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Journal of Enhanced Heat Transfer
Импакт фактор: 1.406 5-летний Импакт фактор: 1.075 SJR: 0.287 SNIP: 0.653 CiteScore™: 1.2

ISSN Печать: 1065-5131
ISSN Онлайн: 1563-5074

Выпуски:
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Journal of Enhanced Heat Transfer

DOI: 10.1615/JEnhHeatTransf.v11.i4.90
pages 315-324

Phase-Change Heat Transfer in Micro-Capillary Grooves

Y. H. Zhao
Institute of Engineering Thermophysics, Chinese Academy of Sciences, P.O. Box 2706, Beijing 100080, P.R. China
X. G. Hu
Institute of Engineering Thermophysics, Chinese Academy of Sciences, P.O. Box 2706, Beijing 100080, P.R. China
Takaharu Tsuruta
Kyushu Institute of Technology, Sensui 1-1, Tobata, Kitakyushu, Fukuoka 804-8550, Japan
K. Yamamoto
Department of Mechanical Engineering, Kyushu Institute of Technology, Kitakyushu, Japan

Краткое описание

In the present paper, an experimental investigation about the phase-change heat transfer is performed on a vertical plate with rectangular micro-capillary grooves. The heat transfer is much enhanced compared to the pool nucleate boiling on a smooth surface. Boiling occurs, and vapor bubbles grow rapidly and rapture in the microgrooves as the wall heat flux is higher, while the heat transfer on the groove surface is a pure evaporation process at lower superheat. For smaller height surface, the mechanism of critical heat flux (CHF) is the same as that in usual pool boiling, but liquid supply limitation is essential to the maximum mean wall heat flux for larger height surface. The CHF is independent of the gravity. Furthermore, the experiment verified that the evaporative heat transfer only on the stable contact line (or meniscus) is small and incomparable to the value of CHF in usual pool boiling.


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