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Sensors 2014, 14(12), 22431-22446; doi:10.3390/s141222431

Measurement of Gas-Liquid Two-Phase Flow in Micro-Pipes by a Capacitance Sensor

State Key Laboratory of Industrial Control Technology, Department of Control Science and Engineering, Zhejiang University, Hangzhou 310027, China
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Received: 17 October 2014 / Revised: 19 November 2014 / Accepted: 20 November 2014 / Published: 26 November 2014
(This article belongs to the Section Physical Sensors)
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Abstract

A capacitance measurement system is developed for the measurement of gas-liquid two-phase flow in glass micro-pipes with inner diameters of 3.96, 2.65 and 1.56 mm, respectively. As a typical flow regime in a micro-pipe two-phase flow system, slug flow is chosen for this investigation. A capacitance sensor is designed and a high-resolution and high-speed capacitance measurement circuit is used to measure the small capacitance signals based on the differential sampling method. The performance and feasibility of the capacitance method are investigated and discussed. The capacitance signal is analyzed, which can reflect the voidage variation of two-phase flow. The gas slug velocity is determined through a cross-correlation technique using two identical capacitance sensors. The simulation and experimental results show that the presented capacitance measurement system is successful. Research work also verifies that the capacitance sensor is an effective method for the measurement of gas liquid two-phase flow parameters in micro-pipes. View Full-Text
Keywords: capacitance sensors; two-phase flow; micro-pipe; slug flow; voidage; velocity; cross-correlation capacitance sensors; two-phase flow; micro-pipe; slug flow; voidage; velocity; cross-correlation
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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

Ji, H.; Li, H.; Huang, Z.; Wang, B.; Li, H. Measurement of Gas-Liquid Two-Phase Flow in Micro-Pipes by a Capacitance Sensor. Sensors 2014, 14, 22431-22446.

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