An approximate formula of capacitance--void fraction relationship for annular flows

doi:10.1088/0957-0233/20/12/125404

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

Sin Kim et al 2009 Meas. Sci. Technol. 20 125404 (7pp) doi: 10.1088/0957-0233/20/12/125404

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Sin Kim¹, Jeong Seong Lee¹, Kyung Youn Kim², Kyung Ho Kang³ and Byung Jo Yun³
¹ Department of Nuclear and Energy Engineering, Jeju National University, Jeju 690-756, Korea
² Department of Electronic Engineering, Jeju National University, Jeju 690-756, Korea
³ Thermal Hydraulics Safety Research Division, Korea Atomic Energy Research Institute, Daejeon 305-353, Korea
E-mail: sinkim@jejunu.ac.kr

Abstract. 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.

Keywords: void fraction, concentric annular flow, capacitance, capacitance void meter

Print publication: Issue 12 (December 2009)
Received 21 July 2009, in final form 15 October 2009
Published 6 November 2009

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

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