紧凑通道内CO2/润滑油混合物沸腾换热特性研究

doi:10.11949/j.issn.0438-1157.20181442

摘要/Abstract

摘要：

为了测试润滑油对二氧化碳流动沸腾换热特性的影响，对外径6 mm、内径4 mm紧凑通道内的CO₂/润滑油混合物的换热进行实验研究。实验工况为质量流量2.74～5.61 kg·h^-1,饱和温度-4～8℃，热通量3.2～5 kW·m^-2，油浓度0～6%。结果表明：润滑油浓度越大，CO₂的局部传热系数越小；含1.5%油浓度相对于无油工况下平均传热系数下降了约42.4%; 传热系数随热通量、饱和温度的升高而增加，干涸后随着质量流量的增加传热系数增加；干涸随油浓度的增加、热通量的减小、饱和温度的升高、质量流量的增加而延迟；干涸特性对传热系数有显著影响，干涸阶段占整个换热过程的35.4%。

关键词: 二氧化碳, 润滑油, 传热, 混合物, 紧凑通道, 干涸特性

Abstract:

To test the effect of lubricating oil on the boiling heat transfer characteristics of carbon dioxide flow, the heat transfer of CO₂/lubricating oil mixture in a compact channel with an outer diameter of 6 mm and an inner diameter of 4 mm was experimentally studied at mass flow rate of 2.74—5.61 kg·h^-1, saturation temperature of -4—8℃, heat flux of 3.2—5 kW·m^-2 and oil concentration of 0—6%. The results show that the higher the concentration of lubricating oil, the smaller the local heat transfer coefficient of CO₂ and the delay of dryout. The average heat transfer coefficient with 1.5% oil concentration was reduced by about 42.4% compared with that without oil. With the increase of mass flow rate, the initial dryness of drying increased, and the heat transfer coefficient increased with the increase of mass flow rate. The heat transfer coefficient increases with the increase of heat flux and saturation temperature. Dryout is delayed with decreasing heat flux and increasing saturation temperature. Dryout characteristics have significant influence on heat transfer coefficient, and dryout stage accounts for 35.4% of the whole heat transfer process.

Key words: carbon dioxide, lubricating oil, heat transfer, mixtures, compact channel, dryout characteristics

中图分类号:

TK 12

杨俊兰, 宁淑英. 紧凑通道内CO₂/润滑油混合物沸腾换热特性研究[J]. 化工学报, 2019, 70(5): 1772-1778.

Junlan YANG, Shuying NING. Study on boiling heat transfer characteristics of CO₂/ lubricating oil mixture in mini-channel tube[J]. CIESC Journal, 2019, 70(5): 1772-1778.

图/表 8

图1 实验系统原理

Fig.1 Principle diagram of experimental system

图2 测试段及测试管

Fig.2 Test section and test tube

表1 设备特性

Table 1 Device characteristics

设备	型号	测试精度	规格
注油器	自制	± 0.1ml	>10 MPa
Pt热电阻	HH-WZPK	± 0.01℃	-200~500℃
压力传感器	CS-pt100	± 0.5%FS	0~10 MPa
质量流量计	HQ915	± 0.3	0~9 kg·h^-1

图3 不同干度下油浓度对传热系数的影响

Fig.3 Influence of oil concentrations on heat transfer coefficient with different dryness

图4 饱和温度对传热系数的影响

Fig.4 Influence of saturation temperature on heat transfer coefficient

图5 热通量对传热系数的影响

Fig.5 Influence of heat flux on heat transfer coefficient

图6 质量流量对传热系数的影响

Fig.6 Influence of mass flow rate on heat transfer coefficient

表2 不同换热过程平均传热系数对比

Table 2 Comparison of average heat transfer coefficients in different heat transfer processes

总过程平均传热系数/(kW·m^-2·K^-1)	干涸前平均传热系数/(kW·m^-2·K^-1)	干涸过程平均传热系数/(kW·m^-2·K^-1)	干涸后平均传热系数/(kW·m^-2·K^-1)
2.726	4.047	2.796	1.083
1.506	2.132	1.699	0.869
1.584	2.621	1.841	0.595
2.678	4.338	2.524	0.636
平均影响因子	0.515	0.354	0.131

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紧凑通道内CO₂/润滑油混合物沸腾换热特性研究

Study on boiling heat transfer characteristics of CO₂/ lubricating oil mixture in mini-channel tube

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