Specify fin efficiency.

What is lumped system analysis? When is it applicable?

What is the physical significance of the Biot number? Is the Biot number more likely to be larger for highly conducting solids or poorly conducting ones?

Consider a short cylinder whose top and bottom surfaces are insulated. The cylinder is initially at a uniform temperature $T_i$ and is subjected to convection from its side surface to a medium at temperature $T_{\infty}$ with a heat transfer coefficient of $h$. Is the heat transfer in this short cylinder one- or two-dimensional? Explain.

What is the critical radius of insulation? How is it defined for a cylindrical layer?

What is the critical radius of insulation? How is it defined for a cylindrical layer?

Can the thermal resistance concept be used for a solid cylinder or sphere in steady operation? Explain.

Can the thermal resistance concept be used for a solid cylinder or sphere in steady operation? Explain.

Consider heat transfer through a windowless wall of a house on a winter day. Discuss the parameters that affect the rate of heat conduction through the wall.

Consider heat transfer through a windowless wall of a house on a winter day. Discuss the parameters that affect the rate of heat conduction through the wall.

Explain how the thermal contact resistance can be minimized.

Why are the convection and the radiation resistances at a surface in parallel instead of being in series?

What is represented by thermal contact resistance? Upon what parameters does this resistance depend?

What is the physical mechanism of heat conduction in a solid, a liquid, and a gas?