An analytical model has been formulated for the parametric study of liquid flow characteristics in the heat pipe, which consists of a porous tube, a closed outer container tube, and an annulus between them. The analytical model includes the effect of the rate of change of momentum, surface tension forces, the frictional forces in the body of wicking material and at the wall, as well as the axial variation of static pressure supporting the capillary meniscus at the liquid–vapor–wick interface in the vapor passage. The length of the condenser of the heat pipe was optimized as a function of the radial heat flux rate and the ratio of the liquid flow rate in the annulus to that within the wick, Wa/Ww. The effect of pressure loss and recovery in the vapor passage of the heat pipe on the optimum length of condenser was investigated.

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