Mode identification of pool boiling of water by acoustic emission

被引：0
|
作者：
Zhang, Qing [1 ]
Dong, Kezeng [1 ]
Huang, Zhengliang [1 ]
Wang, Jingdai [1 ]
Yang, Yongrong [1 ]
机构：
[1] State Key Laboratory of Chemical Engineering, Department of Chemical and Biochemical Engineering, Zhejiang University, Hangzhou 310027, Zhejiang
来源：
Huagong Xuebao/CIESC Journal | 2013年 / 64卷 / 10期
关键词：
Acoustic emission; Dominant frequency; Gas-liquid flow; Heat transfer; Nucleate boiling; Nucleation; Pool boiling of water;
D O I：
10.3969/j.issn.0438-1157.2013.10.006
中图分类号：
学科分类号：
摘要：
Based on acoustic emission technique, the acoustic signals during pool boiling of water were measured and the relationship between boiling modes and acoustic signal characteristics was investigated by time-domain and frequency-domain analysis. The results showed that the values of acoustic energy, standard deviation (STD) and average absolute deviation (AAD) indicated extreme points when the boiling mode changed from natural convection to nucleate boiling at an excess temperature of 5°C. After transition boiling began at excess temperature of 30°C, the values of acoustic energy, STD and AAD changed irregularly. As excess temperature increased, the dominant frequency of acoustic signals showed two step decreases, at which excess temperatures were the turning points from natural convection to nucleate boiling and from nucleate boiling to transition boiling, respectively. Therefore, the step change of dominant frequency could be used as a criterion to identify the emergences of nucleate boiling and transition boiling. In comparison with the work published before, this work investigated transition boiling as well as natural convection and nucleate boiling. The criterion to determine boiling mode transition is proposed. Compared with conventional methods, this method was relatively fast, sensitive, accurate, non-intrusive and real-time online. © All Rights Reserved.
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页码：3527 / 3533
页数：6
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