Experimental investigation on characteristics of R290 boiling heat transfer in horizontal micro-fin tubes with small diameter

doi:10.11949/0438-1157.20190646

Abstract

Abstract:

The boiling heat transfer characteristics of R290 in horizontal micro-fin copper tubes with inner diameter of 4mm and 6mm were investigated experimentally. And the effects of mass flux(100—250 kg·m^-2·s^-1),saturation temperature(7—11℃),heat flux(13—24 kW·m^-2) ,tube type and vapor quality(0.1—0.9) on the boiling heat transfer coefficient and critical quality were analyzed .The results showed that the boiling heat transfer coefficient increased with the increase of mass flux or saturation temperature. The boiling heat transfer coefficient increased at first but then decreased as the increase of heat flux. And the results also showed that critical quality decreased with the increase of heat flux. Comparing to the smooth tube, micro-fin had a larger critical quality. With the increase of vapor quality accompanied by the heat absorbing boiling process of R290, the boiling heat transfer coefficient increased at first but then decreased. Six commonly used correlations of boiling heat transfer were used to predict the boiling heat transfer coefficient of R290. Comparing with the experimental results, the prediction accuracy of Fanget al. and Choiet al. was higher.

Key words: R290, micro-fin tube, boiling, phase change, flow, heat transfer, prediction

摘要：

实验研究小管径水平微肋管内R290的两相流沸腾传热特性，分别在内径为4、6 mm，有效长度为900 mm的紫铜管内，得到R290在质量流量密度100～250 kg·m^-2·s^-1、饱和温度7～11℃、热通量13～24 kW·m^-2以及干度0.1～0.9范围内的沸腾传热系数；分析了质量流量密度、饱和温度、热通量、管型以及干度对R290沸腾传热系数及临界干度的影响。结果发现：沸腾传热系数随质量流量密度、饱和温度的增大而增加；随着热通量的增大，传热系数出现先增后减的现象；热通量越高，临界干度越小；微肋管相比于光滑管临界干度更大；且随着R290的沸腾汽化，干度逐渐增大并出现干涸现象，导致沸腾传热系数先增至一极值后降低。分别采用6种常用的沸腾传热关联式预测R290的沸腾传热系数，对比实验结果得出Fang等和Choi等的预测精度比较高。

关键词: R290, 微肋管, 沸腾, 相变, 流动, 传热, 预测

CLC Number:

TB 6

Lele WANG, Yuande DAI, Siyao TIAN, Qinhan LIN. Experimental investigation on characteristics of R290 boiling heat transfer in horizontal micro-fin tubes with small diameter[J]. CIESC Journal, 2020, 71(3): 1026-1034.

王乐乐, 戴源德, 田思瑶, 林秦汉. R290在小管径水平微肋管内沸腾传热的实验研究[J]. 化工学报, 2020, 71(3): 1026-1034.

Figures/Tables 12

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测量参数	测量仪表及型号	测量范围	误差
质量流量m_ref/(kg·h^-1)	DMF-1-1A/DX 科氏质量流量计	0~40	±0.2%
体积流量V_w/(L·min^-1)	LDY-S 电磁流量计	0.05～3.50	±0.5%
工质温度t_sat/℃	Pt100 电阻温度计	-50~200	±0.1℃
内管外壁温t_wo/℃	TT-T-30-SLE T型热电偶	-200~150	±0.1℃
压力p/MPa	Trafan8251 压力传感器	0～6	±0.3%

测量参数	测量仪表及型号	测量范围	误差
质量流量m_ref/(kg·h^-1)	DMF-1-1A/DX 科氏质量流量计	0~40	±0.2%
体积流量V_w/(L·min^-1)	LDY-S 电磁流量计	0.05～3.50	±0.5%
工质温度t_sat/℃	Pt100 电阻温度计	-50~200	±0.1℃
内管外壁温t_wo/℃	TT-T-30-SLE T型热电偶	-200~150	±0.1℃
压力p/MPa	Trafan8251 压力传感器	0～6	±0.3%

外径d_o/mm	内径d_i/mm	总壁厚δ/mm	底壁厚δ_w/mm	齿顶高度H_f/mm	齿顶角α/(°)	螺纹条数n	螺旋角β/(°)
5.00	4.00±0.03	0.50	0.35±0.03	0.15±0.02	40±5	65	18±2
7.00	6.00±0.03	0.50	0.35±0.03	0.15±0.02	40±5	65	18±2

外径d_o/mm	内径d_i/mm	总壁厚δ/mm	底壁厚δ_w/mm	齿顶高度H_f/mm	齿顶角α/(°)	螺纹条数n	螺旋角β/(°)
5.00	4.00±0.03	0.50	0.35±0.03	0.15±0.02	40±5	65	18±2
7.00	6.00±0.03	0.50	0.35±0.03	0.15±0.02	40±5	65	18±2

测试编号		体积流量/(L·min^-1)	进口温度/℃	出口温度/℃	比热容/(kJ·kg^-1·℃^-1)	密度/(kg·m^-3)	漏热率/%
1	热水	1.673	52.4	43.5	4.181	988.91	2.82
1	冷水	2.210	23.7	30.2	4.181	996.49	2.82
2	热水	1.552	53.2	43.3	4.181	988.78	2.30
2	冷水	2.224	24.0	30.7	4.181	996.38	2.30
3	热水	1.486	52.8	43.9	4.181	988.73	2.25
3	冷水	2.103	23.4	29.5	4.181	996.62	2.25