ps2 - ME 322 PS#2 02-03 April 2008 1 A bakelite coating is...

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ME 322 PS #2 02-03 April 2008 1. A bakelite coating is to be used with a 10-mm-diameter conducting rod, whose surface is maintained at 200ºC by passage of an electrical current. The rod is in a fluid at 25ºC, and the convection coefficient is 140 W/m 2 K. (a) What is the critical radius associated with the coating? (b) What is the heat transfer rate per unit length for the bare rod and for the rod with a coating of Bakelite that corresponds to the critical radius? (c) How much Bakelite should be added to reduce the heat transfer associated with the bare rod by 25%? 2. An aluminum rod of 12 cm long and 1.0 cm in diameter is exposed to an environment at 20ºC. Both ends of the rod are maintained at 100ºC . The heat transfer coefficient between the rod and the environment is 1000 W/m 2 ºC. Calculate the heat loss from the rod. Q 100 degC 100 degC environment at 20 degC 3. A nuclear fuel element of thickness 2 L is covered with a steel cladding of thickness b . Heat generated within the nuclear fuel at a rate q & is removed by a fluid at
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