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We report a novel experimental technique that measures simultaneously inthree dimensions the trajectories, the translation, and the rotation of finitesize inertial particles together with the turbulent flow. The flow field isanalyzed by tracking the temporal evolution of small fluorescent tracerparticles. The inertial particles consist of a super-absorbent polymer thatrenders them index and density matched with water and thus invisible. Theparticles are marked by inserting at various locations tracer particles intothe polymer. Translation and rotation, as well as the flow field around theparticle are recovered dynamically from the analysis of the marker and tracerparticle trajectories. We apply this technique to study the dynamics ofinertial particles much larger in size (Rp/{\eta} \approx 100) than theKolmogorov length scale {\eta} in a von K\'arm\'an swirling water flow(R{\lambda} \approx 400). We show, using the mixed (particle/fluid) Euleriansecond order velocity structure function, that the interaction zone between theparticle and the flow develops in a spherical shell of width 2Rp around theparticle of radius Rp. This we interpret as an indication of a wake induced bythe particle. This measurement technique has many additional advantages thatwill make it useful to address other problems such as particle collisions,dynamics of non-spherical solid objects, or even of wet granular matter.

Simultaneous 3D measurement of the translation and rotation of finite size particles and the flow field in a fully developed turbulent water flow