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为了评估纳米颗粒对沸腾传热的影响效果和采用纳米制冷剂的制冷系统长期运行稳定性,提出了含油纳米制冷剂沸腾中纳米颗粒相间迁移特性预测模型,通过模拟气泡的脱离和上升过程、纳米颗粒的运动、纳米颗粒与气泡的黏附、气液交界面上纳米颗粒的脱离,最终得到纳米颗粒的迁移量。该模型能够反映热流密度和加热容器几何结构等因素对纳米颗粒迁移特性的影响,模型预测值与95%的实验值的偏差在20%以内。
In order to evaluate the influence of nanoparticles on boiling heat transfer and the long-term operation stability of the refrigeration system using nano-refrigerants, a prediction model for the phase migration characteristics of nano-particles in oil-bearing nano-sized refrigerants during boiling is proposed. By simulating the process of bubble detachment and ascent, The movement of particles, the adhesion of nanoparticles and bubbles, the detachment of nanoparticles from the gas-liquid interface and finally the migration of nanoparticles. The model can reflect the influence of heat flux density and the geometry of the heating vessel on the migration characteristics of nanoparticles. The model predictions deviate from the 95% experimental values by less than 20%.