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ISSN Print: 1091-028X
ISSN Online: 1934-0508
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1.7
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EXPERIMENTAL INVESTIGATIONS OF FLOW IN POROUS MEDIA FILLED WITH INHOMOGENEOUS MICROBEADS BASED ON MICROPARTICLE IMAGE VELOCIMETRY
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ABSTRACT
This study fabricated a porous media chip by filling glass microbeads with varying diameters from 80-250 μm in polymethylmethacrylate (PMMA) channels with 2 cm width, 0.5 mm depth, and 4 cm length. Flow fields were measured using microparticle image velocimetry (micro-PIV), and velocity statistics characteristic were analyzed. The experimental results indicate that flows in inhomogeneous microbead-filled porous media are highly random. Smaller velocity regions account for a larger proportion of the flow field, and peak velocity reduced and velocity uniformity increased as microbead diameter decreased. Non-dimensional velocity probability density functions (pdfs) in streamwise and span-wise had the same laws with typically former researches, and we found that pdfs were slightly dependent on microbead diameter.
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