A Particle Image Velocimetry (PIV) image processing technique has been developed which can be applied to solid-liquid two-phase turbulent flows. The main principle of the technique is to utilize a two-dimensional median filter to generate separate images of the two phases, thus eliminating the errors induced by the distinct motion of the dispersed component. The accuracy and validity of the technique have been studied in the present research for different filter widths, f, and for 4 groups of different sized dispersed particles ranging from an effective image diameter of pixels to 13 pixels in combination with tracer particles with an effective image size of pixels. The results have shown that the errors introduced by the filter are negligible, and mainly arise in regions of large velocity gradients that are sensitive to the slight loss of information incurred by the processing. The filter width f also affects the algorithm’s ability to correctly separate and identify the dispersed phase particles from the two-phase images, with the main result that above a critical particle image size ratio, the particle size had no significant influence on the number of particles identified, or the accuracy of the displacement calculation. Sample results of particle-fluid interaction and cross-correlation terms which can be obtained from the method are also presented. [S0098-2202(00)01104-4]
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December 2000
Technical Papers
PIV Technique for the Simultaneous Measurement of Dilute Two-Phase Flows
K. T. Kiger,
e-mail: kkiger@eng.umd.edu
K. T. Kiger
Department of Mechanical Engineering, University of Maryland, College Park, MD 20742
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C. Pan
C. Pan
Department of Mechanical Engineering, University of Maryland, College Park, MD 20742
Search for other works by this author on:
K. T. Kiger
Department of Mechanical Engineering, University of Maryland, College Park, MD 20742
e-mail: kkiger@eng.umd.edu
C. Pan
Department of Mechanical Engineering, University of Maryland, College Park, MD 20742
Contributed by the Fluids Engineering Division for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received by the Fluids Engineering Division May 23, 2000; revised manuscript received July 26, 2000. Associate Technical Editor: J. Lasheras.
J. Fluids Eng. Dec 2000, 122(4): 811-818 (8 pages)
Published Online: July 26, 2000
Article history
Received:
May 23, 2000
Revised:
July 26, 2000
Citation
Kiger, K. T., and Pan, C. (July 26, 2000). "PIV Technique for the Simultaneous Measurement of Dilute Two-Phase Flows ." ASME. J. Fluids Eng. December 2000; 122(4): 811–818. https://doi.org/10.1115/1.1314864
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