每年出版 4 期
ISSN 打印: 2151-7975
ISSN 在线: 2151-7991
EXPERIMENTAL STUDY ON PULSATING HEAT PIPE USING SELF-REWETTING FLUID AS A WORKING FLUID: VISUALIZATION OF THIN LIQUID FILM AND SURFACE WAVE
摘要
Pulsating heat pipes (PHPs) are a new type of efficient heat transfer for small devices, which were introduced in the mid-1990s by H. Akachi. PHPs can be used to cool electronics by eliminating high heat flux. In this study, flow visualization was conducted for an open-loop PHP using a high-speed camera. The PHP was composed of a glass tube with an internal diameter of 1.8 mm, heated by an electric heater and cooled by water at a constant temperature. The evaporator had 10 rotations and 20 channels. The working fluid employed was comprised of a self-rewetting fluid, water, and ethanol. The self-rewetting fluid was a dilute aqueous solution of alcohols with a large number of carbon atoms (such as butanol and pentanol). These solutions can be considered as self-rewetting fluids because such fluids display nonlinear dependence of the surface tension with temperature. The results indicated that the working fluid characteristics had a strong influence on the performance. When using self-rewetting fluid as the working fluid, the temperature of the adiabatic section was higher than that of the water. Moreover, a peculiar wavy, thin layer of water was observed on the wall of the channel.
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FUMOTO Koji, ISHIDA Takuya, KAWANAMI Tsuyoshi, INAMURA Takao, Effect of working fluid in heat transport characteristics of pulsating heat pipe, Transactions of the JSME (in Japanese), 82, 834, 2016. Crossref
-
Batson W., Agnon Y., Oron A., Thermocapillary modulation of self-rewetting films, Journal of Fluid Mechanics, 819, 2017. Crossref
-
Yu Z., Thermocapillary instability of self-rewetting films on vertical fibers, Physics of Fluids, 30, 8, 2018. Crossref
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Fumoto Koji, Sasa Misaki, Okabe Takahiro, Savino Raffaele, Inamura Takao, Shirota Minori, Research on Heat Transfer Performance of the Open-Loop Micro Pulsating Heat Pipe with Self-Rewetting Fluids, Microgravity Science and Technology, 31, 3, 2019. Crossref
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Fumoto Koji, Yamagami Koki, Ishi Keiko, Fundamental Study on Heat Transport Device for Effective Utilization of Unused Heat, Tetsu-to-Hagane, 106, 8, 2020. Crossref