Performance of pulsating heat pipe with rising and declining heat flux

doi:10.16085/j.issn.1000-6613.2022-0910

Abstract

Abstract:

Pulsating heat pipe (PHP), as an effective heat transfer unit, has been widely applied in thermal management, due to its merit of flexible structure. The performance of PHP is critical for efficiency and safety in operation. Operation conditions are influential on the improvement of heat transfer performance of PHP. The operating characteristics of PHP with low heat flux were experimentally studied with deionized water as working medium. The filling ratio was designated as 30%—40%, balancing the availability of start-up at low heat flux and the endurance of operation at high heat flux. The results showed that the thermal resistance had a reverse law in the processes of rising and falling heat flux, because of the differences of the status of working media and the mode of heat transfer before and after start-up. At the same heat input, the thermal resistance of falling section was significantly lower than that of rising section. Close to the start-up region, the reverse trend of resistance became more significant. The thermal resistance of the PHP with 40% decreased by 0.777K/W and 0.546K/W in the falling heat flux section (11.7W) compared with the rising heat flux section under natural cooling or forced cooling. The thermal resistance of PHP with 30% decreased by 0.259K/W in the descending section (7W) under natural cooling, and 0.093K/W in the descending section (10W) under forced cooling. The results offered a preliminarily verified proposal to performance improvement for OHP operating under low heat flux and in weak cooling mode.

Key words: pulsating heat pipe (PHP), rising and declining heat flux, thermal resistance, hysteresis, filling ratio

摘要：

作为一种高效的传热元件，脉动热管由于其结构柔韧性，在微小空间和复杂形状中的热管理和设备散热中具有广泛的应用。脉动热管的热性能对于设备效率和安全性有重要的影响，而操作条件和运行模式对热管性能的改善有显著作用。本文针对脉动热管在升降热流条件下的性能进行实验测试，采用水为工质，30%～40%充液率，结果表明，热管在低热流、弱冷却条件下易于遭受启动失败和热失控的风险；在升降热流条件下，脉动热管的热阻在启动前后的变化趋势存在反向规律。由于热管在启动前后的工质状态不同，热流升降对于工质状态变化的影响受限于热惰性和迟滞现象，继而导致热阻变化规律的差异。热管负荷相同，若热管未启动，上升段热阻低于下降段；当热管启动运行时，下降段热阻低于上升段；热管负荷越远离启动临界值，升降热流条件下的热阻差异越小。相较于低充液率，热管在高充液率时的热阻反向规律更显著；热管在自然冷却时的热阻反向规律更显著于强制冷却。

关键词: 脉动热管, 升降热流, 热阻, 迟滞圈, 充液率

CLC Number:

TK172.4

YU Junsheng, ZHU Ye, LI Qiankun, XU Shixuan, ZHANG Xinyang, WANG Cheng, QU Jian. Performance of pulsating heat pipe with rising and declining heat flux[J]. Chemical Industry and Engineering Progress, 2023, 42(3): 1178-1186.

余俊声, 朱晔, 李乾坤, 徐士轩, 张昕阳, 汪城, 屈健. 升降热流条件下的脉动热管性能[J]. 化工进展, 2023, 42(3): 1178-1186.

Figures/Tables 9

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加热功率/W
充液率40%		充液率30%
自然冷却	强制冷却	自然冷却	强制冷却
1.28	1.28	2	3
5.16	5.16	4	5
11.7	11.7	7	10
20.72	20.72	8	13
26.37	26.37	9	15
20.72	32.5	10	20
11.7	26.37	9	15
5.16	20.72	8	13
1.28	11.7	7	10
	5.16	4	5
	1.28	2	3

加热功率/W
充液率40%		充液率30%
自然冷却	强制冷却	自然冷却	强制冷却
1.28	1.28	2	3
5.16	5.16	4	5
11.7	11.7	7	10
20.72	20.72	8	13
26.37	26.37	9	15
20.72	32.5	10	20
11.7	26.37	9	15
5.16	20.72	8	13
1.28	11.7	7	10
	5.16	4	5
	1.28	2	3

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