【摘要】 平直翅片管换热器在低温高湿环境中工作极易发生结霜现象，造成能耗增加、故障率升高，而对结霜初期的微液滴施加振动作用可以加速微液滴的滑落过程从而达到抑制结霜的效果。对结霜前期微液滴的生长过程进行数值模拟分析，并通过文献值验证了数值模拟的可靠性，然后利用不同时刻的微液滴数据，通过数值模拟的方式，研究不同振动频率作用下微液滴的运动特性，最后搭建试验平台进行验证。研究结果发现，不同体积的微液滴对应的最优振动频率有所不同，当微液滴体积较小时，较高的振动频率使微液滴在基管壁面来回振荡，不易滑落，当微液滴体积较大时，较高的振动频率有利于微液滴克服壁面摩擦力，有利于液滴滑落。更多还原

【Abstract】 In aflat finned tube heat exchanger working in low temperature and high humidity environment, frost phenomenon is easy to occur, resulting in increased energy consumption and failure rate. The vibration effect on the microdroplet at the initial stage of frost formation can accelerate the sliding process of the microdroplet and thus achieve the effect of frost formation. The growth process of microdroplet in the early stage of frosting was numerically simulated and analyzed, and the growth characteristics of microdroplet on different surfaces were obtained and verified by the literature values. Then, the effects of different vibration frequencies were studied by using the data of microdroplet at different times through numerical simulation, and finally an experimental platform was built for verification. Results show that for different surfaces, the larger the surface contact angle is, the slower the growth rate of microdroplet is. The optimal vibration frequency corresponding to different volumes of microdroplets is different. When the volume of microdroplets is small, the higher vibration frequency makes the microdroplets oscillate back and forth on the wall surface of the base tube, which is not easy to slip off. When the volume of microdroplets is large, the higher vibration frequency is conducive to the microdroplets overcoming the wall friction and the droplet sliding off.更多还原