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Study on Prevention of Ice Adhesion to Cooling Wall due to Action of Electric Charge in Ice Storage

蓄冰库中电荷作用防止冷却壁附着冰的研究

基本信息

批准号：
14550198
负责人：
MATSUMOTO Koji
金额：
$ 2.24万
依托单位：
CHUO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2003
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14550198/
关键词：
Ice Storage Ice Slurry Prevention of Ice Adhesion to Wall Streaming Charging Static Electricity Electric Charge Ice Formation with Stirring Coulomb's force 油電場容器材質

项目摘要

One of authors has studied new ice slurry formed by cooling water-oil mixture with stirring for ice storage system. In the system, solution of ice adhesion to cooling wall is essential. When the mixture is stirred in a vessel, oil is charged by static electricity due to friction. If the vessel wall can attract charged oil, prevention of ice adhesion to the cooling wall may be realized. At first, in order to know an amount of electrification of only oil generated by stirring, characteristics of electrification for oil were discussed. Experiments were carried out, varying the number of rotations, size of stir wing and state of ground of the vessel. Moreover, after the stop of stirring, time-dependency of amount of electrification was measured. From, experimental results, optimal conditions were clarified. And an amount of electrification became about maximum at 20~25 minutes after the beginning of stirring, and that of electrification became about 0 at 5 minutes after the stop of stirring. In order to observe behavior of charged oil-water droplet or mixture in an electric field by a high speed camera or video camera, two types of experiments were carried out. One was that oil-water droplet charged by. static electricity was made to fall plumb down between two electrodes with electric field or without electric field, varying the water content of droplet. The other was that voltage of 200 V was applied on the vessel filled with oil-water mixture of 5Qvol% oil content with stirring. From the observations, it was confirmed that attracting force between the charged wall(electrode) and charged oil acted, oil content at the wall became about 70%. Moreover, oil content at the wall could be controlled by varying the voltage. And, it was shown that this result led to prevention of ice adhesion to cooling wall.

作者之一研究了利用搅拌冷却水-油混合物形成的新型冰浆用于冰蓄冷系统。在该系统中，解决结冰与冷却壁的粘结问题至关重要。当混合物在容器中搅拌时，油因摩擦而带电。如果容器壁能够吸引带电的油，就可以实现防止冰附在冷却壁上的目的。首先，为了了解仅搅拌产生的油的带电量，讨论了油的带电特性。进行了不同的旋转次数、搅拌翼的大小和容器的地面状态的实验。此外，在停止搅拌后，测量了带电量随时间的变化规律。根据实验结果，确定了最佳工艺条件。在搅拌开始后20~25min，带电量达到最大值，停止搅拌5min后，带电量约为0。为了用高速摄像机或摄像机观察带电油水液滴或混合物在电场中的行为，进行了两种类型的实验。一种是油水滴被带电。在有电场或无电场的情况下，使静电在两个电极之间垂直下降，从而改变液滴的水分含量。另一种方法是在装满含油量为5Qvol%的油水混合物的容器上搅拌，电压为200V。通过观察，证实了荷电壁(电极)和荷电油之间的引力作用，壁上的含油量达到了70%左右。此外，还可以通过改变电压来控制壁面的含油量。结果表明，这一结果防止了结冰与冷却壁的粘连。