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Research Papers

Study on a Pulsating Heat Pipe With Self-Rewetting Fluid

[+] Author and Article Information
Koji Fumoto

Department of Mechanical Engineering, Kushiro National College of Technology, Otanoshike W2-32-1, Kushiro 0840916, Japanfumoto@mech.kushiro-ct.ac.jp

Masahiro Kawaji

Department of Chemical Engineering and Applied Chemistry, University of Toronto, 200 College Street, Toronto ON, M5S3E5, Canadakawaji@ecf.utoronto.ca

Tsuyoshi Kawanami

Department of Mechanical Engineering, Graduate School of Engineering, Kobe University, 1-1 Rokkodai-cho, Naka-ku, Kobe 6578501, Japankawanami@mech.kobe-u.ac.jp

J. Electron. Packag 132(3), 031005 (Sep 09, 2010) (4 pages) doi:10.1115/1.4001855 History: Received November 23, 2009; Revised April 25, 2010; Published September 09, 2010

This paper discusses a pulsating heat pipe (PHP) using a self-rewetting fluid. Unlike other common liquids, self-rewetting fluids have the property that the surface tension increases with temperature. The increasing surface tension at a higher temperature can cause the liquid to be drawn toward a heated surface if a dry spot appears and thus to improve boiling heat transfer. In experiments, 1-butanol and 1-pentanol were added to water at a concentration of less than 1 wt % to make self-rewetting fluid. A pulsating heat pipe made from an extruded multiport tube was partially filled with the self-rewetting fluid water mixture and tested for its heat transport capability at different input power levels. The experiments showed that the maximum heat transport capability was enhanced by a factor of 4 when the maximum heater temperature was limited to 110°C. Thus, the use of a self-rewetting fluid in a PHP was shown to be highly effective in improving the heat transport capability of pulsating heat pipes.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Experimental apparatus

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Figure 2

Aluminum tube used to construct a pulsating heat pipe

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Figure 3

Surface tension of water, 1-butanol, 1-pentanol, and its aqueous solution

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Figure 4

Maximum heater power obtained for different fill ratios (1-butanol)

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Figure 5

Maximum heater power obtained for different fill ratios (1-pentanol)

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Figure 6

Variation in PHP temperature for water and self-rewetting aqueous solution

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Figure 7

Variation in thermal resistance with heater power at different working fluids

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