Measurement Method of Void Fraction in Narrow Channel Based on Two-step Morphological Image Method

PAN Liqiang; LIU Yang; LI Weihua; LIU Yefei

doi:10.7538/yzk.2018.youxian.0204

Atomic Energy Science and Technology > 2018 > 52(12): 2256-2262. > DOI: 10.7538/yzk.2018.youxian.0204

PAN Liqiang, LIU Yang, LI Weihua, LIU Yefei. Measurement Method of Void Fraction in Narrow Channel Based on Two-step Morphological Image Method[J]. Atomic Energy Science and Technology, 2018, 52(12): 2256-2262. DOI: 10.7538/yzk.2018.youxian.0204

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Measurement Method of Void Fraction in Narrow Channel Based on Two-step Morphological Image Method

Institute of Nuclear and New Energy Technology, Collaborative Innovation Center of Advanced Nuclear Energy Technology, Key Laboratory of Advanced Reactor Engineering and Safety of Ministry of Education, Tsinghua University, Beijing 100084, China

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Abstract

Void fraction is one of the basic parameters for the study on two-phase flow. For flow boiling conditions in the narrow channel, it is difficult to directly measure void fraction by using probes. Through high-speed photography, a measurement method of void fraction at the exit of the narrow channel was proposed in this paper, which was based on the two-step morphological image method. This method can solve the problem of recognition for the bubble boundary at the flow channel and obtain the instantaneous values of void fraction. The method has good adaptability for various flow patterns. Comparing with the time-averaged results calculated by the energy conservation method, the relative deviation is less than 17%. The accuracy and reliability of the method are verified.
- image method,
- narrow channel,
- void fraction,
- two-phase flow

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