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.

一位作者研究了通过搅拌以冰储存系统冷却水油混合物而形成的新冰浆。在系统中，对冷却壁的冰粘合溶液至关重要。当混合物在容器中搅拌时，由于摩擦而被静电充电。如果容器壁可以吸引带电的油，则可以预防对冷却壁的冰粘合。首先，为了了解仅通过搅拌产生的油的电气化，讨论了油的电化特征。进行了实验，改变了旋转的数量，搅拌翼的尺寸和容器的地面状态。此外，在停止搅拌之后，测量了电气化量的时间依赖性。从实验结果中，阐明了最佳条件。在搅拌开始后的20 〜25分钟时，一定数量的电化量大约最大，而电气化的电气化在搅拌后5分钟就变为0。为了通过高速摄像头或摄像机观察电场中带电的油水液滴或混合物的行为，进行了两种类型的实验。一个是那些被指控的油水液滴。使静态电力在两个带电场或无电场的电极之间下降，从而改变了液滴的水含量。另一个是将200 V的电压施加在装有5QVOL％油含量的油水混合物上的容器上。从观察结果中，可以证实，在充电壁（电极）和带电的油中吸引力，墙壁上的石油含量变为70％。此外，可以通过改变电压来控制墙壁上的油含量。而且，结果表明，这种结果导致预防冷却壁上的冰粘附。