Water and air are separated by a mildsteel plane wall It is

Water and air are separated by a mild-steel plane wall. It is proposed to increase the heat-transfer rate between these fluids by adding straight rectangular fins of 0.05-in. thickness and 1-in. length, spaced 0.5 in. apart. The airside and waterside heat-transfer coefficients may be assumed constant at 2 and 45 Btu/hr, ft^2, degF, respectively. What percent increase in heat transfer can be realized if fins are placed on (a) the waterside? (b) the airside? (c) both sides? In a solid circular sphere experiencing uniform volumetric heating and convection heat transfer from its surface, how does the heat flux vary with radius? How does the heat rate vary with radius? Is it possible to achieve steady-state conditions in a solid cylinder or sphere that is experiencing heat generation and whose surface is perfectly insulated? Explain. Can a material experiencing heat generation be represented by a thermal resistance and included in a circuit analysis? If so, why? If not, why not? What is the physical mechanism associated with cooking in a microwave oven? How do conditions differ from a conventional (convection or radiant) oven? Definitions: Extended surface. Fin, Fins of uniform cross section Base temperature. Fin surface area, Tip boundary condition(s), Fin effectiveness, Thin fin, Fin resistance. Fin efficiency, Bessel functions. Overall surface efficiency, Prime surface,

Solution

heat transfer is the exchange of thermal energy between physical ststems. the rate of heat transfer is depend on the temperature of the system and the properties of the intervienuing through which the heat is transferes . the three fundamental modes of the heat transfer are conduction,convection,radition heat transfer the flow of energy in the form of float is the process by which a systems internal energy is changed , hence is vital use in the applications of the foest law of thermodynamics. conduction is also known as diffusion not to be confusio with diffusion. related to mixing of consitutions of fluid.