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热管科学与技术

每年出版 4 

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

卷 6, 册 1-2, 2015, pp. 65-76
DOI: 10.1615/HeatPipeScieTech.2015013430
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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.

对本文的引用
  1. 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

  2. Batson W., Agnon Y., Oron A., Thermocapillary modulation of self-rewetting films, Journal of Fluid Mechanics, 819, 2017. Crossref

  3. Yu Z., Thermocapillary instability of self-rewetting films on vertical fibers, Physics of Fluids, 30, 8, 2018. Crossref

  4. 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

  5. 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

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