Heat pipes are highly reliable and efficient energy transport devices, which are being considered for many terrestrial and space power thermal-management applications, such as high-performance aeronautics and space nuclear and solar dynamic power systems. In this work, a two-dimensional Heat Pipe Transient Analysis Model, "HPTAM", was developed to simulate the transient operation of fully-thawed heat pipes and the startup of heat pipes from a frozen state. The model incorporates:(a) sublimation and resolidlfication of working fluid;(b) melting and freezing of the working fluid in the porous wick;(c) evaporation of thawed working fluid and condensation as a thin liquid film on a frozen substrate;(d) free-molecule, transition and continuum vapor flow regimes, using the Dusty Gas Model;(e) liquid flow and heat transfer in the porous wick;and (0 thermal and hydrodynamic couplings of phases at their respective interfaces.
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