Abstract
Ostwald ripening of solid or liquid dispersoids in a liquid matrix is investigated. The dispersed particles move with respect to the matrix either due to gravity (Stokes sedimentation) or due to a temperature gradient (Marangoni motion). The problem of coarsening in a dispersion by Ostwald ripening is then treated including the effect of convective diffusion for arbitrary Peclet numbers. Time dependent solutions are obtained by a new numerical procedure and compared to asymptotic solutions. The most striking results of the present calculations are: The initial mean Peclet number of a dispersoid ensemble determines the evolution of the particle size distribution to a well defined stationary one. The initial mean Peclet number adjusts the relative amount of diffusional and convective transport of matter. The time dependent calculations show in addition that the solutions obtained by application of the classical asymptotic theory to this problem are seldom met in practice. Therefore experimental investigations of Ostwald ripening should use results of time dependent calculations for comparison.
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