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Study on improvement of pulsating heat pipe and prediction of heat transport characteristics

脉动热管改进及传热特性预测研究

基本信息

批准号：
18560193
负责人：
NAGASAKI Takao
金额：
$ 2.45万
依托单位：
Tokyo Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2006
资助国家：
日本
起止时间：
2006 至 2007
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-18560193/
关键词：
Heat pipe Self-oscillation Heat transport 熱工学機器冷却

项目摘要

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.

以水、乙醇和R141b为工质，研究了由加热段铜板和绝热段及冷却段24根铜管组成的脉动热管的传热特性。结果表明，在较低的热负荷范围内，R141b的PHP具有较高的性能，而在较大的热负荷范围内，水的PHP具有较高的性能。为了提高PHP与R141b的性能，将小金刚石颗粒添加到液体中。使用R141 b和颗粒的PHP性能在整个热负荷范围内都是上级的，这是由于颗粒的流动搅动增强了传热。除了管状PHP，板式PHP与曲折槽通道进行了研究。提出了一种新型的通道结构，即连接通道两端的通道也是曲折的。结果表明，以乙醇为工质时，新型通道的传热性能优于传统通道。此外，一个基本的实验上进行了一个简单的PHP，即，一个单一的液体段塞在一个直通道的振荡。通道的两个端部区域被加热，并且中心区域被冷却。利用高速摄像机观察了液塞的振荡过程，并测量了汽相区压力的变化。阐明了液体振荡和压力振荡之间的相位滞后引起对液体的功，这是PHPs的主要机理。对振荡液体引起的显热输运进行了精确的数值分析，并通过实验和数值计算结果的比较估计了潜热输运的作用。