1.Department of Engineering Physics, Tsinghua University, Beijing 100084, China
2.State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi′an 710049, China
3.Beijing Aerospace Institute for Metrology and Measurement Technology, Beijing 100076, China
Corresponding author. E-mail address: email@example.com
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Shanfang HUANG, Jun LU, Bingdong ZHANG, et al. Phase identification by a novel needle-contact capacitance probe in gas-liquid two-phase flows. [J]. Nuclear Science and Techniques 21(5):316-320(2010)
Shanfang HUANG, Jun LU, Bingdong ZHANG, et al. Phase identification by a novel needle-contact capacitance probe in gas-liquid two-phase flows. [J]. Nuclear Science and Techniques 21(5):316-320(2010) DOI： 10.13538/j.1001-8042/nst.21.316-320.
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.
Needle-contact capacitance probePhase identificationFlow structure
Fordham E J, Holmes A, Ramos R T, et al, Meas Sci Technol, 1999, 10: 1329-37.
Fordham E J, Simonian S, Ramos R T, et al, Meas Sci Technol, 1999, 10: 1338-46.
Fordham E J, Ramos R T, Holmes A, et al Meas Sci Technol, 1999, 10: 1347-52.
Gopal M, Jepson W P. Int J Multiphase Flow, 1997, 23: 945-65.
Angeli P, Hewitt G F. Int J Multiphase Flow, 2000, 26: 1117-40.
Hibiki T, Ho Lee T, Young Lee J I. Chem Eng Sci, 2006, 61: 7979-90.
Hazuku T, Takamasa T, Hibiki T. Int J Heat Mass Transfer, 2007, 50: 2986-95.
Zheng D H, Che D F. Int J Multiphase Flow, 2006, 32:1191-1218.
Prasser H M, Bottger A, Zschau J. Flow Meas Instru, 1998, 9: 111-119.
Prasser H M, Misawa M, Tiseanu I. Flow Meas Instru, 2005, 16:73-83.
Fagundes Netto J R, Fabre J, Peresson L. Int J Multiphase Flow, 1999, 25: 1129-60.
Huang S F, Zhang X G, Wang D, et al. Meas Sci Technol, 2007, 18: 3784-94.
Huang S F, Zhang X G, Wang D et al. Int J Multiphase Flow, 2008, 34:809-18.
Huang S F, Zhang B D, Lu J et al. Nucl Sci Techni, 2010, 21: 246-250.