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Sensors 2017, 17(5), 1063; doi:10.3390/s17051063

A Dual Conductance Sensor for Simultaneous Measurement of Void Fraction and Structure Velocity of Downward Two-Phase Flow in a Slightly Inclined Pipe

1
Department of Nuclear and Energy Engineering, Jeju National University, Jeju 63243, Korea
2
Institute for Nuclear Science and Technology, Jeju National University, Jeju 63243, Korea
3
School of Energy Systems Engineering, Chung-Ang University, Seoul 06974, Korea
*
Author to whom correspondence should be addressed.
Academic Editor: Vittorio M. N. Passaro
Received: 6 March 2017 / Revised: 27 April 2017 / Accepted: 3 May 2017 / Published: 8 May 2017
(This article belongs to the Section Physical Sensors)
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Abstract

In this study, a new and improved electrical conductance sensor is proposed for application not only to a horizontal pipe, but also an inclined one. The conductance sensor was designed to have a dual layer, each consisting of a three-electrode set to obtain two instantaneous conductance signals in turns, so that the area-averaged void fraction and structure velocity could be measured simultaneously. The optimum configuration of the electrodes was determined through numerical analysis, and the calibration curves for stratified and annular flow were obtained through a series of static experiments. The fabricated conductance sensor was applied to a 45 mm inner diameter U-shaped downward inclined pipe with an inclination angle of 3° under adiabatic air-water flow conditions. In the tests, the superficial velocities ranged from 0.1 to 3.0 m/s for water and from 0.1 to 18 m/s for air. The obtained mean void fraction and the structure velocity from the conductance sensor were validated against the measurement by the wire-mesh sensor and the cross-correlation technique for the visualized images, respectively. The results of the flow regime classification and the corresponding time series of the void fraction at a variety of flow velocities were also discussed. View Full-Text
Keywords: dual conductance sensor; inclined pipe; void fraction; structure velocity; flow regime dual conductance sensor; inclined pipe; void fraction; structure velocity; flow regime
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Lee, Y.-G.; Won, W.-Y.; Lee, B.-A.; Kim, S. A Dual Conductance Sensor for Simultaneous Measurement of Void Fraction and Structure Velocity of Downward Two-Phase Flow in a Slightly Inclined Pipe. Sensors 2017, 17, 1063.

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