Heat transfer performance of pulsating heat pipe with hygroscopic salt solution

doi:10.11949/j.issn.0438-1157.20180661

Abstract

Abstract:

The heat transfer characteristics of the 10% (mass) concentration LiCl hygroscopic salt solution as the oscillating heat pipe of the working fluid were studied. The 10% LiCl salt solution was prepared to test the PHP evaporator section temperature and the thermal resistance at 45%—90% filling rate and 10—100 W heating power. Besides, that of deionized water PHP was compared. The results show that at the low filling rate of 45% and 55%, when the heating power reaches over 50 W, the thermal resistance of LiCl solution pulsating heat pipe is obviously lower than that of the deionized water PHP. LiCl solution can effectively delay the occurrence of dry-out phenomenon and reduce the thermal resistance of the PHP. At the filling rate of 62%, when the heating power reaches over 35 W, the evaporator section temperature curve of LiCl solution PHP has higher oscillation frequency and smaller oscillation amplitude. The thermal resistance of LiCl solution PHP at different heat power is lower than that of the deionized water PHP. At the high filling rate of 80% and 90%, the temperature curves of the evaporator section of the two types of PHP are similar for the average temperature, the oscillation frequency and the amplitude. The thermal resistance is relatively close.

Key words: pulsating heat pipe, lithium chloride, salt solution, evaporation, heat transfer, binary mixture

摘要：

研究了10%(质量分数)LiCl吸湿性盐溶液作为工质的振荡热管传热特性。测试了在45％～90％充液率、10～100 W加热功率下振荡热管蒸发端温度及热阻的变化，并与去离子水工质的实验数据进行了对比。结果表明：在45％、55％的低充液率下，加热功率达到50 W以上时，LiCl溶液振荡热管的热阻明显比去离子水振荡热管低，能有效延迟烧干现象的发生。在62%的中等充液率，35W加热功率以上，LiCl溶液振荡热管的蒸发端温度较离子水振荡热管振荡频率快，幅度小且热阻低。在80%、90%的高充液率下，两种工质振荡热管的蒸发端温度曲线在平均温度、振荡频率、振荡幅度上都较为相似，热阻也比较接近。

关键词: 振荡热管, LiCl, 盐溶液, 蒸发, 传热, 二元混合物

CLC Number:

TK 124

Hang ZHANG, Jianhua WENG, Xiaoyu CUI. Heat transfer performance of pulsating heat pipe with hygroscopic salt solution[J]. CIESC Journal, 2019, 70(3): 874-882.

张航, 翁建华, 崔晓钰. 吸湿性盐溶液振荡热管的传热特性研究[J]. 化工学报, 2019, 70(3): 874-882.

Figures/Tables 16

Fig.1 Schematic diagram of experimental system of PHP

Fig.2 PHP prototype and thermocouple arrangement

Table 1 Physical properties of working fluids at standard atmospheric pressure and 20℃

工质	沸点/℃	密度/(kg·m^-3)	热导率/(W·(m·℃) ^-1)	动力黏度η×10⁶/(Pa·s)	表面张力σ×10³/(N·m^-1)
水	100.0	998	0.599	1.01	72.8
10%LiCl溶液	103.3	1053	0.573	2.63	75.2

Fig.3 Temperature oscillation curves at low charge rate evaporation end

Fig.4 Temperature change curves at 45%, 55% low charge rate evaporation end

Fig.5 Temperature oscillation curves at 62% charge rate evaporation end

Fig.6 Temperature change curves at 62%, 70% medium charge rate evaporation end

Fig.7 Temperature oscillation curves at 80% charge rate evaporation end

Fig.8 Temperature oscillation curves at 90% charge rate evaporation end

Fig.9 Temperature changes curve at 80%,90% high charge rate evaporation end

Fig.10 Temperature change curves at 45%, 55% low charge rate condensation end

Fig.11 Temperature change curves at 62%, 70% charge rate condensation end

Fig.12 Temperature change curves at 80%,90% high charge rate condensation end

Fig.13 Thermal resistance change curves at 45%, 55% low charge rate

Fig.14 Thermal resistance change curves at 62%、70% medium charge rate

Fig.15 Thermal resistance change curves at 80%,90% high charge rate

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