Abstract

Experimentally, a difference was found between coagulation rates of quartz in aqueous solutions, under μg conditions and under 1 g: at μg conditions, coagulation is faster than at 1g. This difference is contrary to theoretical expectations; however, at 1 g in dispersions in which there is no density difference between the disperse and continuous phases, coagulation rate is also higher than in dispersions in which there is such a density difference. Theoretically, a difference in coagulation rates is not expected from low Reynolds number hydrodynamics. Apparently the non-linear terms in the Navier-Stokes equation become important even for small (1–3 μm) particles, when they are close enough for the London-van der Waals forces to be important.

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