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An approximate formula for the capacitance–void fraction relationship for annular flows

Sin Kim1, Jeong Seong Lee1, Kyung Youn Kim2, Kyung Ho Kang3 and Byung Jo Yun3

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A capacitance method is applied to measure the space-averaged void fraction in concentric annular flows. From the analytical solution of the governing electrical field equations, the expression for the capacitance in terms of a given void fraction is derived. Also, a closed form formula to predict the void fraction from the capacitance measurement is proposed. The relationship between the capacitance and the void fraction is successfully compared with static phantom experiments.


PACS

47.55.Ca Gas/liquid flows

77.22.Ch Permittivity (dielectric function)

47.61.Jd Multiphase flows

Subjects

Fluid dynamics

Condensed matter: electrical, magnetic and optical

Dates

Issue 12 (December 2009)

Received 21 July 2009, in final form 15 October 2009

Published 6 November 2009



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