The heat flux at which nucleate boiling begins can be calculated according to relations given in [7]: where x is a coefficient which takes into account liquid superheat in the pore layer as well as the effect of capillary forces. We have taken note of the difference between the geometrical and effective thickness of the condensate films formed on the pore coated cooling surface (not accounted for in [3]) as well as the significant dependence of condensate film thickness on the heat flow. These considerations allow us to propose the relationship: which describes heat transfer in our case. Figure 4 shows that equation (7) describes the experimental data quite well, which verifies the validity of our prior assumptions. Influence of Heat Pipe Construction Parameters We considered the effect of various heat pipe design parameters under conditions of both film evaporation and nucleate boiling from the wick since heat pipes are likely to
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