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parametric Influence on Thermal Performance of Flat Plate Closed Loop Pulsating Heat Pipes

Journal of Donghua University(English Edition) 2006年第3期23卷 8-13页

作者：杨洪海 KHANDEKAR Sameer GROLL Manfred College of Environmental Science and Engineering Donghua University Shanghai 201620 Institute of Nuclear Technology and Energy System University of Stuttgart 70569 Stuttgart Germany

This paper presents an experimental study on a flat plate closed loop pulsating heat pipes. It consisted of total 40 channels with square cross section （2 × 2 mm^2, 165 mm long） machined directly on an aluminum plate（180×120×3 nm^2）, which was covered by a transparent plate. The working fluid employed was ethanol. As the results, the influence parameters of thermal performance were investigated, such as filling ratio, heat load and operational orientations etc. Filling ratio was found to be a critical parameter, and its effect was rather complicated. According to its values the PHP plate could have four distinct working zones with different operational characteristics and heat transfer performance. The effect of heat load on thermal performance was found to be positive, and in general, iucrcasing the heat load would improve heat transfer performance. In order to analyze the effect of gravity on thermal performance, three different heat modes and total seven tilt angles were tested and compared. Successful operation at all orientations with respect to gravity was also achieved.

关键词： flat plate closed loop pulsating heat pipes parametric influences heat transfer characteristics.

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Two-Phase Flow Modeling in a Single Closed Loop Pulsating Heat Pipes

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Journal of Donghua University(English Edition) 2007年第4期24卷 439-444页

作者：杨洪海 Sameer Khandekar Sanka V. V.S. N.S. Manyam Manfred Groll College of Environmental Science and Engineering Donghua University Institute of Nuclear Technology and Energy System University of Stuttgart70569 StuttgartGermany

Mathematical modeling of pulsating heat pipes through ‘first’ principles is a contemporary problem which remains quite elusive. Simplifications and assumptions made in all the modeling approaches developed so far render them unsuitable for engineering design. In this paper, a more realistic modeling scheme is presented which provides considerable try for thought toward the next progressive step. At high enough heat flux level, closed loop pulsating heat pipes experience a bulk internal unidirectional fluid circulation. Under such a condition, conventional two-phase flow modeling in capillary tubes may be applied. This has been attempted for single-loop PHPs. A homogeneous model and a separated two-fluid flow model based on simultaneous conservation of mass, momentum and energy, have been developed for an equivalent ‘open flow’ system. The model allows prediction of two-phase flow parameters in each sub-section of the device thereby providing important insights into its operation. The concept of ‘void fraction constraint’ in pulsating heat pipe operation is introduced and its relevance to future modeling attempts is outlined.

关键词： Closed loop pulsating heat pipe flow modeling parametric influences

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