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A spacecraft heat exchanger is to operate in a nitrogen atmosphere at a pressure of about 104

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A spacecraft heat exchanger is to operate in a nitrogen atmosphere at a pressure of about 104 N/m2 and 38?C. For a flat-plate heat exchanger designed to operate on earth, in air at one atmosphere and 38?C in turbulent flow, estimate the ratio of heat-transfer coefficients on the earth to that in nitrogen, assuming forced circulation cooling of the flat plate surface at the same velocity in both cases.GIVENFlat plate heat exchangers in turbulent flow in air and nitrogenNitrogen pressure = 104 N/m2Nitrogen and air temperature (T??) = 38?CAir pressure = 1 atm = 101,300 N/m2ASSUMPTIONSForced circulation coding of the plate surfaces at the same velocity in both casesSteady stateMoisture in the air is negligibleThe laminar portion of the boundary layer is negligibleVariation of Nitrogen properties with pressure is negligibleNitrogen behaves as an idealgas

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Principles of heat transfer

Principles of heat transfer

ISBN: 978-0495667704

7th Edition

Authors: Frank Kreith, Raj M. Manglik, Mark S. Bohn

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