Questions from Principles Of Heat Transfer

Q: A long, 2-cm-diameter horizontal copper pipe carries

A long, 2-cm-diameter horizontal copper pipe carries dry saturated steam at 120 kPa absolute pressure. The pipe is contained within an environmental testing chamber in which the ambient air pressure c...

Q: Compare the rate of condensate flow from the pipe in Problem 8

Compare the rate of condensate flow from the pipe in Problem 8.28 ( air pressure = 200 kPa) with that for a 3.89-cm-OD pipe and 200 kPa air pressure. What is the rate of condensate flow if the 2-cm...

Q: Using standard steam tables, calculate the coefficient of thermal expansion,

Using standard steam tables, calculate the coefficient of thermal expansion, , from its definition for steam at 450°C and pressures of 10 kPa and 1 MPa. Then compare your results with the value obtai...

Q: A thermocouple (0.8-mm OD) is located

A thermocouple (0.8-mm OD) is located horizon- tally in a large enclosure whose walls are at 37°C. The enclosure is filled with a transparent, quiescent gas that has the same properties as air. The e...

Q: A sphere 20 cm in diameter containing liquid air (-140°

A sphere 20 cm in diameter containing liquid air (-140°C) is covered with 5-cm-thick glass wool (50 kg/m3 density) with an emissivity of 0.8. Estimate the rate of heat transfer to the liquid air...

Q: Only 10% of the energy dissipated by the tungsten filament of

Only 10% of the energy dissipated by the tungsten filament of an incandescent lamp is in the form of useful visible light. Consider a 100-W lamp with a 10-cm spherical glass bulb, as shown in the sket...

Q: A 2-cm-diameter bare aluminum electric power trans-

A 2-cm-diameter bare aluminum electric power trans- mission line with an emissivity of 0.07 carries 500 A at 400 kV. The wire has an electrical resistivity of 1.72 / and is suspended horizontally betw...

Q: An 20-cm-diameter horizontal steam pipe carries 1.

An 20-cm-diameter horizontal steam pipe carries 1.66 kg/min of dry, pressurized, saturated steam at 120°C. If the ambient air temperature is 20°C, deter- mine the rate of condensate flow at the en...

Q: A long steel rod (2 cm in diameter, 2 m

A long steel rod (2 cm in diameter, 2 m long) has been heat treated and quenched to a temperature of 100°C in an oil bath. To cool the rod further, it is necessary to remove it from the bath and expos...

Q: In petroleum processing plants, it is often necessary to pump highly

In petroleum processing plants, it is often necessary to pump highly viscous liquids such as asphalt through pipes. To keep pumping costs within reason, the pipelines are electrically heated to reduc...