Promotion of frost elimination applying super high-tension in a series of pulses

为了促进结霜的消除和防治，研究了在一系列脉冲中施加高压。首先从现象学上研究了均匀流动中电场对管内结霜的影响。电场施加在表面和网状电极之间。从表面去除霜取决于霜的结构。在分离区得到了预期的电场结果。其次，采用NEOFLON-FEP薄膜表面作为磨砂表面。由于结霜表面与结霜表面之间的结合强度比用铜表面作为结霜表面要弱，因此可以预期，施加电场可以更容易地去除表面上的结霜。结果表明，表面润湿性对霜重过程没有影响。然而，neoflon - fep薄膜表面的结霜高度低于铜表面的结霜高度。高压电荷对霜的生长具有很强的抑制作用，因为它增加了麦克斯韦应力，促进了质子有序非各向同性生长的针状霜的生长。而当脉冲频率较大、脉宽较小时，即使超高压电荷对霜的各向同性生长也没有明显的影响。它们是电场防治生长霜的重要因素。

In order to promote the elimination and control against the growth of frost, it is examine to impress high voltage in a series of pulses.In the first place, the effect of electric field on the frost formation around a tube in the uniform flow is studied phenomenologically. The electric field is applied between the surface and the mesh electrode. Removing of the frost from the surface depends on the structure of frost. The expected result of the electric field were obtained in the separation region.In the second place, a NEOFLON-FEP thin film surface was used as a frosting surface. It could be expected that the frost may be removed from the surface more easily by applying the electric fields, because the bounding strength between the frost and surface becomes weaker than a copper surface was used as the frosting surface. The results reveal that the wettability of the surface is not affect the frosting weight process. However, frost height on a NEOFLON-FEP-film surface was formed lower than frost height on a copper surface.Charge of high voltage has a highly inhibitory action against the growth of frost because it increases the Maxwell's stress and promote the growth of needle-shaped frost due to the nonisotropic growth occured by ordering of proton. But, when pulse frequency is large and pulse width is small, even charge of super high tension took no recognizable effect to the isotropic growth of frost. They are important factors on the control against the growth frost utilizing electric field.