化工学报 ›› 2022, Vol. 73 ›› Issue (7): 2971-2981.doi: 10.11949/0438-1157.20220192

• 流体力学与传递现象 • 上一篇    下一篇

相变微胶囊悬浮液喷淋换热特性实验研究

董彬1(),薛永浩1,梁坤峰1(),袁争印2,王林1,周训1   

  1. 1.河南科技大学先进制冷循环与热过程控制研究所，河南 洛阳 471003
    2.冈山大学大学院自然科学研究科，日本 冈山 700-8530
  • 收稿日期:2022-02-10 修回日期:2022-04-29 出版日期:2022-07-05 发布日期:2022-08-01
  • 通讯作者: 梁坤峰 E-mail:dongbin@haust.edu.cn;lkf@haust.edu.cn
  • 作者简介:董彬（1980—），男，讲师，dongbin@haust.edu.cn
  • 基金资助:
    国家自然科学基金项目(U1304521);河南省科技厅重点研发与推广专项（科技攻关）项目(212102210242)

Experimental study on spray heat transfer characteristics of microencapsulated phase change material suspension

Bin DONG1(),Yonghao XUE1,Kunfeng LIANG1(),Zhengyin YUAN2,Lin WANG1,Xun ZHOU1   

  1. 1.Advanced Refrigeration Cycle and Thermal Process Control Institute, Henan University of Science and Technology, Luoyang 471003, Henan, China
    2.Graduate School of Natural Science and Technology, Okayama University, Okayama 700-8530, Japan
  • Received:2022-02-10 Revised:2022-04-29 Published:2022-07-05 Online:2022-08-01
  • Contact: Kunfeng LIANG E-mail:dongbin@haust.edu.cn;lkf@haust.edu.cn

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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

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"

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"

图3

比热容随温度的变化关系"

表1

实验条件"

喷淋介质SMD/μm喷淋温度/℃空气流量/(m3/s)
纯水、MPCMS80、24035、40、44、47、510.011、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"

图5

纯水与MPCMS的温度变化情况"

图6

液体温度随喷淋温度的变化情况"

图7

液体期的能量随喷淋温度的变化情况"

图8

空气进出口焓差随喷淋温度的变化"

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)"

图10

Le随温度的变化情况"

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