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TECHNICAL PAPERS

PIV Technique for the Simultaneous Measurement of Dilute Two-Phase Flows

[+] Author and Article Information
K. T. Kiger, C. Pan

Department of Mechanical Engineering, University of Maryland, College Park, MD 20742

J. Fluids Eng 122(4), 811-818 (Jul 26, 2000) (8 pages) doi:10.1115/1.1314864 History: Received May 23, 2000; Revised July 26, 2000
Copyright © 2000 by ASME
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References

Figures

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(a) Sample two-phase image. (b) Corresponding displacement vector field of carrier phase using standard PIV. Circles represent locations of dispersed phase particles.
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Sketch of the experimental setup
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(a) Dispersed phase (filtered) image. (b) Enlarged image and image intensity surface plot of the dispersed phase reference particle. (c) The corresponding vector displacement field for the dispersed phase.
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(a) Original two-phase image. (b) Carrier phase image obtained with the filter width f/dt=1.3. (c) Carrier phase image obtained with the filter width f/dt=2.1. (d) Carrier phase image obtained with the filter width f/dt=2.9.dp=13 pixels, dt=2.4 pixels.
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Artificial two-phase image creation: (a) single-phase tracer particle image, (b) single-phase dispersed phase particle image, (c) the artificial image reconstructed by adding (a) to (b) as given by Eq. (5)
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Errors induced by a median filter of width f/dt=2.1 for a single image pair. (a) Single phase image u⃗s, (b) Composite filtered image u⃗c, (c) u⃗s−u⃗c with location of dispersed phase particles shown by the open circles.
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Average absolute displacement error of carrier phase. (a) Spanwise direction. (b) Streamwise direction. +, filter width f/dt=1.3; *, filter width f/dt=2.4; ⋄, filter width f/dt=2.9.
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Average displacement error (serr=xerr2+yerr2) as a function of distance to the nearest neighboring dispersed phase particle. (a) No separation filter, (b) filter width f/dt=2.9, (c) filter width f/dt=2.4, and (d) filter width f/dt=1.3 pixels.
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Average displacement error (serr=xerr2+yerr2) as a function of carrier phase vorticity magnitude. (a) Filter width f/dt=1.3, (b) filter width f/dt=2.4, (c) filter width f/dt=2.9
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(a) The percentage of correctly identified particles (normalized by the actual number present in the image) versus the different size of particles. (b) Percentage of incorrectly identified particles (normalized by the actual number present in the image) versus the different size of particles. +, filter width f/dt=1.3; *, filter width f/dt=2.4; ⋄, filter width f/dt=2.9.
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Average absolute displacement error of dispersed phase. (a) Spanwise direction. (b) Streamwise direction. +, filter width f/dt=1.3; *, filter width f/dt=2.4; ⋄, filter width f/dt=2.9.
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Reynolds stress of (a) fluid and (b) particulates in near wake of cylinder. Units associated with the contours lines are in cm2 /s2 . Dashed lines represent negative stress values.
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Conditionally-averaged mean square slip velocity between the dispersed phase and the fluid. Units associated with the contour lines are in cm2 /s2 .
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Probability distribution function of vorticity, ωz, and strain rate, ∂v/∂x+∂u/∂y, for all fluid elements (–), and for particle-conditioned samples (--)

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