Abstract

combined parameter, equation (16); specific heat at constant pressure; friction factor; mass velocity ; specific enthalpy ; average heat-transfer coefficient; duty parameter, equation (13); mass flow rate; Reynolds number; number ofentropy production units; = N, due to friction pressure drop AP; = N, due to heat transfer across a finite AT; Stanton number; number of heat-transfer units [5] ; wetted parameter; pressure ; heat-transfer rate per unit length; hydraulic radius ; dimensionless ratio of heat-transfer coefficient to pumping power; specific entropy; rate of entropy production [W/K] ; absolute temperature; passage axial coordinate.

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