Study on improvement of pulsating heat pipe and prediction of heat transport characteristics
| Project/Area Number |
18560193
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Thermal engineering
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
NAGASAKI Takao Tokyo Institute of Technology, Interdisciplinary Graduate School of Science and Engineering, Associate Professor (30155923)
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| Project Period (FY) |
2006 – 2007
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| Project Status |
Completed (Fiscal Year 2007)
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| Budget Amount *help |
¥3,830,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥330,000)
Fiscal Year 2007: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2006: ¥2,400,000 (Direct Cost: ¥2,400,000)
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| Keywords | Heat pipe / Self-oscillation / Heat transport / 熱工学 / 機器冷却 |
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| Research Abstract |
Heat transport characteristics of a pulsating heat pipe (PHP), which consists of a copper plate in the heating section and 24 copper tubes in the adiabatic and cooling sections, has been investigated using water, ethanol and R141b as the working fluid. It was found that PHP with R141b has higher performance in lower heat load range, and that with water has higher performance in larger heat load range. In order to enhance the performance of PHP with R141b, small diamond particles were added to the liquid. The PHP performance using R141b with particles was superior in the whole range of heat load due to the heat transfer enhancement by the flow agitation owing to the particles. In addition to the tubular PHP, a plate-type PHP with a meandering groove channel was investigated. A new type channel configuration was proposed, that is, the channel which connects both ends of channels was also meandered. It was revealed that the new type channel has higher heat transport performance than the conventional one when ethanol was used as the working fluid. Further, a fundamental experiment was performed on a simple PHP, that is, an oscillation of a single liquid slug in a straight channel. Both end regions of the channel were heated, and the center region was cooled. The oscillation of liquid slug was visualized by a high-speed video, and the change of pressure in the vapor region was also measured. It was clarified that the phase lag between the liquid oscillation and pressure oscillation causes a work to the liquid, which is the principal mechanism of PHPs. An exact numerical analysis was performed for the sensible heat transport due to the oscillating liquid, and the role of latent heat transport was estimated by the comparison between experimental and numerical results.
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Report
(3 results)
Research Products
(12 results)
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[Presentation] 自励振動ヒートパイプの熱輸送特性2007
Author(s)
長崎孝夫
Organizer
日本ヒートパイプ協会第26回総会講演会
Place of Presentation
早稲田大学(東京)
Year and Date
2007-06-30
Description
「研究成果報告書概要(和文)」より
Related Report
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[Presentation] 自励振動ヒートパイプの壁温変動2006
Author(s)
外薗寿幸、長崎孝夫、伊藤優
Organizer
日本機械学会熱工学コンファレンス
Place of Presentation
慶應義塾大学(横浜市)
Year and Date
2006-11-25
Description
「研究成果報告書概要(和文)」より
Related Report
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