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Journal of Enhanced Heat Transfer
Factor de Impacto: 0.562 Factor de Impacto de 5 años: 0.605 SJR: 0.211 SNIP: 0.361 CiteScore™: 0.33

ISSN Imprimir: 1065-5131
ISSN En Línea: 1026-5511

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Journal of Enhanced Heat Transfer

DOI: 10.1615/JEnhHeatTransf.v1.i4.30
pages 315-326

Cooling Characteristics with Microchanneled Structures

Xiao-Feng Peng
Laboratory of Phase Change and Interfacial Transport Phenomena, Department of Thermal Engineering, Tsinghua University, Beijing 100084
Bu-Xuan Wang
Laboratory of Phase Change and Interfacial Transport Phenomena, Department of Thermal Engineering, Tsinghua University, Beijing 100084, China
Professor Wang has been an influential educator of thermal engineering in China. He established firstly a new speciality â Engineering Thermophysics in Tsinghua University in 1957. Professor Wang was a founding member of the Chinese Society of Engineering Thermophysics. He was appointed by the State Education Commission as Chairman of the Committee for Basic Engineering Teaching on Thermodynamics & Heat Transfer in Colleges and Universities during 1979-1995, and as a leading member of the evolving section Power Engineering & Engineering Thermophysics of National Degree Committee from 1981-1997. Professor Wang's research, a number of projects he undertook were prompted by national needs. For example, from 1963 to 1966, he led a research team seeking to accelerate the synthesis of ammonia in a large Sichuan chemical plant by enhancing heat transfer through a resign of compact heat exchanger within a tower so as to provide more effective catalystic volume and to obtain a more favorable temperature distribution in the piled catalyst. The efforts resulted in a doubling of the daily production, which is listed in the State Conncil's Government Bulletin of 1966 as one of the hundred important achievements.

SINOPSIS

Experiments were conducted to investigate the heat transfer characteristics and cooling performance of subcooled liquid, water or methanol, flowing through rectangular cross-section microchanneled structures machined onto a stainless steel plate. The results provide significant data and considerable insight into the heat transfer and cooling mechanisms using microchanneled structures. It was found that a heat transfer or flow mode transition existed when the heating rate or wall temperature was increased. This transition was found to be induced by the variation in liquid thermophysical properties due to the great rise of the liquid temperature in the microstructures. The influence of such parameters as liquid velocity, subcooling, property variation, and microchannel geometric configuration on the heat transfer behavior were experimentally investigated, as well as the cooling performance, heat transfer and liquid flow mode transition. The experiments indicated that the single phase forced convection and flow boiling characteristics were different from those in normally sized tubes and the heat transfer in microchannels was intensified. No apparent partial nucleate boiling existed for subcooled flow boiling, i.e., fully-developed boiling was induced much earlier in the microchannels.


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