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

在一系列脉冲中施加超高张力促进除霜

基本信息

批准号：
06650238
负责人：
KUMADA Masaya
金额：
$ 1.28万
依托单位：
Gifu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

项目摘要

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.

为了促进消除和控制霜冻的生长，可以检查一系列脉冲中的高电压，从而使电场对均匀流动中管子周围霜冻形成的影响进行现象学上的研究。电场在表面和网格电极之间施加。从表面清除霜冻取决于霜冻的结构。在分离区域中获得了电场的预期结果。在第二位，将新蛋白 - 弗洛克薄膜表面用作糖霜表面。可以预期，通过施加电场可以更容易从表面上去除霜，因为将霜冻和表面之间的边界强度比铜表面较弱，用作糖霜表面。结果表明，表面的润湿性不影响糖霜的重量过程。然而，在铜表面上形成了Neoflon-FEP-FILM表面上的霜冻高度低于霜高的高度。高压电荷具有高度抑制作用，因为它会增加麦克斯韦的压力，并促进麦克斯韦的压力，并促进因质子的订购而导致非异常生长引起的针状霜的生长。但是，当脉冲频率较大并且脉冲宽度很小时，即使是超高张力的电荷也对霜冻的各向同性生长没有任何可识别的影响。它们是控制使用电场的生长霜的重要因素。