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An experimental study of defrost on treated surfaces: Effect of frost slumping

机译：在处理过的表面上进行除霜的实验研究：霜冻的影响

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Highlights•Defrost processes are different on surfaces with varying wetting properties.•Frost falls off as a rigid body on the surperhydrophobic surface.•Frost melts, and part of the frost falls off with the draining meltwater on the superhydrophilic and plain surfaces.•Meltwater motions are suggested as a key factor of the defrost behaviors.•Frost slumping generally reduces defrost time and improves defrost efficiency.AbstractExperiments of defrost processes are reported for superhydrophilic, plain and superhydrophobic surfaces which are vertically placed. On the superhydrophobic surface, the frost layer falls off as a rigid body. On the superhydrophilic and plain surfaces, the frost melts, and part of the frost layer falls off with the draining meltwater. Defrost time is thus less for the superhydrophobic surface compared to that for superhydrophilic and plain surfaces. Frost slumping conditions are analyzed with a static force balance, and criteria for frost release are presented. Meltwater motions are suggested as the key factor of the defrost mechanism. When the volume flux of meltwater in the frost is greater than the melting rate, the meltwater is absorbed into the frost. When the volume flux of meltwater is less than the melting rate, it accumulates and drains on the surface. Water accumulation favors frost slumping because the adhesive force becomes weak. Frost slumping generally shortens defrost time and improves defrost efficiency based on our measurements.
机译： 突出显示 • 在具有不同润湿特性的表面上，除霜过程有所不同。 • 在超疏水表面上，霜作为刚体掉落。 / ce：para> • 霜融化了，部分霜随着排水的融化水在超亲水表面和平原表面上脱落。 < ce：label>• 建议进行融水运动作为除霜行为的关键因素。 • 霜冻通常可以减少除霜时间并提高除霜效率。 摘要 据报道，超亲水，平整和超疏水表面的除霜过程实验垂直放置。在超疏水性表面上，霜层像刚体一样脱落。在超亲水和平整的表面上，霜融化，并且一部分霜层随着排水的融化水而脱落。因此，与超亲水表面和平表面相比，超疏水表面的除霜时间更少。用静态力平衡分析了结霜条件，并提出了结霜标准。融水运动被认为是除霜机制的关键因素。当霜中的融水的体积通量大于融化速率时，融水被吸收到霜中。当熔体水的体积通量小于熔化速率时，它会在表面积聚并排出。由于粘附力变弱，水的积聚有利于霜冻的产生。根据我们的测量，结霜通常会缩短除霜时间并提高除霜效率。

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