| Citation: | LIU Cheng, XIE Rongjian, WANG Shiyue, et al. Visualization experimental study of compensation chamber of a propylene loop heat pipe[J]. Journal of Beijing University of Aeronautics and Astronautics, 2020, 46(5): 933-940. doi: 10.13700/j.bh.1001-5965.2019.0322(in Chinese)
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By the employment of quartz compensation chamber and high-speed camera, the visualization experimental study on the compensation chamber of a propylene loop heat pipe was implemented, which mainly focused on the variation of state of working fluid in the compensation chamber with the effect of the working fluid inventory and heat transfer capacity, and the effect of working fluid inventory on the heat transfer performance of the loop heat pipe. The results indicate that the optimal working fluid inventory for the loop heat pipe with volume of 51.4 mL is about 19.7 g. The liquid levels inside the compensation chamber are lower than the bayonet when the fluid inventory is less than the optimal one, intense two-phase heat exchange between the evaporator and the compensation chamber is confirmed by the observation of obvious condensation and flow of the liquid on the outer surface of the bayonet, and the condensation rate and flow velocity increase with the rise of heat transfer capacity; the heat transfer thermal resistance of the loop heat pipe decreases and the heat transfer capacity below 280 K increases with the rise of the fluid inventory. With an optimal fluid inventory, the liquid level inside the compensation chamber immerses the bayonet and is close to the top of the evaporator core, and thus the best performance is obtained: a maximum power of 40 W that can be transferred below 280 K and a corresponding thermal resistance of 2 K/W. Liquid levels inside the compensation chamber are higher than the top of the evaporator core when the fluid inventory is more than the optimal one. The heat transfer thermal resistance increases and the heat transfer capacity below 280 K decreases with the rise of the fluid inventory. The liquid distribution inside the compensation chamber and evaporator core has considerable effect on the heat leak between the evaporator and the compensation chamber, which is a significant factor for the influence of working fluid inventory on the performance of loop heat pipe.
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