Abstract
Experiments on two equal spheres falling freely in quiescent glycerol are carried out in order to discuss the effectiveness of Oseen's reflection method. The width of the test tank with a square cross section is 100 times the sphere diameter. The experiments show that the free-fall motion of two equal spheres at low Reynolds numbers is classified into four types according to the angle between the center line of two spheres and the vertical line. These motions are not predicted using Stokes' theory. However the numerical results obtained using Oseen's reflection method show good agreement with the experimental results.
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