Coarsening of solid-liquid mixtures in a random acceleration field

J. Ross Thomson, Jaume Casademunt, François Drolet, Jorge Viñals

Research output: Contribution to journalArticlepeer-review

19 Scopus citations


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 languageEnglish (US)
Pages (from-to)1336-1343
Number of pages8
JournalPhysics of Fluids
Issue number5
StatePublished - May 1997


Dive into the research topics of 'Coarsening of solid-liquid mixtures in a random acceleration field'. Together they form a unique fingerprint.

Cite this