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We assumed that, whenever fins are attached to a base material, the base temperature is unchanged.
In a particular application it is desirable to minimize the effects of the thermal contact resistance between two plane mating surfaces as shown in part
(a) Determine the VA product of a counter flow heat exchanger required for the chilling process. Determine the length of the exchanger
Hydrogen at a pressure of 2 atm flows within a tube of diameter 40 mm and wall thickness 0.5 mm. The outer surface is exposed to a gas stream
How should the control volume method be implemented at an interface between two materials with different thermal conductivities?
Hot water is transported from a cogeneration power station to commercial and industrial users through steel pipes of diameter D = 150 mm
Forced air at 25°C and 10 m/s is used to cool electronic elements mounted on a circuit board. Consider a chip of length 4 mm and width 4 mm located 120 mm
Heat is transferred at a rate of 0.1 kW through glass wool insulation (density = 100 kg/m3) of 5 cm thickness and 2 m2 area.
Heat is generated uniformly in the fuel rod of a nuclear reactor. The rod has a long, hollow cylindrical shape with its inner and outer surfaces at temperature
Ground source heat pumps operate by using a liquid rather than ambient air, as the heat source (or sink) for winter heating (or summer cooling)
Heat is transferred from water to air through a brass wall (k = 54 W/(m K)). The addition of rectangular brass fins, 0.08 cm thick and 2.5 cm long
Give an example of a practical problem in which the variation of thermal conductivity with temperature is significant
Heat is to be removed from a reaction vessel operating at 75°C by supplying water at 27°C and 0.12 kg/s through a thin-walled tube of 15-mm diameter
For a study on global warming, an electronic instrument has to be designed to map and the CO2 absorption characteristics of the Pacific Ocean.
Evaporation of liquid fuel droplets is often studied in the laboratory by using a porous sphere technique in which the fuel is supplied at a rate
Experiments to determine the local convection heat transfer coefficient for uniform flow normal to a heated circular disk have yielded a radial Nusselt number
Evaluate the Nusselt number for flow over a sphere for the following conditions
Explain under what conditions the total rate of heat transfer from an isothermal flat plate of dimensions L by 2L would be the same, independent of whether
Electrical conductors, in the form of parallel plates of length L = 40 mm, have one edge mounted to a ceramic insulated base and are spaced a distance
Estimate the rate of heat loss per unit length from a 2 in. ID, 23/8 in. OD steel pipe covered with high temperature insulation having a thermal conductivity
During a winter day, the window of a patio door with a height of 1.8 m and width of 1.0 m shows a frost line near its base
Electrical current passes through a horizontal 2-mm-diameter conductor of emissivity 0.5 when immersed in water under atmospheric pressure.
Engine oil is heated by flowing through a circular tube of diameter D = 50 mm and length L = 25 m and whose surface is maintained at 150°C.
Engine oil flows through a 25-mm-diameter tube at a rate of 0.5 kg/so The oil enters the tube at a temperature of 25°C, while the tube surface temperature
Engine oil flows at a rate of I kg/s through a 5-mm-diameter straight tube. The oil has an inlet temperature of 45°C and it is desired to heat the oil