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TEMPERATURE OSCILLATION MECHANISM OF A FLAT-TYPE LOOP HEAT PIPE
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ABSTRACT
Unstable operations like temperature oscillation often occur in loop heat pipes (LHPs) and therefore restrict their applications. Such instability issues are strongly related to the LHP structure, heat load, working fluid, filling ratio, gravity acceleration, and other factors. The mechanism of temperature oscillation of LHP is studied both experimentally and theoretically by investigating the vapor-liquid two-phase flow and its instability, which is directly related to temperature oscillation. A unique criterion formula was found to predict the occurrence of flow-related temperature oscillation. The results were validated by experiment. The study provides a theoretical basis for exploring ways to suppress temperature oscillations of LHPs.
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