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the heat pipe (HP) performance under low temperatures is theoretically studied. The developed mathematical model describes the HP behavior under conditions when locations of the evaporator and condenser sections are not defined a priori and can eventually be changed during the HP operation. Typical application of such a HP configuration is the thermo-stabilized structural honeycomb panel of satellites. Usually the ammonia is used in these HP applications; however the acetone is investigated as a low hazardous alternative of the working fluid. This paper aims to examine how the acetone HP will perform under cold conditions close to the viscous and sonic limits. Once the limit is violated, the spots of local dry-out occur. The numerical algorithm used in the model is based on the control volumes approach. Energy balance on the equipment-panel level is solved in conjunction with the working fluid momentum and mass conservation along HP axial direction. Dynamic variations of wetting angle and groove flooding are taken into account. The scenarios of normal operation, start-up, local dry-out and warming up are investigated.

Analysis of heat spreading performance of acetone-filled heat pipe at low temperatures for using in satellite honeycomb panels