Q: Crude oil at 22°C enters a 20-cm-
Crude oil at 22°C enters a 20-cm-diameter pipe with an average velocity of 32 cm/s. The average pipe wall temperature is 2°C. Crude oil properties are as given below. Calculate t...
See AnswerQ: Air (1 atm) enters a 5-mm-diameter
Air (1 atm) enters a 5-mm-diameter circular tube at an average velocity of 5 m/s. The tube wall is maintained at a constant surface temperature. Determine the convection heat transfer coefficient for...
See AnswerQ: The force F required to compress a spring a distance x is
The force F required to compress a spring a distance x is given by F – F0 = kx where k is the spring constant and F0 is the preload. Determine the work, in kJ, required to compress a spring a distance...
See AnswerQ: To cool a storehouse in the summer without using a conventional air
To cool a storehouse in the summer without using a conventional air-conditioning system, the owner decided to hire an engineer to design an alternative system that would make use of the water in the n...
See AnswerQ: Liquid mercury is flowing at 0.6 kg/s through
Liquid mercury is flowing at 0.6 kg/s through a 5-cm-diameter tube with inlet and outlet mean temperatures of 100°C and 200°C, respectively. The tube surface temperature is kept constant at 250°C. Det...
See AnswerQ: In the effort to find the best way to cool a smooth
In the effort to find the best way to cool a smooth, thin-walled copper tube, an engineer decided to flow air either through the tube or across the outer tube surface. The tube has a diameter of 5 cm,...
See AnswerQ: Water is heated at a rate of 10 kg/s from
Water is heated at a rate of 10 kg/s from a temperature of 15°C to 35°C by passing it through five identical tubes, each 5.0 cm in diameter, whose surface temperature is 60.0°C. Estimate (a) the stead...
See AnswerQ: Repeat Prob. 19–116 for a flow rate of 20
Repeat Prob. 19–116 for a flow rate of 20 kg/s. Data from Prob. 19-116: Water is heated at a rate of 10 kg/s from a temperature of 15°C to 35°C by passing it through five identical tubes, each 5.0 cm...
See AnswerQ: Water at 1500 kg/h and 10°C enters a
Water at 1500 kg/h and 10°C enters a 10-mm-diameter smooth tube whose wall temperature is maintained at 49°C. Calculate (a) the tube length necessary to heat the water to 40°C, and (b) the water outle...
See AnswerQ: The exhaust gases of an automotive engine leave the combustion chamber and
The exhaust gases of an automotive engine leave the combustion chamber and enter an 8-ft-long and 3.5-in-diameter thin-walled steel exhaust pipe at 800°F and 15.5 psia at a rate of 0.05 lbm/s. The sur...
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