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Sensors 2014, 14(5), 9093-9116; doi:10.3390/s140509093

A New Method for Ultrasound Detection of Interfacial Position in Gas-Liquid Two-Phase Flow

1,* , 2
1 Department of Electronic Engineering, Federal University of Technology—Paraná (UTFPR), Campus Toledo-PR, 85902-490, Brazil 2 Graduate School on Electrical Engineering and Applied Computer Science, Federal University of Technology—Paraná (UTFPR), Campus Curitiba-PR, 80230-901, Brazil
* Author to whom correspondence should be addressed.
Received: 3 December 2013 / Revised: 14 May 2014 / Accepted: 19 May 2014 / Published: 22 May 2014
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Ultrasonic measurement techniques for velocity estimation are currently widely used in fluid flow studies and applications. An accurate determination of interfacial position in gas-liquid two-phase flows is still an open problem. The quality of this information directly reflects on the accuracy of void fraction measurement, and it provides a means of discriminating velocity information of both phases. The algorithm known as Velocity Matched Spectrum (VM Spectrum) is a velocity estimator that stands out from other methods by returning a spectrum of velocities for each interrogated volume sample. Interface detection of free-rising bubbles in quiescent liquid presents some difficulties for interface detection due to abrupt changes in interface inclination. In this work a method based on velocity spectrum curve shape is used to generate a spatial-temporal mapping, which, after spatial filtering, yields an accurate contour of the air-water interface. It is shown that the proposed technique yields a RMS error between 1.71 and 3.39 and a probability of detection failure and false detection between 0.89% and 11.9% in determining the spatial-temporal gas-liquid interface position in the flow of free rising bubbles in stagnant liquid. This result is valid for both free path and with transducer emitting through a metallic plate or a Plexiglas pipe.
Keywords: ultrasound; Doppler method; multiphase flow; gas liquid two-phase flow ultrasound; Doppler method; multiphase flow; gas liquid two-phase flow
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Coutinho, F.R.; Ofuchi, C.Y.; de Arruda, L.V.R.; Jr., F.N.; Morales, R.E.M. A New Method for Ultrasound Detection of Interfacial Position in Gas-Liquid Two-Phase Flow. Sensors 2014, 14, 9093-9116.

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