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1. Calculate the critical heat flux on a large horizontal sur- face for the following fluids at 1 atm: mercury, ethanol, and refrigerant R-134a. Compare these results to the critical heat flux for water at 1 atm.
2. Water at atmospheric pressure boils on the surface of a large horizontal copper tube. The heat flux is 90% of the critical value. The tube surface is initially scored; however, over time the effects of scoring diminish and the boiling eventually exhibits behavior similar to that associated with a polished surface. Determine the tube surface temperature immediately after installation and after prolonged service.
3. The bottom of a copper pan, 150 mm in diameter, is maintained at 115°C by the heating element of an elec- tric range. Estimate the power required to boil the water in this pan. Determine the evaporation rate. What is the ratio of the surface heat flux to the critical heat flux? What pan temperature is required to achieve the critical heat flux?
Suppose a 24V drill has a current drawn from it that measures 5 amps. The drill bit is 2 inches in diameter. What force is the drill bit placing on the surface if the speed is 25 rpm? Assume the drill has an efficiency of 90%
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An autoclave contains 1000 cans of pea soup. It is heated to an overall temperature of 100°C. If the cans are to be cooled to 40°C before leaving the autoclave, how much cooling water is required if it enters at 15°C and leaves at 35°C?
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