Questions from Principles Of Heat Transfer


Q: Atmospheric air at 10°C enters a 2-m-

Atmospheric air at 10°C enters a 2-m-long smooth, rectangular duct with a 7.5-cm * 15-cm cross section. The mass flow rate of the air is 0.1 kg/s. If the sides are at 150°C, estimate (a) the heat tra...

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Q: Water enters a small copper tube, with an inner diameter of

Water enters a small copper tube, with an inner diameter of 2.5 cm, at the rate of 0.025 kg/s and a temperature of 15°C. Steam is condensing on the outer surface of the tube at atmospheric pressure so...

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Q: Determine the heat transfer coefficient for liquid bismuth flowing through an annulus

Determine the heat transfer coefficient for liquid bismuth flowing through an annulus (5-cm-ID, 6.1-cm- OD) at a velocity of 4.5 m/s. The wall temperature of the inner surface is 427°C, and the bismut...

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Q: Mercury flows inside a copper tube 9 m long with a 5

Mercury flows inside a copper tube 9 m long with a 5.1-cm inside diameter at an average velocity of 7 m/s. The temperature at the inside surface of the tube is 38°C uniformly throughout the tube, and...

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Q: A heat exchanger is to be designed to heat a flow of

A heat exchanger is to be designed to heat a flow of molten bismuth from 377°C to 477°C. The heat exchanger consists of a 50-mm-ID tube with a sur- face temperature maintained uniformly at 500°C by an...

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Q: A heat exchanger wall consists of a copper plate 2 cm thick

A heat exchanger wall consists of a copper plate 2 cm thick. The heat transfer coefficients on the two sides of the plate are 2700 and 7000 W/ ( m2 K ) , corresponding to fluid temperatures of 92 and...

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Q: Liquid sodium is to be heated from 500 K to 600 K

Liquid sodium is to be heated from 500 K to 600 K by passing it at a flow rate of 5.0 kg/s through a 5-cm- ID tube whose surface is maintained at 620 K. What length of tube is required?

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Q: For fully turbulent flow in a long tube of diameter D,

For fully turbulent flow in a long tube of diameter D, develop a relation between the ratio /in terms of flow and heat transfer parameters, where /is the tube length required to raise the bulk temper...

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Q: A 2.54-cm-OD, 1.9

A 2.54-cm-OD, 1.9-cm-ID steel pipe carries dry air at a velocity of 7.6 m/s and a temperature of 27°C. Ambient air is at 21°C and has a dew point of 10°C. How much ins...

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Q: A double-pipe heat exchanger is used to condense steam at

A double-pipe heat exchanger is used to condense steam at 7370 N/m2. Water at an average bulk temperature of 10°C flows at 3.0 m/s through the inner pipe, which is made of copper and has a 2.54-cm ID...

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