ACTIVE ENHANCEMENT OF PHASE CHANGE HEAT TRANSFER USING ELECTRIC FIELD

本研究的目的是为主动强化沸腾、冷凝等相变传热过程的技术奠定基础。人们普遍认为，强化传热是一项关键技术，可应用于能量有效利用的小温差传热、电子设备的冷却、新材料制造中物质的超快速冷却等许多不同领域。虽然利用相变传热是获得高传热率的首选方法，但如果适当利用外电场效应（ehd效应），则可以进一步改进。在这个合作研究项目中，6名科学家，其中3名来自日本，3名来自罗马尼亚，已经在他们自己的大学从事了两年的研究。与此同时，他们互相访问了合作伙伴的实验室，观察那里的情况。日本研究小组主要研究了电场对水平低翅片管内蒸汽成膜凝结的影响，罗马尼亚研究小组则研究了电场对成核沸腾过程中蒸汽气泡行为的影响。研究结果的详细内容发表在研究报告中（12月起）。

The objective of this research is to establish a fundamental basis for the technique of active enhancement of the phase change heat transfer processes, such as boiling and condensation.As is widely recognized, heat transfer enhancement is one of the key technologies applicable to many different areas such as the small-temperature-difference heat transfer for effective energy utilization, colling of electronic equipments, and ultra-rapid cooling of substances in manufacturing of new materials. Although utilization of phase change heat transfer is preferable in attaining a high heat transfer rate, further improvement can be achieved if the effect of an external electric field (ehd effect) is properly employed.In this cooperative research project, six scientists, three from Japan and three from romania, have been engaged in the research for two years at their own universities. At the same time they visited each other the partners' laboratories to observe what were going on there.The Japanese team investigated mainly the effect of electric field on film condensation of steam on a horizontal low-finned tube, while the romanian group studies the effect of electric forces on the behavior of vapor bubbles in nucleate boiling. The details of the results are published in the reseach report (from 12).