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

• 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
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06650238/
• 关键词: Elimination of Frost; Pulsasive high-tension charge; Hest exchanger; Frost structure; Corona wind; Electric fields; パルス印加電圧; 着霜抑制; 電場付与; ハ水性加工; 親水性加工; 強制対流; 自然対流; 垂直管

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.

为了促进结霜的消除和控制，研究了在一系列脉冲中施加高电压的方法。首先，从现象学的角度研究了电场对均匀流中管子周围结霜的影响。在表面和网状电极之间施加电场。表面霜层的去除取决于霜层的结构。在分离区获得了预期的电场效果。其次，采用NEOFLON-FEP薄膜作为结霜表面。可以预期，施加电场可以更容易地将霜层从表面去除，因为霜层与表面之间的结合强度变得比将铜表面用作霜层表面更弱。结果表明，表面润湿性不影响结霜重量过程。高电压的充电增加了麦克斯韦应力，促进了针状霜层的生长，这是由于质子有序的各向同性生长所致。但是，当脉冲频率较大、脉冲宽度较小时，即使是超高压电荷对霜层的各向同性生长也没有明显的影响。它们是利用电场防治生长霜的重要因素。

项目成果

Kenichi Ishihara: "Characteristics of Frost on a single Tube in Cross Flow and Control against the Growth of frost by Utilizing Electric Fields." Proc.of 31 National Heat Transfer Symposium of Japan. III. 1057-1059 (1994)

Kenichi Ishihara：“横流中单管上的霜特性以及利用电场控制霜的生长。”

"Control against the Growth of Frost Utilizing Electric Fields." Proc.of 33 National Heat Transfer Symposium of Japan. I(in press). (1996)

“利用电场控制霜的生长。”

石原健一: "一様流中に置かれた単一円管まわりの着霜特性と電場付与による霜成長の抑制" 第31回日本伝熱シンポジウム講演論文集. III. 1057-1059 (1994)

Kenichi Ishihara：“均匀流动中的单个圆管周围的霜形成特性以及通过施加电场抑制霜的生长”第 31 届日本传热研讨会论文集 III 1057-1059（1994 年）。

岡本賢一郎: "電場付与による霜成長の抑制と表面の濡れ性の効果" 第32回日本伝熱シンポジウム講演論文集. I. 171-172 (1995)

Kenichiro Okamoto：“通过施加电场抑制霜生长和表面润湿性的影响”第 32 届日本传热研讨会论文集 I. 171-172 (1995)。

岡本賢一郎: "電場付与による霜成長の抑制" 第33回日本伝熱シンポジウム講演論文集. I(印刷中). (1996)

Kenichiro Okamoto：“通过施加电场抑制霜生长”第 33 届日本传热研讨会论文集 I（正在出版）。