Engineering, 26.03.2020 22:09 ragegamer334p3xlso
Assume the liquid film in Example 5.9 is not isothermal but instead has the following distribution TðyÞ T 0 ðT w T 0 Þ 1 yh where T 0 and T w are respectively the ambient temperature and the wall temperature The fluid viscosity decreases with increasing tem perature and is assumed to be described by μ μ 0 1 aðT T 0 Þ with a 0 In a manner similar to Example 5.9 derive an expression for the velocity profile
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When subject to a steady load (within elastic range) over a long period of time, what is the major difference in material behavoir between steel and plastic?
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On solidification from a melt, the polymer polyethylene forms a semi-crystalline spherulite structure. (i) sketch an individual spherulite and label the amorphous and crystalline regions. (ii) draw a schematic to show the changes in specific volume with temperature during cooling from the melt, comparing it to the theoretical extremes of fully crystalline and fully amorphous (indicate tm and tg)
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Define thermoplastic polymers and thermosetting polymers in terms of their structures, and (ii) describe briefly a process suitable for the production of products from each type of polymer.
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Aheat pump using refrigerant-134a heats a house by using underground water at 8°c as the heat source. the house is losing heat at a rate of 60,000 kj/h. the refrigerant enters the compressor at 280 kpa and 0°c, and it leaves at 1 mpa and 60°c. the refrigerant exits the condenser at 30°c. determine: (a) the power input to the heat pump, (b) the rate of heat absorption from the water, and (c) the increase in electric power input if an electric resistance heater is used instead of a heat pump
Answers: 2
Assume the liquid film in Example 5.9 is not isothermal but instead has the following distribution T...
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