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Heat Transfer (ME-345) EMU Mechanical Engineering Spring 2014-2015 Closed Book Quiz. Name: Quiz # 2 Allotted time: 45 minutes ID #: Problem 1: Engine oil at 80°C flows over a 10-m-long flat plate whose temperature is 30°C with a velocity of 2.5 m/s. Determine the total drag force and the rate of heat transfer over the entire plate per unit width. (2.5 marks) Solution: Problem 2: Water at 15ºC is to be heated to 65ºC by passing it over a bundle of 4-m-long 1-cmdiameter resistance heater rods maintained at 90ºC. Water approaches the heater rod bundle in normal direction at a mean velocity of 0.8 m/s. The rods arc arranged in-line with longitudinal and transverse pitches of SL = 4 cm and ST = 3 cm. Determine the number of tube rows NL in the flow direction needed to achieve the indicated temperature rise. (2.5 marks) Solution: Formula: