Determine the rate of heat transfer per foot length to a light oil flowing through a 1-in.-ID, 2-ft-long copper tube at a velocity of 6 fpm. The oil enters the tube at 60?F and the tube is heated by steam condensing on its outer surface at atmospheric pressure with a heat transfer coefficient of 2000 Btu/(h ft2 ?F). The properties of the oil at various temperatures are listed in the accompanying tabulation

GIVENOil flowing through a copper tube with atmospheric pressure steam condensing on the outer surfaceOil properties listed aboveInside diameter (D) = 1 in = 0.0833 ftTube length (L) = 2 ftOil velocity (V) = 6 ft/min = 360 ft/hInlet oil temperature (Tb,in) = 60?FHeat transfer coefficient on outside of pipe ( hc,o)= 2000 Btu/(h ft2 ?F)ASSUMPTIONSSteady stateThe thermal resistance of the copper tube is negligibleConstant wall temperatureThe tube wall isthin

Transcribed Image Text:

T(°F) 100 150 60 80 57 212 P(lb/fr) 57 56 0.46 55 0.48 0.075 54 0.51 c(Btu/(lb °F) k (Btu/(h ft °F)) 0.43 0.077 0.44 0.077 100 577 0.076 0.074 µ (lb/h ft) 215 55 330 19 55 Pr 1210 116