Abstract
A method is described for measuring disturbance velocity fields induced by N spherical particles rising in a quiescent fluid at low Reynolds number. The method requires information for the particle configuration and the instantaneous flow field at the same time. The particle location was measured with stereoscopic cameras, and induced velocity fields were obtained by using a particle image velocimetry. Disturbance velocity fields were evaluated at a plane, which was defined as the difference between the real velocity fields and the superposition of Stokes solutions for each rising sphere at known location. Large disturbance velocities were observed near the particles, and their directions were opposite to the rising motion of the spheres.
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