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Study on the ice formation and its removal phenomena on cooled surface

冷却表面结冰及除冰现象研究

基本信息

批准号：
12650197
负责人：
HIRATA Tetsuo
金额：
$ 2.37万
依托单位：
Shinshu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2002
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12650197/
关键词：
Ice storage Ice formation Ice removal Liquid ice Aqueous solution Pipe flow Vertical tube Cooled plate thickness エチレングリコール水溶液鉛直平板冷却面材質円管内流れ傾斜平板エタノール水溶液

项目摘要

In the previous study, the investigator examined an ice formation phenomenon of aqueous solution on a cooled plate, whose thermal conductivity was comparatively small. It was reported that the ice formed on a cooled plate could be removed from the plate surface due to buoyancy force acting on the ice. The present study is a basic research to apply the ice removal phenomena for practical use.1. Study on ice removal phenomena around vertical cooled tubeAn ethylene glycol aqueous solution was frozen with cooling a cooled polyvinyl chloride tube. It was found that the formed ice crystal on the cooled tube could be removed due to buoyancy force even on the vertical tube. It implies the possibility of increase of ice formation rate by installing many vertical tubes on the bottom of an ice storage vessel. It was also found that an appropriate value of the tube length exists for the onset condition of ice removal phenomena.2. Ice removal phenomena in a cooled pipe with flowing aqueous solutionIce formation and its removal phenomena in a cooled pipe were examined. It was found that the ice formation rate increases with decreasing flow velocity of aqueous solution. However, for very low velocity, the ice crystal was not removed from the pipe surface and an ice layer was formed over the surface.3. Effect of cooled plate thickness on the ice removal phenomenaIce was formed on a horizontal cooled plate with using different thickness of polyvinyl chloride plate. It was found that the thickness of 1.0-1.5mm was preferable for the ice removal phenomena.

在先前的研究中，研究人员检查了水溶液在冷却板上的冰形成现象，其导热率相对较小。据报道，由于浮力作用于冰，在冷却的平板上形成的冰可以从平板表面去除。本研究是将除冰现象应用于实际应用的基础性研究.垂直冷却管周围除冰现象的研究乙二醇水溶液在聚氯乙烯冷却管中被冻结。研究发现，即使在垂直管上，由于浮力的作用，在冷却管上形成的冰晶也可以被去除。这意味着在蓄冰容器底部安装许多垂直管可以提高蓄冰速率。实验还发现，对于除冰现象的起始条件，存在一个合适的管长值.水溶液流动时冷却管内的除冰现象研究了冷却管内的结冰现象和除冰现象。实验结果表明，随着水溶液流速的减小，冰的形成速率增大。然而，对于非常低的速度，冰晶没有从管道表面去除，并且在表面上形成冰层。3.冷却板厚度对除冰效果的影响采用不同厚度的聚氯乙烯板在水平冷却板上形成冰。结果表明，1.0-1.5mm的厚度有利于除冰现象的发生。