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International Heat Transfer Conference 16

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

SUBCOOLED POOL BOILING WITH A PATTERNED HEATING SURFACE

Noriyuki Unno
Department of Mechanical Engineering, Tokyo University of Science, Yamaguchi, 1-1-1 Digakudo-ri, Sanyo-onoda, Yamaguchi, 756-0884 Japan

Kazuhisa Yuki
Department of Mechanical Engineering, Tokyo University of Science, Yamaguchi, 1-1-1 Digakudo-ri, Sanyo-onoda, Yamaguchi, 756-0884 Japan; and Department of Quantum Science and Energy Engineering, Graduate School of Engineering, Tohoku University, Aramaki-Aoba 01, Aoba-ku, Sendai, 980-8579, Japan

Risako Kibushi
Department of Mechanical Engineering, Tokyo University of Science, Yamaguchi, 1-1-1 Digakudo-ri, Sanyo-onoda, Yamaguchi, 756-0884 Japan

Shin-ichi Satake
Department of Applied Electronics, Tokyo University of Science, 6-3-1 Niijuku, Katsushika-ku, Tokyo 125-8585 Japan

K. Suzuki
Department of Mechanical Engineering, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510 Japan

DOI: 10.1615/IHTC16.bae.024100
pages 999-1005


KEY WORDS: Boiling and evaporation, Electronic equipment cooling, Microbubble emission boiling (MEB), Nanoimprint lithography

Abstract

Boiling heat transfer (BHT) is a promising cooling technology for next generation power electronics, whose maximum heat flux is predicted to be above 500 W/cm2 (5 MW/m2) at spot area. Although BHT can transport a large amount of heat by using gas-liquid phase change, critical heat flux (CHF) is one of big issues for practical use because CHF restricts the maximum heat flux in nucleate boiling. Therefore, the improvement of the maximum heat flux is strongly required to remove a high heat flux safely from the next generation power electronics. To improve the maximum heat flux, nanoparticles or patterned heating surfaces are widely used in BHT. In addition, microbubble emission boiling (MEB) is expected to be an advanced cooling technology because MEB can obtain the maximum heat flux beyond CHF. MEB is observed in highly subcooled boiling and many microbubbles are emitted from coalescing bubbles on a heating surface. Previously, MEB was investigated with a planar heating surface. Therefore, in this study, we investigate subcooled pool boiling using patterned heating surfaces, which is fabricated by nanoimprint lithography and micro contact printing. As a result, the experimental result found that surface pattern on a copper heating surface would prevent the occurrence of MEB.

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