Heat pipes vapor pressure distribution

FIGURE 12.3 (a) variation of meniscus curvature as a function of axial position [7] (b) typical liquid and vapor pressure distributions in a heat pipe [7],... 

Figure 13.2 shows the distribution of different operating parameters in a heat pipe. Figure 13.2(a) shows the wick structure and the interface of the liquid-vapor film. Figure 13.2(b) shows the wall temperature of the heat pipe and the corresponding vapor temperature distribution. Figure 13.2(c) shows the vapor and liquid pressure distribution. The liquid pressure drop from the condenser side to the evaporator side is due to Darcy pressure drop. Figure 13.2(d) indicates that the liquid and vapor flow rates are equal at any cross section as there is no inflow and outflow due to the closed end of the heat pipe. 

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