相变微胶囊悬浮液喷淋换热特性实验研究

doi:10.11949/0438-1157.20220192

摘要/Abstract

摘要：

根据相变微胶囊储存和释放潜热的特殊性质，分别使用相变微胶囊悬浮液（MPCMS）和纯水作为喷淋介质，搭建了一个小型喷淋塔装置，其中相变微胶囊的芯材为正二十二烷(C₂₂H₄₆)。实验设定了五个喷淋温度(35、40、44、47、51℃)、三个空气流量(0.011、0.018、0.025 m³/s)和两种直径(SMD=80、240 μm)的大、小液滴作为实验变量，探究了上述两种介质与空气之间的换热特性。实验结果表明：相变微胶囊的过冷会影响换热过程。常温常湿条件下，对于小液滴，当空气流量为0.018、0.025 m³/s时，喷淋温度为44、47℃的MPCMS比相同温度下的纯水更能促进换热；当空气流量为0.011 m³/s时，喷淋温度为44℃的MPCMS比相同温度下的纯水更能促进换热。对于大液滴，在三种空气流量下，喷淋温度为44℃的MPCMS比相同温度下的纯水作为喷淋介质时换热效果更好。

关键词: 相变微胶囊悬浮液, 喷淋, 粒子, 对流, 传热, 过冷

Abstract:

According to the special properties of microencapsulated phase change material to store and release latent heat, microencapsulated phase change material suspension (MPCMS) and pure water were used as spray media respectively to build a small spray tower device, in which the core material of microencapsulated phase change material is n-dodecane (C₂₂H₄₆). Five spray temperatures (35, 40, 44, 47, 51℃), three air flows (0.011, 0.018, 0.025 m³/s) and two diameters (SMD=80, 240 μm) were set as experimental variables. The heat transfer characteristics between the two media that described and air were investigated. The experimental results show that the supercooling of the phase change microcapsules will affect the heat transfer process. Under normal temperature and humidity, for small droplets, when the air flow rate is 0.018 and 0.025 m³/s, MPCMS at 44 and 47℃ can promote heat transfer better than pure water at the same temperature. When air flow rate is 0.011 m³/s, MPCMS at 44℃ can promote heat transfer better than pure water at the same temperature. For large droplets, MPCMS with spraying temperature of 44℃ has better heat transfer effect than pure water with spraying medium at the same temperature under three kinds of air flow.

Key words: microencapsulated phase change material suspension, spray, particle, convection, heat transfer, supercooling

中图分类号:

TB 61⁺1

董彬, 薛永浩, 梁坤峰, 袁争印, 王林, 周训. 相变微胶囊悬浮液喷淋换热特性实验研究[J]. 化工学报, 2022, 73(7): 2971-2981.

Bin DONG, Yonghao XUE, Kunfeng LIANG, Zhengyin YUAN, Lin WANG, Xun ZHOU. Experimental study on spray heat transfer characteristics of microencapsulated phase change material suspension[J]. CIESC Journal, 2022, 73(7): 2971-2981.

图/表 11

图1 静态换热测试装置1—恒温槽； 2—保温桶； 3—换热盘管； 4—搅拌器； 5—试管； 6—计算机；7—安捷伦数据采集仪

Fig.1 Static heat transfer test device

图2 喷淋系统装置1—水泵；2—保温桶；3—温控开关；4—加热棒；5—湿度采集器；6—整流器；7—水泵；8—安捷伦数据采集仪；9—电磁流量计；10—计算机；11—喷头；12—压力传感器；13—排气扇；14—功率控制仪；15—水箱；16—浮球阀

Fig.2 Sprinkler system device

图3 比热容随温度的变化关系

Fig.3 Relationship between specific heat capacity and temperature

表1 实验条件

Table 1 Experimental conditions

喷淋介质	SMD/μm	喷淋温度/℃	空气流量/(m³/s)
纯水、MPCMS	80、240	35、40、44、47、51	0.011、0.018、0.025

图4 热成像图片（SMD=80 μm，qv=0.018 m3/s）(a)~(c) 纯水，常温常湿；(d)~(f) 纯水，高温高湿；(g)~(i) MPCMS，常温常湿；(j)~(l) MPCMS，高温高湿

Fig.4 Thermal image (SMD=80 μm，qv=0.018 m3/s)

图5 纯水与MPCMS的温度变化情况

Fig.5 Temperature changes of pure water and MPCMS

图6 液体温度随喷淋温度的变化情况

Fig.6 Liquid temperature changes with spray temperature

图7 液体期的能量随喷淋温度的变化情况

Fig.7 Change of fluid and air energy with spray temperature

图8 空气进出口焓差随喷淋温度的变化

Fig.8 The change of air inlet and outlet enthalpy with spray temperature

图9 MPCMS的等效比热容和温度的变化情况(qv1=0.011 m3/s, qv2=0.018 m3/s， qv3=0.025 m3/s)

Fig.9 MPCMS equivalent specific heat capacity and temperature variation

图10 Le随温度的变化情况

Fig.10 The change of Le with temperature

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