Motion of buoyant particles and coarsening of solid-liquid mixtures in a random acceleration field

Details Motion of buoyant particles and coarsening of solid-liquid mixtures in a random acceleration field Motion of buoyant particles and coarsening of solid-liquid mixtures in a random acceleration field

1996-07-18

arxiv.org/abs/patt-sol/9607003v1

Phys. Fluids 7, 292 (1995).

Nonlinear Sciences

Pattern Formation and Solitons

25 pages, 4 figures (included). Also at http://www.scri.fsu.edu/~vinals/ross2.ps

Scientific paper

10.1063/1.868627

Flow induced by a random acceleration field (g-jitter) is considered in two related situations that are of interest for microgravity fluid experiments: the random motion of an isolated buoyant particle and coarsening of a solid-liquid mixture. We start by analyzing in detail actual accelerometer data gathered during a recent microgravity mission, and obtain the values of the parameters defining a previously introduced stochastic model of this acceleration field. We then study the motion of a solid particle suspended in an incompressible fluid that is subjected to such random accelerations. The displacement of the particle is shown to have a diffusive component if the correlation time of the stochastic acceleration is finite or zero, and mean squared velocities and effective diffusion coefficients are obtained explicitly. Finally, the effect of g-jitter on coarsening of a solid-liquid mixture is considered. Corrections due to the induced fluid motion are calculated, and estimates are given for coarsening of Sn-rich particles in a Sn-Pb eutectic fluid, experiment to be conducted in microgravity in the near future.

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