Simultaneous PIV and pulsed shadow technique in slug flow: a solution for optical problems

A recent technique of simultaneous particle image velocimetry (PIV) and pulsed shadow technique (PST) measurements, using only one black and white CCD camera, is successfully applied to the study of slug flow. The experimental facility and the operating principle are described. The technique is appl...

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Bibliographic Details
Published in:Experiments in fluids 2003-12, Vol.35 (6), p.598-609
Main Authors: NOGUEIRA, S, SOUSA, R. G, PINTO, A. M. F. R, RIETHMULLER, M. L, CAMPOS, J. B. L. M
Format: Article
Language:English
Subjects:
Bubbles
Exact sciences and technology
Fluid dynamics
Fundamental areas of phenomenology (including applications)
Instrumentation for fluid dynamics
Multiphase and particle-laden flows
Nonhomogeneous flows
Nose
Particle image velocimetry
Physics
Shadows
Slug flow
Spatial resolution
Taylor bubbles
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Description
Summary:A recent technique of simultaneous particle image velocimetry (PIV) and pulsed shadow technique (PST) measurements, using only one black and white CCD camera, is successfully applied to the study of slug flow. The experimental facility and the operating principle are described. The technique is applied to study the liquid flow pattern around individual Taylor bubbles rising in an aqueous solution of glycerol with a dynamic viscosity of 113A10?3 Pa s. With this technique the optical perturbations found in PIV measurements at the bubble interface are completely solved in the nose and in annular liquid film regions as well as in the rear of the bubble for cases in which the bottom is flat. However, for Taylor bubbles with concave oblate bottoms, some optical distortions appear and are discussed. The measurements achieved a spatial resolution of 0.0022 tube diameters. The results reported show high precision and are in agreement with theoretical and experimental published data.
ISSN:0723-4864
1432-1114
DOI:10.1007/s00348-003-0708-8