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含油纳米制冷剂沸腾中纳米颗粒相间迁移机制,是评估纳米制冷剂沸腾传热效果和制冷系统中纳米颗粒循环能力的基础。本文基于颗粒捕集理论和气浮理论,提出了各因素对纳米颗粒相间迁移的影响机制;即纳米颗粒迁移率随其密度或粒径的减小而增大,制冷剂动力学黏度越小、密度越大,其完全蒸发时纳米颗粒迁移率越大,纳米颗粒迁移率随润滑油浓度的增大而减小,随热流密度的增大而减小,随初始液位高度的增加而增大。同时通过实验验证了理论分析。
The mechanism of nano-particles phase migration in oil-containing nano-refrigerant boiling is the basis for evaluating the boiling heat transfer effect of nano-sized refrigerants and the circulation ability of nano-particles in the refrigeration system. In this paper, based on the theory of particle trapping and air-float theory, the influence mechanism of various factors on the interphase migration of nanoparticles is proposed. That is to say, the mobility of nanoparticles increases with the decrease of density or particle size. The smaller the kinematic viscosity of refrigerant, The greater the mobility of nanoparticle when it is completely evaporated, the mobility of nanoparticle decreases with the increase of lubricant concentration, decreases with the increase of heat flux density, and increases with the increase of initial liquid level. At the same time, the theoretical analysis is verified through experiments.