) (e) Explain the physical significance of the Prandtl number and indicate if its value depends on the type of flow or the flow geometry. (3) (f) Define Reynolds number and explain its physical significance (2) (g) Define emissivity and state its range. (2) (h) What is a blackbody? How do real bodies differ from blackbodies? (2) (i) Write down the expressions for the physical laws that govern each mode of heat transfer, and identify the variables involved in each relation. (6) [30] TISTI 2