Shen, C; Zhang, S; Wei, S; Zhang, D; Cui, K; Tian, G; Song, G; (2025) An experimental study on the heat transfer performance of parallel-flat heat pipe with self-rewetting fluid. International Communications in Heat and Mass Transfer , 168 , Article 09424. 10.1016/j.icheatmasstransfer.2025.109424.

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Abstract

Self-Rewetting Fluid (SWF) is a unique solution whose surface tension initially decreases and then increases with rising temperature. This distinctive change in surface tension enables SWF to possess excellent wettability properties within a specific temperature range. The present study employs an n-butanol solution when using self-rewetting fluid in parallel-flat heat pipes (PFHP). This study examined the heat transfer performance of 3 wt%, 5 wt%, and 7 wt% n-butanol aqueous solutions, using PFHPs with 2 mm, 4 mm, and 6 mm widths, respectively. The performance of the PFHP was tested at inclination angles of 0°, 30°, 60° and 90°. The experimental results showed that comparing to pure water the PFHP filled with SWF had better heat transfer performance. The enhancement of heat transfer performance becomes more significant with higher concentrations of n-butanol solution. When the heat pipe operated steadily at a 90° tilt angle and 40 W heating power, 3 wt%, 5 wt%, and 7 wt% n-butanol solutions in 4 mm PFHP exhibited enhancement rates of 1.6 %, 9.0 %, and 31.0 %, respectively.

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