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1. Liquid mercury at 0.5 kg/s is to be heated from 300 to 400 K by passing it through a 50-mm-diameter tube whose surface is maintained at 450 K. Calculate the required tube length by using an appropriate liquid metal convection heat transfer correlation. Compare your result with that which would have been obtained by using a correlation appropriate for Pr 0.7.
2. The surface of a 50-mm-diameter, thin-walled tube is maintained at 100°C. In one case air is in cross flow over the tube with a temperature of 25°C and a velocity of 30 m/s. In another case air is in fully developed flow through the tube with a temperature of 25°C and a mean velocity of 30 m/s. Compare the heat flux from the tube to the air for the two cases.
Refrigerant 134a enters a 28-cm diameter pipe steadily at 200 kPa and 200C with a velocity of 5 m/s. The refrigerant gains heat as it flows through the pipe and leaves the pipe at 180 kPa and 400C.
a disk has a mass of 4kg and a radius of 90mm it is at rest when it is placed in contact with the belt which moves with
a. do the hume-rothery rules suggest this type of solid solution behavior and discuss why or why not.b. at 1000oc what
The final pressure is 5 kpa . If specific internal energy of the gas decreases by 40 kj/kg, find the heat transfer in magnitude and direction.
steam generator tube denting is caused by rusting tube support plates which in turn is caused by acid chloride attack.
a mass of 10 tonnes is moved 20 m across the deck of an ocean vehicle of 10000 tonnes displacement. the ocean vehicle
one way to decrease the power needed to compress a gas using a compressor is to encompass the compressor in a water
Cracks propagate when the stress intensity factor exceeds a critical value and describe the fracture behaviour of the insulation tape loaded with a small crack.
Specify the proper fail-safe action for the valves in the following services. Please explain your reasons. A flammable solvent is heated by steam in a heat exchanger. The valve manipulates the flow of the steam to the exchanger
A Carnot heat engine produces power of 2.5 kW. It rejects heat to a river that is flowing at 2 kg/s, resulting in a temperature increase of 2° C. The average temperature of the river is 20° C.
Employing the ideal gas model, determine the change in specific entropy between the indicated states, in Btu/lbmol?ºR. Solve 2 ways: Use the appropriate ideal gas table AND also by using a constant specific heat value.
a converging nozzle with an exit area of 0.05 m2 is connected to a reservoir containing air with a stagnation pressure
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