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An experimental study of particle sedimentation using ultrasonic speckle velocimetry

Chinaud, Maxime and Delaunay, Thomas and Tordjeman, Philippe An experimental study of particle sedimentation using ultrasonic speckle velocimetry. (2010) Measurement Science and Technology, 21 (5). ISSN 0957-0233

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Official URL: http://dx.doi.org/10.1088/0957-0233/21/5/055402

Abstract

Ultrasonic speckle velocimetry (USV) is a non-invasive technique that allows the measurement of fluid velocity in flow and also that of powders under sedimentation. To improve the USV method, we studied the sedimentation of polymethyl methacrylate and silica particles in water. Then, we built a sedimentation cell and characterized the diameter distribution of the particles. Subsequently, we carried out a specific study to optimize the USV procedure, the signal processing and data analysis. Space and temporal resolution and USV dynamics are also discussed with regard to the optimization conditions. We found that USV is a useful technique to measure velocities between 10−5 and 1 m s−1, using appropriate ultrasonic transducers. The space resolution is fixed by the length and the percentage of overlapping of the analyzed speckle windows and varies between 48 and 536 μm for the different studied particle families. Furthermore, we found that a 0.1 ns temporal resolution could be obtained after a zero padding signal processing. In the context of our sedimentation experiments, we showed that the velocities measured by USV are in close agreement with those measured by particle image velocimetry and theory.

Item Type:Article
Additional Information:Thanks to Institute of Physics editor. The original PDF of the article can be found at Measurement Science and Technology website : http://iopscience.iop.org/0957-0233/
HAL Id:hal-00909563
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Other partners > Université de Montpellier 2 (FRANCE)
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Deposited On:26 Nov 2013 13:37

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