Q: Compute the average heat transfer coefficient hc for 10°C water
Compute the average heat transfer coefficient hc for 10°C water flowing at 4 m/s in a long, 2.5-cm-ID pipe (surface temperature 40°C) using three different equations. Compare your results. Also determ...
See AnswerQ: Water at 80°C is flowing through a thin copper tube
Water at 80°C is flowing through a thin copper tube (15.2-cm-ID) at a velocity of 7.6 m/s. The duct is located in a room at 15°C, and the heat transfer coefficient at the outer surface of the...
See AnswerQ: On a cold winter day, the outside wall of a home
On a cold winter day, the outside wall of a home is exposed to an air temperature of 22°C when the inside temperature of the room is at 22°C. As a result of this temperature gradient, there is heat lo...
See AnswerQ: Mercury at an inlet bulk temperature of 90°C flows through
Mercury at an inlet bulk temperature of 90°C flows through a 1.2-cm-ID tube at a flow rate of 4535 kg/h. This tube is part of a nuclear reactor in which heat can be generated uniformly at any desired...
See AnswerQ: Exhaust gases having properties similar to dry air enter a thin-
Exhaust gases having properties similar to dry air enter a thin-walled cylindrical exhaust stack at 800 K. The stack is made of steel and is 8 m tall with a 0.5-m inside diameter. If the gas flow rate...
See AnswerQ: Water at an average temperature of 27°C is flowing through
Water at an average temperature of 27°C is flowing through a smooth 5.08-cm-ID pipe at a velocity of 0.91 m/s. If the temperature at the inner surface of the pipe is 49°C, determine (a) the heat tran...
See AnswerQ: An aniline-alcohol solution is flowing at a velocity of 3
An aniline-alcohol solution is flowing at a velocity of 3 m/s through a long, 2.5-cm-ID thin-wall tube. Steam is condensing at atmospheric pressure on the outer surface of the tube, and the tube wall...
See AnswerQ: In an industrial refrigeration system, brine (10% NaCl by
In an industrial refrigeration system, brine (10% NaCl by weight) having a viscosity of 0.0016 N s/m2 and a thermal conductivity of 0.85 W/m K is flowing through a long, 2.5-cm-ID pipe at 6.1 m/s. Und...
See AnswerQ: A miniature heat sink heat exchanger is constructed with circular cross section
A miniature heat sink heat exchanger is constructed with circular cross section channels (similar to that in Example 7.4), each of which has a diameter of 3.0 mm, drilled through a rectangular block....
See AnswerQ: Derive an equation of the form hc = f (T,
Derive an equation of the form hc = f (T, D, U) for the turbulent flow of water through a long tube in the temperature range between 20° and 100°C.
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