An experimental study of the hydrodynamic drag coefficient of a cooled hard sphere at small Reynolds numbers

The results of experimental studying the gravitational sedimentation of a cooled solid spherical particle in a viscous fluid in the range of Reynolds numbers $\operatorname{Re}$ = 0.01–1.32 are presented. A significant decrease of stationary sedimentation rate (up to 30%) of a cooled particle is shown. Empirical dependencies for the sedimentation rate and hydrodynamic drag coefficient of the particle in the range of temperature difference between liquid (glycerol, silicone oil) and particle $\Delta T$ = (0 – 210) K are obtained.