No abstract

No abstract

The start-up characteristics of a flat miniature loop heat pipe (LHP) with different heat loads were experimentally investigated in this article. Reasons for the difficulties in its start-up were analysed. An overall two-dimensional numerical model was developed to address the heat and mass transfer characteristics in the evaporator of the miniature LHP. The numerical results showed that the performance of the flat miniature LHP could be enhanced by improving the geometrical structure in a limited working space. Effects of thickness of the side wall, height of the compensation chamber, and the wick on system performance were discussed in detail.

No abstract

Testing of loop heat pipes (LHPs) showed that the heat-load dependence of the operating temperature was not always unambiguous. It may have hysteresis phenomena. The temperature hysteresis had a certain relationship with previous history of the power variation, and also related to the initial parameters of the LHP. It has been found that the temperature hysteresis of the LHP was related to the gas-liquid distribution in the compensation chamber (CC) which depended on the interaction between heat leak of evaporator and the reflux liquid from condenser. The temperature of the LHP evaporator rose with the gas phase in the compensation chamber increased.