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CLC number: TB126

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Received: 2005-09-07

Revision Accepted: 2005-09-20

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Journal of Zhejiang University SCIENCE A 2005 Vol.6 No.12 P.1416~1419

http://doi.org/10.1631/jzus.2005.A1416


Study on absorption coefficients of dual-energy γ-rays in determining phase fractions of multiphase flows


Author(s):  Li Zhi-biao, Li Dong-hui, Wu Ying-xiang

Affiliation(s):  Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080, China; more

Corresponding email(s):   Lizb_2008@163.com

Key Words:  Absorption coefficient, &gamma, -rays, Dual-energy, Phase fraction


Li Zhi-biao, Li Dong-hui, Wu Ying-xiang. Study on absorption coefficients of dual-energy γ-rays in determining phase fractions of multiphase flows[J]. Journal of Zhejiang University Science A, 2005, 6(12): 1416~1419.

@article{title="Study on absorption coefficients of dual-energy γ-rays in determining phase fractions of multiphase flows",
author="Li Zhi-biao, Li Dong-hui, Wu Ying-xiang",
journal="Journal of Zhejiang University Science A",
volume="6",
number="12",
pages="1416~1419",
year="2005",
publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.2005.A1416"
}

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%T Study on absorption coefficients of dual-energy γ-rays in determining phase fractions of multiphase flows
%A Li Zhi-biao
%A Li Dong-hui
%A Wu Ying-xiang
%J Journal of Zhejiang University SCIENCE A
%V 6
%N 12
%P 1416~1419
%@ 1673-565X
%D 2005
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.2005.A1416

TY - JOUR
T1 - Study on absorption coefficients of dual-energy γ-rays in determining phase fractions of multiphase flows
A1 - Li Zhi-biao
A1 - Li Dong-hui
A1 - Wu Ying-xiang
J0 - Journal of Zhejiang University Science A
VL - 6
IS - 12
SP - 1416
EP - 1419
%@ 1673-565X
Y1 - 2005
PB - Zhejiang University Press & Springer
ER -
DOI - 10.1631/jzus.2005.A1416


Abstract: 
This paper discusses the principle and mathematical method to measure the phase fractions of multiphase flows by using a dual-energy gamma-ray system. The dual-energy gamma-ray device is composed of radioactive isotopes of 241Am and 137Cs with emission energies of 59.5 keV and 662 keV respectively. A rational method to calibrate the absorption coefficient was introduced in detail. The statistical error has been analyzed on the basis of the accurate absorption coefficient which enables determination phrase fractions almost independent of the flow regime. Improvement has been achieved on the measurement accuracy of phase fractions.

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article

Reference

[1] Abro, E., Johansen, G.A., 1999. Improved void fraction determination by means of multi-beam gamma-ray attenuation measurements. Flow Measurement and Instrumentation, 10:99-108.

[2] Boyer, C., Fanget, B., 2002. Measurement of liquid flow distribution in trickle bed reactor of large diameter with a new gamma-ray tomographic system. Chemical Engineering Science, 57:1079-1089.

[3] Chen, J.W., Gupta, P., Degaleesan, S., Al-Dahhan, M.H., Dudukovic, M.P., Toseland, B.A., 1998. Gas holdup distributions in large-diameter bubble columns measured by computed tomography. Flow Measurement and Instrumentation, 9:91-101.

[4] Grassler, T., Wirth, K.E., 2001. Dual-Energy X-Ray Tomography in Process Engineering—A Non-Intrusive Technique to Characterise Vertical Multiphase Flows. 2nd World Congress on Industrial Process Tomography, Hannover, Germany.

[5] Kemoun, A., Ong, B.C., Gupta, P., Al-Dahhan, M.H., Dudukovic, M.P., 2001. Gas holdup in bubble columns at elevated pressure via computed tomography. International Journal of Multiphase Flow, 27:929-946.

[6] Stahl, P., von Rohr, P.R., 2004. On the accuracy of void fraction measurements by single-beam gamma-densitometry for gas-liquid two-phase flows in pipes. Experimental Thermal and Fluid science, 28:533-544.

[7] Yin, F.H., Afacan, A., Nandakumar, K., Chuang, K.T., 2002. Liquid holdup distribution in packed columns: gamma ray tomography and CFD simulation. Chemical Engineering and Processing, 41:473-483.

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