Abstract
An osmotic heat pipe is a top-heat-mode heat pipe in which a heat transport medium flowing down is pumped up by means of osmosis in the membrane module. The osmosis is dependent on the concentration difference between the solution at the inside surface and the solvent at the outside surface of the membrane. In addition, convection in the solution inside the membrane affects the concentration of the solution in contact with the inside surface. Thus, the concentration and solution flow rate greatly affect the osmotic pumping rate and the heat transport rate. Therefore, in the present study, the flow in the membrane module was investigated in detail. Using the ratio of the concentration at the inside surface to the mixed mean concentration at the corresponding site, relations for these concentrations and the solution flow rate along the solution channel in the membrane module are derived semitheoretically. These relations can be used to correlate experimental data to within a ±20% error. In addition, a method for increasing the osmotic pumping rate and the heat transport rate of the osmotic heat pipe is proposed. © 2000 Scripta Technica, Heat Trans Asian Res, 29(4): 317–332, 2000
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