C形脉动热管启动和传热特性试验研究

doi:10.6040/j.issn.1672-3961.0.2024.326

摘要/Abstract

摘要： 以丙酮、无水乙醇、去离子水、甲醇以及丙酮-甲醇混合物为工质,研究不同加热功率(30~270 W)和充液率(30%~80%)下C形脉动热管(pulsating heat pipe, PHP)的传热性能。结果表明:在试验参数范围内,丙酮和甲醇作为工质时,C形PHP表现出优异的流型转变速度和启动性能,热阻随加热功率的增加总体呈下降趋势,但功率增加对热阻的改善存在明显的边际效应。热阻在不同功率区间表现出明显的充液率依赖特性,C形PHP的最佳充液率应根据实际的工作功率进行选择,以实现最优传热效果。在PHP未启动阶段,功率上升过程的热阻略低于下降过程;启动后,功率上升过程的热阻略高于下降过程,当充液率由50%增加到60%后,这一差异得到抑制。

关键词: 脉动热管, 传热, 流动, 试验验证, 传热分析

Abstract: The heat transfer performance of a C-shaped pulsating heat pipe(PHP)was experimentally investigated using acetone, absolute ethanol, deionized water, methanol, and an acetone-methanol mixture as working fluids. The experiments were conducted under varying heating powers(ranging from 30 W to 270 W)and filling ratios(ranging from 30% to 80%). The results indicated that within the experimental parameter range, the C-shaped PHP exhibited excellent flow pattern transition speed and startup performance when acetone and methanol were used as working fluids. The thermal resistance generally showed a decreasing trend with the increase in heating power; however, the improvement of thermal resistance by power increment exhibited a significant marginal effect. Thermal resistance demonstrated obvious filling ratio-dependent characteristics in different power intervals. Thus, the optimal filling ratio of the C-shaped PHP should be selected based on the actual operating power to achieve the best heat transfer effect. In the pre-startup stage of the PHP, the thermal resistance during the power-up process was slightly lower than that during the power-down process. After startup, the thermal resistance during the power-up process became slightly higher than that during the power-down process. This difference was suppressed when the filling ratio increased from 50% to 60%.

Key words: pulsating heat pipe, heat transfer, flow, experimental validation, heat transfer analysis

中图分类号:

TK172.4

李新泽,洪瑞,杜文静. C形脉动热管启动和传热特性试验研究[J]. 山东大学学报 (工学版), 2026, 56(2): 166-174.

LI Xinze, HONG Rui, DU Wenjing. Experimental study on start-up and heat transfer characteristics of C-shaped pulsating heat pipe[J]. Journal of Shandong University(Engineering Science), 2026, 56(2): 166-174.

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