Abstract
Particles can be rejected by the growing solid as a result of fluid flow. It has been observed that without fluid flow, particles are engulfed by the growing solid at very low growth rates. When the flow rate is higher than a critical value, a particle can be put into motion and thus prevented from being engulfed. The critical local flow rate required to put a particle into motion has been measured and modelled. This critical flow rate depends on the size and density of the particle, the roughness of the interface and the growth rate of the solid. For small particles, a very small sideways motion of the liquid is enough to put a particle into motion.
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