VAPOR FLOW ANALYSIS IN A DOUBLE-WALLED CONCENTRIC HEAT PIPE

Abstract

The equation of fluid motion for the steady flow in a double-walled concentric heat pipe with various distributions of evaporation and condensation has been solved numerically. The conditions in the condenser section are decidedly more complex. Reverse flows occur in the condenser section and occupy a substantial fraction of the condenser length for high condensation cooling rates. Pressure drops and hydrodynamic entrance lengths are presented for symmetric and asymmetric cases, and practical results of the calculation of pressure losses for low-speed vapor flows in the double-walled concentric heat pipe are given.