ACTIVE ENHANCEMENT OF PHASE CHANGE HEAT TRANSFER USING ELECTRIC FIELD

本研究的目的是为沸腾和冷凝等相变换热过程的主动强化技术奠定基础。众所周知，强化换热是适用于许多不同领域的关键技术之一，如有效利用能量的小温差换热，电子设备的冷却，以及新材料制造中物质的超快速冷却。虽然利用相变换热可以获得较高的换热效率，但如果适当地利用外部电场的效应(EHD效应)，还可以进一步改进。在这个合作研究项目中，六名科学家，三名来自日本，三名来自罗马尼亚，已经在各自的大学从事了两年的研究。同时，他们还参观了合作伙伴的实验室，观察那里发生的事情。日本团队主要研究电场对水平低翅片管上蒸汽薄膜冷凝的影响，罗马尼亚团队研究电场对核态沸腾中蒸汽气泡行为的影响。研究结果的细节发表在研究报告中(从12日开始)。

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).