### Abstract

The effects of flow induced by a random acceleration field (g-jitter) are considered in two related situations that are of interest for microgravity fluid experiments: the random motion of isolated buoyant particles, and diffusion driven 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. The diffusive motion of a single solid particle suspended in an incompressible fluid that is subjected to such random accelerations is considered, and mean squared velocities and effective diffusion coefficients are explicitly given. We next study the flow induced by an ensemble of such panicles, and show the existence of a hydrodynamically induced attraction between pairs of particles at distances large compared with their radii, and repulsion at short distances. Finally, a mean field analysis is used to estimate the effect of g-jiner on diffusion controlled coarsening of a solid-liquid mixture. Corrections to classical coarsening rates due to the induced fluid motion are calculated and estimates are given for coarsening of Sn-rich particles in a Sn-Pb eutectic fluid, an experiment to be conducted in microgravity in the near future.

Original language | English (US) |
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Pages (from-to) | 1336-1343 |

Number of pages | 8 |

Journal | Physics of Fluids |

Volume | 9 |

Issue number | 5 |

DOIs | |

State | Published - May 1997 |

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### Cite this

*Physics of Fluids*,

*9*(5), 1336-1343. https://doi.org/10.1063/1.869259

**Coarsening of solid-liquid mixtures in a random acceleration field.** / Thomson, J. Ross; Casademunt, Jaume; Drolet, François; Viñals, Jorge.

Research output: Contribution to journal › Article

*Physics of Fluids*, vol. 9, no. 5, pp. 1336-1343. https://doi.org/10.1063/1.869259

}

TY - JOUR

T1 - Coarsening of solid-liquid mixtures in a random acceleration field

AU - Thomson, J. Ross

AU - Casademunt, Jaume

AU - Drolet, François

AU - Viñals, Jorge

PY - 1997/5

Y1 - 1997/5

N2 - The effects of flow induced by a random acceleration field (g-jitter) are considered in two related situations that are of interest for microgravity fluid experiments: the random motion of isolated buoyant particles, and diffusion driven 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. The diffusive motion of a single solid particle suspended in an incompressible fluid that is subjected to such random accelerations is considered, and mean squared velocities and effective diffusion coefficients are explicitly given. We next study the flow induced by an ensemble of such panicles, and show the existence of a hydrodynamically induced attraction between pairs of particles at distances large compared with their radii, and repulsion at short distances. Finally, a mean field analysis is used to estimate the effect of g-jiner on diffusion controlled coarsening of a solid-liquid mixture. Corrections to classical coarsening rates due to the induced fluid motion are calculated and estimates are given for coarsening of Sn-rich particles in a Sn-Pb eutectic fluid, an experiment to be conducted in microgravity in the near future.

AB - The effects of flow induced by a random acceleration field (g-jitter) are considered in two related situations that are of interest for microgravity fluid experiments: the random motion of isolated buoyant particles, and diffusion driven 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. The diffusive motion of a single solid particle suspended in an incompressible fluid that is subjected to such random accelerations is considered, and mean squared velocities and effective diffusion coefficients are explicitly given. We next study the flow induced by an ensemble of such panicles, and show the existence of a hydrodynamically induced attraction between pairs of particles at distances large compared with their radii, and repulsion at short distances. Finally, a mean field analysis is used to estimate the effect of g-jiner on diffusion controlled coarsening of a solid-liquid mixture. Corrections to classical coarsening rates due to the induced fluid motion are calculated and estimates are given for coarsening of Sn-rich particles in a Sn-Pb eutectic fluid, an experiment to be conducted in microgravity in the near future.

UR - http://www.scopus.com/inward/record.url?scp=0030774563&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0030774563&partnerID=8YFLogxK

U2 - 10.1063/1.869259

DO - 10.1063/1.869259

M3 - Article

AN - SCOPUS:0030774563

VL - 9

SP - 1336

EP - 1343

JO - Physics of Fluids

JF - Physics of Fluids

SN - 1070-6631

IS - 5

ER -