Paper Submission
03. Electronics Packaging and Thermal Management
Effect of channel size on operational characteristics of a horizontally-oriented polymer pulsating heat pipe
A pulsating heat pipe (PHP) is a kind of heat pipe, which transports heat passively by utilizing an oscillatory flow of liquid slugs and vapor plugs that is self-induced in the PHP channel. In the authors’ previous study, unique oscillation characteristics of liquid slugs and vapor plugs were found in a horizontally-oriented polymer PHP. Unlike conventional PHPs, liquid slugs were merged, and long liquid slugs were found on the condenser side of the PHP. At the same time, the evaporator section was occupied with long vapor plugs, and the periodic oscillations of long liquid slugs and long vapor plugs were confirmed in the polymer PHP. The PHP was fabricated by using acrylonitrile butadiene styrene polymer. Hydrofluoroether (HFE) - 7100 was used as a working fluid. The cross-section of the PHP channel was 1.3 mm wide and 1.1 mm high; thus, the hydraulic diameter of the channel was 1.2 mm. In the present study, extended experiments were conducted by changing the cross-sectional size of the PHP channel. The same polymer PHP was employed with HFE-7100 as the working fluid. The filling ratio of the working fluid was 60% of the total inner volume of the PHP channel. The experiments were conducted by changing the hydraulic diameter from 0.5 to 3.5. Flow patterns in the PHP were captured by using a high-speed camera, and temperature distributions of the PHP were obtained by using thermocouples. The flow patterns were analysed with the temperature distributions, and the effect of the channel size was discussed.
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Author Information
Mr.
Zhengyuan Pei
Presenting author
Mr.
Yohei Akaboshi
Prof.
Yasushi Koito
Corresponding author