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[1] Kong Lingjian, Han Jitian, Chen Changnian, Liu Zhigang, et al. Experimental study of the onset of nucleate boiling invertical helically-coiled tubes [J]. Journal of Southeast University (English Edition), 2018, 34 (3): 402-407. [doi:10.3969/j.issn.1003-7985.2018.03.017]
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Experimental study of the onset of nucleate boiling invertical helically-coiled tubes()
立式螺旋管内过冷沸腾起始点实验研究

Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:
34
Issue:
2018 3
Page:
402-407
Research Field:
Energy and Power Engineering
Publishing date:
2018-09-20

Info

Title:
Experimental study of the onset of nucleate boiling invertical helically-coiled tubes
立式螺旋管内过冷沸腾起始点实验研究
Author(s):
Kong Lingjian1, Han Jitian2, Chen Changnian2, Liu Zhigang1
1Energy Research Institute of Shandong Academy Sciences, Jinan 250014, China
2School of Energy and Power Engineering, Shandong University, Jinan 250061, China
孔令健1, 韩吉田2, 陈常念2, 刘志刚1
1山东省科学院能源研究所, 济南 250014; 2山东大学能源与动力工程学院, 济南 250061
Keywords:
two-phase flow;  subcooled flow boiling;  onset of nucleate boiling;  helical coil
两相流;  过冷沸腾;  沸腾起始点;  螺旋管
PACS:
TK121
DOI:
10.3969/j.issn.1003-7985.2018.03.017
Abstract:
The experiments of the onset of nucleate boiling using R134a as working fluid were conducted in vertical helically-coiled tubes. The experiments were carried out with a range of pressure from 450 to 850 kPa, inlet subcooling from 4.7 to 15.0 ℃, heat flux from 0.11 to 8.9 kW/m2 and mass flux from 218.2 to 443.7 kg/(m2·s). The heat flux, superheat and temperature undershoot at the ONB are analyzed in vertical helically-coiled tubes. Also, the effects of mass flux, system pressure, inlet subcooling and geometric parameters on the ONB are studied. The results demonstrate that the inception heat flux and superheat increase with increasing mass flux and inlet subcooling, but decrease with increasing system pressure and helix diameter. The pitch of the helical coil has a slight effect on the wall superheat and heat flux at the ONB. The correlation of heat flux at the ONB of subcooled flow boiling in helical coil is developed based on the experimental data, and it shows a good agreement with the experimental data.
以R134a为工质, 对立式螺旋管内过冷沸腾起始点进行了实验研究.实验参数范围为:压力450~850 kPa, 入口过冷度4.7~15.0 ℃, 热流密度0.11~8.9 kW/m2, 质量流量218.2 to 443.7 kg/(m2·s).对立式螺旋管内过冷沸腾起始点的热流密度、过热度和温度下降幅度进行了分析, 研究了质量流量、系统压力、入口过冷度和螺旋管几何参数对过冷沸腾起始点的影响.实验结果表明:过冷沸腾起始点的热流密度和过热度随着质量流量和入口过冷度的增大而增大, 但是随着系统压力和螺旋直径的增大而减小;螺旋节距对过冷沸腾起始点的热流密度和过热度的影响很小.基于实验数据提出了螺旋管内过冷沸腾起始点热流密度的关联式, 且该关联式的预测精度较高.

References:

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Memo

Memo:
Biographies: Kong Lingjian(1986—), male, doctor; Han Jitian(corresponding author), male, doctor, professor, jthan@sdu.edu.cn.
Foundation items: The National Natural Science Foundation of China(No. 50776055, 51076084), the Natural Science Foundation of Shandong Province(No.ZR2016YL005).
Citation: Kong Lingjian, Han Jitian, Chen Changnian, et al.Experimental study of the onset of nucleate boiling in vertical helically-coiled tubes[J].Journal of Southeast University(English Edition), 2018, 34(3):402-407.DOI:10.3969/j.issn.1003-7985.2018.03.017.
Last Update: 2018-09-20