Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2010, Vol. 21 ›› Issue (5): 316-320 doi: 10.13538/j.1001-8042/nst.21.316-320

• NUCLEAR ENGINEERING • Previous Articles    

Phase identification by a novel needle-contact capacitance probe in gas-liquid two-phase flows

HUANG Shanfang1,2,* LU Jun3 ZHANG Bingdong 2 WANG Dong 2   

  1. 1Department of Engineering Physics, Tsinghua University, Beijing 100084, China 2State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi′an 710049, China 3Beijing Aerospace Institute for Metrology and Measurement Technology, Beijing 100076, China
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HUANG Shanfang, LU Jun, ZHANG Bingdong, WANG Dong . Phase identification by a novel needle-contact capacitance probe in gas-liquid two-phase flows.Nuclear Science and Techniques, 2010, 21(5): 316-320     doi: 10.13538/j.1001-8042/nst.21.316-320

Abstract:

In this paper, we propose a novel probe to identify phases in any two-phase flows where one phase is conductive and the other nonconductive. We can further obtain many parameters such as void fraction, bubble velocity, and interfacial area concentration. Compared with the traditional probe, the novel probe has unique advantages that it is less dependent on water conductance or distance between the electrodes, and that the amplitude is bigger between high and low levels. Theoretical analyses showed that the measurement error became higher when water conductance decreases or distance increases, which is consistent with the theoretical analyses. Experimental results showed that the output signal kept constant with salt content of 0−5% and electrode distance of 0−30 mm in tap water. The level difference was up to 6.4 V, resulting in identifying two phases easily. Time traces of phase identification were completely consistent with the flow structures.

Key words: Needle-contact capacitance probe, Phase identification, Flow structure