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In this fluid dynamics video we investigate the flow field around straight-line swimming and right and left turning Paramecia using micro- particle image velocimetry ({mu}PIV). A Paramecium controls its ciliary beating to produce different fluid velocities on either side of its body. This phenomenon is visualized by applying {mu}PIV to images in which Paramecia swim in a dilute suspension of 1 {mu}m polystyrene spheres. Paramecia that swim straight exhibit similar magnitudes of velocity on either side of their bodies. In contrast, right-turning Paramecia exhibit greater magnitudes of velocity on their right sides, while left-turning organisms show the opposite.
Flux of rigid or soft particles (such as drops, vesicles, red blood cells, etc.) in a channel is a complex function of particle concentration, which depends on the details of induced dissipation and suspension structure due to hydrodynamic interactio
Transforming a laser beam into a mass flow has been a challenge both scientifically and technologically. Here we report the discovery of a new optofluidics principle and demonstrate the generation of a steady-state water flow by a pulsed laser beam t
Velocity gradient is the basis of many vortex recognition methods, such as Q criterion, $Delta$ criterion, $lambda_{2}$ criterion, $lambda_{ci}$ criterion and $Omega$ criterion, etc.. Except the $lambda_{ci}$ criterion, all these criterions recognize
The elastoviscoplastic yield-stress fluid flows in a horizontal straight tube and a bended tube have been investigated using hydrogen bubble visualization method. The experimental results are used to verify the empirical Herschel-Bulkley model. Both
The incompressible three-dimensional Euler equations develop very thin pancake-like regions of increasing vorticity. These regions evolve with the scaling $omega_{max}simell^{-2/3}$ between the vorticity maximum and the pancake thickness, as was obse