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Visualization of water flow around structures or in porous media requires refractivity matching of water and the transparent solid materials. The authors have developed two methods to make transparent spheres from silicon rubber; the stirring method and the casting method. Visualization experiments of water flow around a sphere coming up to the surface and in a porous medium were performed to examine the validity of the refractivity matching method. Velocity vectors of these flows were obtained from recorded particle images by a PTV algorithm, while was also developed by the authors.

PTV Measurement in Porous Medium by Using the Refractivity Matching Method