著者

近藤 義広 越田 博之

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 (ISSN:21879761)

巻号頁・発行日

vol.84, no.858, pp.17-00438-17-00438, 2018 (Released:2018-02-25)

参考文献数

12

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Porous metal fin was used as boiling heat transfer plate of phase change devices. The number of cells of the porous metal fin is 8 ppi, and the pore diameter of the porous metal fin is 3.1 mm. On the boiling heat transfer surfaces, the porous metal fin and the bass plate are brazed. Three samples of boiling heat transfer plates with the porous metal fin were made as prototype. For HFE7000 and HFE7100 made by 3M Company as working fluid, the boiling heat transfer coefficient of the boiling heat transfer plate with porous metal fin with surface roughing process by ultrasonic wave is 15 kW/m2・K. And the vale is 2.5 times of the boiling heat transfer coefficient of the flat plate without fin. Predicting method of the boiling heat transfer coefficient to which the expansion ratio of effective area for the flat plate was added to correlation of the boiling heat transfer coefficient of Stephan’s equation. The boiling heat transfer coefficient in the heat transfer plate with surface roughing process by ultrasonic wave can be put in order by ± 10 %.

著者

近藤 義広 越田 博之

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 (ISSN:21879761)

巻号頁・発行日

vol.82, no.844, pp.16-00173-16-00173, 2016 (Released:2016-12-25)

参考文献数

10

被引用文献数

1

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In order to evaluate the cooling performance of the porous metal fins, both the friction factor and heat transfer coefficient were taken into account. In this study, we compared six porous metal fins and four kinds of heat exchangers made of porous material. Moreover, we proposed a new model which predicts the cooling performance of the porous metal fins. Friction loss factor of porous metal fins became predictable in less than ±10% error by using effective cross-sectional flow area and Ergun coefficient in Forchheimer-extended Darcy model. Heat transfer coefficient of porous metal fins can be predicted within an error of 10% by our model. The predictive model has two assumptions. One is that the perimeter in the porous metal fin per cross-sectional area of porous metal fin is independent of the heights of fins and number of porous cells. Another assumption is that heat transfer coefficient of porous metal fin is also independent of the heights of fins and number of porous cells as long as the velocity is same.