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

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

1,* , 2
,
2
,
2
 and
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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Abstract

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 3.0).
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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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