Boiling incipience of subcooled water flowing in a narrow tube using wavelet analysis
Boiling incipience of subcooled water flowing in a narrow tube using wavelet analysis
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DOI：
10.1016/j.applthermaleng.2017.12.110
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发表时间：
2018-03
影响因子：
6.4
通讯作者：
M. Shibahara;K. Fukuda;Qiusheng Liu;K. Hata;S. Masuzaki
中科院分区：
文献类型：
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作者：
M. Shibahara;K. Fukuda;Qiusheng Liu;K. Hata;S. Masuzaki
实验观察了过冷水在均匀加热窄管内流动时的各种起沸现象。采用小波分解方法对沸腾信号进行了分析。用声级计测量了不同流速下窄管内过冷水的沸腾起始点。使用内径为1.0 mm的铂管作为实验管。实验管的长度为23.2mm。使用直流电通过焦耳效应加热管。入口温度和流速分别为285-346 K和2.5-14 m/s。随着热流密度的增加，表观沸点升高，直至达到始沸点。随着出口压力的增加，初始温度超调没有出现。由于现有的沸腾起始关联式低估了沸腾起始热流密度，根据实验数据得到了沸腾起始的半经验关联式。新关联式的预测值与实验值在± 30%以内符合。
Various incipient boiling phenomena for subcooled water flowing in a uniformly heated narrow tube were observed experimentally. The boiling signal was analyzed using the wavelet decomposition method. The boiling incipience of subcooled water in the narrow tube was recorded by a sound level meter at various flow velocities. A platinum tube was used as the experimental tube with an inner diameter of 1.0 mm. The length of the experimental tube was 23.2 mm. The tube was heated by the Joule effect using a direct current. The inlet temperature and flow velocities ranged 285–346 K and 2.5–14 m/s, respectively. The surface superheat ascended with an increase of the heat flux until the incipient boiling point was reached. The initial temperature overshoot did not appear as the outlet pressure increased. Since the existing correlations underestimated the incipient heat flux, a semi-empirical correlation of the boiling incipience was obtained based on the experimental data. The predicted value of the new correlation is in agreement with the experimental data within ±30%.