著者

相沢 亮汰 石井 慶子 麓 耕二

出版者

日本実験力学会

雑誌

実験力学 (ISSN:13464930)

巻号頁・発行日

vol.19, no.4, pp.281-286, 2020-01-20 (Released:2020-01-25)

参考文献数

11

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Heat transport devices using temperature-sensitive magnetic fluids are fast to start, have high heat transfer efficiency, and can be downsized. In addition, it has the advantage that it is not affected by the installation posture compared to conventional heat transport equipment. In order to apply a temperature-sensitive magnetic fluid to a heat transport device, it is necessary to clarify the heat flow characteristics of this fluid. However, since the ferromagnetic particles in the fluid are black and fine, observation with a microscope was difficult. In this study, the microcapsules contain a temperature-sensitive magnetic fluid, which enables fluorescence observation. Capsules were made by mixing a temperature-sensitive fluid, polymer, organic solvent, and fluorescent dye and dispersing in pure water mixed with a surfactant. Microcapsule aqueous solutions have been shown to have properties similar to magnetic fluids. When this solution was flowing, it was confirmed that when a magnetic field was applied, clusters were formed near the wall and a unique velocity distribution was formed. It was confirmed that as the solution temperature increased, the possibility of cluster formation decreased.

著者

石井 慶子 麓 耕二

出版者

日本実験力学会

雑誌

実験力学 (ISSN:13464930)

巻号頁・発行日

vol.18, no.3, pp.163-168, 2018-10-11 (Released:2018-10-12)

参考文献数

8

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The mechanism of Pulsating Heat Pipe (PHP) is still unclear because of its complex thermal fluid property. There are few researches that measured the temperature distribution inside the PHP. This study executed the visualization of temperature distribution inside a PHP. Temperature sensitive paint was painted on the optical window. The TSP was excited by UV LED light and the luminescence intensity was captured by CMOS camera. The fluid and wall temperature inside the PHP was measured instantaneously. We captured a thermal flow induced by the evaporation and oscillation. The measurement accuracy was 0.2 ° C. We measured the temperature of working fluid adhering to the wall surface that was colder than the ambient temperature. When the flow was oscillating, the temperature at an arbitrary point inside the channel was fluctuated. On the other hand, when the low was circulating, the temperature at the channel became stable apparently. Acquired data was qualitatively in agreement with known PHP properties. Temperature measurement by TSP is considered to be effective for PHP performance evaluation and flow mechanism investigation.