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International Journal of Fluid Mechanics Research
ESCI SJR: 0.206 SNIP: 0.446 CiteScore™: 0.5

ISSN Druckformat: 2152-5102
ISSN Online: 2152-5110

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International Journal of Fluid Mechanics Research

DOI: 10.1615/InterJFluidMechRes.v25.i4-6.130
pages 588-599

Effect of Electric Fields on Frosting Phenomenon

Tetsuo Munakata
National Institute of Advanced Industrial Science and Technology, 1-2-1 Namiki, Tsukuba, Ibaraki, 305-8564, Japan
Akira Yabe
Mechanical Engineering Laboratory, Ministry of International Trade and Industry, 1-2 Namiki, Tsukuba, Ibaraki 305 Japan
Ichiro Tanasawa
Institute of Industrial Science, University of Tokyo Tokyo, Japan

ABSTRAKT

The effect of electric fields on frosting phenomenon was investigated. It has been known that the frost formation on a heat exchanger seriously affects the performance of the system, and that the application of an electric field will be one of the promising procedure because dielectric water molecules play the role of solidification nuclei. In order to understand the fundamental characteristics of the effect of electric fields on the frosting phenomenon, several experiments were earned out. The electric fields were applied between a frosting surface and a mesh electrode which was placed in parallel with the surface. The experimental results revealed that the electric fields affect the frosting pattern especially a dendritic growth during the early period of the frosting and the frosting rate is gradually decreased by increasing the electric field strength up to a certain value. After this critical value, the frosting rate is increased by increasing the field strength, because the corona wind is generated above this value. Moreover, the wettability of the frosting surface under electric field did not affect the frosting characteristics by comparing the results of copper and PTFE cases which were used as frosting surface material.


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