Engineering, 22.05.2020 18:04, shantejahtierr63961
Transient conductionA slab of pure aluminum is 2 cm thick, 1 m wide, and 1 m tall. It is initially at a temperature of 500oC. What is the temperature of the slab after 3 minutes for the following cases?
A) If the slab is exposed to air at 20oC flowing on both sides with h = 150 W/m2·K.
B) If the slab is exposed to air at 20oC flowing on both sides with h = 150 W/m2·K, but one side(1 m x 1 m) is covered by a sheet of plastic that is 1 cm thick with kplas = 0.5 W/m·K. I. e. air flows on one surface of the metal and one surface of the plastic.
C) If the slab (only metal) is in a vacuum chamber with walls that are held at a temperature of 100oC. Consider the slab to have a thin coating of oxidation that results in an emissivity of 0.8.
D) If the slab (only metal) is exposed to air at 20oC flowing on both sides with h = 150 W/m2·K but there is an electric current of 300 A flowing through the plate, with a voltage of 150 V across the plate. Also determine the Biot number for the slab in each case and explain any complexity in calculating it.
Answers: 3
Engineering, 03.07.2019 15:10, theamandawhite
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Acompressor receives the shaft work to decrease the pressure of the fluid. a)- true b)- false
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Engineering, 04.07.2019 18:10, soreese02
An ideal otto cycle with air as the working fluid has a compression ratio of 8. the minimum and maximum temperatures in the cycle are 300 k and 1340 k. use constant specific heats at room temperature to determine (a) the amount of heat transferred to the air during the heat- addition kj/kg, (b) the thermal efficiency, and (c) the thermal efficiency of a carnot cycle ope limits. process, in rating between the same temperature
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Transient conductionA slab of pure aluminum is 2 cm thick, 1 m wide, and 1 m tall. It is initially a...
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