dorsal/arxiv
View SchemaMotion of buoyant particles and coarsening of solid-liquid mixtures in a random acceleration field
| Authors | J. Ross Thomson, Jaume Casademunt, Francois Drolet, Jorge Vinals |
|---|---|
| Categories | |
| ArXiv ID | patt-sol/9607003 |
| URL | https://arxiv.org/abs/patt-sol/9607003 |
| DOI | 10.1063/1.868627 |
| Journal | Phys. Fluids 7, 292 (1995). |
Abstract
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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"abstract": "Flow induced by a random acceleration field (g-jitter) is considered in two\nrelated situations that are of interest for microgravity fluid experiments: the\nrandom motion of an isolated buoyant particle and coarsening of a solid-liquid\nmixture. We start by analyzing in detail actual accelerometer data gathered\nduring a recent microgravity mission, and obtain the values of the parameters\ndefining a previously introduced stochastic model of this acceleration field.\nWe then study the motion of a solid particle suspended in an incompressible\nfluid that is subjected to such random accelerations. The displacement of the\nparticle is shown to have a diffusive component if the correlation time of the\nstochastic acceleration is finite or zero, and mean squared velocities and\neffective diffusion coefficients are obtained explicitly. Finally, the effect\nof g-jitter on coarsening of a solid-liquid mixture is considered. Corrections\ndue to the induced fluid motion are calculated, and estimates are given for\ncoarsening of Sn-rich particles in a Sn-Pb eutectic fluid, experiment to be\nconducted in microgravity in the near future.",
"arxiv_id": "patt-sol/9607003",
"authors": [
"J. Ross Thomson",
"Jaume Casademunt",
"Francois Drolet",
"Jorge Vinals"
],
"categories": [
"patt-sol",
"nlin.PS"
],
"doi": "10.1063/1.868627",
"journal_ref": "Phys. Fluids 7, 292 (1995).",
"title": "Motion of buoyant particles and coarsening of solid-liquid mixtures in a random acceleration field",
"url": "https://arxiv.org/abs/patt-sol/9607003"
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