Collision efficiency and colloidal stability of unequal size spherical particles moving through quiescent viscous liquid.

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Collision efficiencies have been computed for unequal-size spherical particles settling in quiescent viscous liquids, taking into account the hydrodynamic interaction, interparticle attraction and electrostatic repulsion. The results are closely related to the mechanism of coagulation of colloidal particles in a sedimentation field. If the interparticle attraction and electrostatic repulsion are both negligibly small as compared to viscous drag, the collision efficiency η is very small, i.e. about 0.003. However, a relatively large Van der Waals force makes η greater than unity. As the ratio of the radii of the two particles (smaller divided by larger) decreases the collision efficiency also decreases. The repulsive force between particles determines whether the collision efficiency is zero or larger than zero, but it does not affect the magnitude of the collision efficiency. By including the effect of electrostatic repulsion we were able to develop criteria which determine the stability (or flocculation) of colloidal particles.
公益社団法人化学工学会の論文