Here we report experiments on particle cluster settling at high Reynolds number in quiescent liquid contained in a vessel.The particles were observed to spread at the vessel bottom surface in a near-circular annular s...Here we report experiments on particle cluster settling at high Reynolds number in quiescent liquid contained in a vessel.The particles were observed to spread at the vessel bottom surface in a near-circular annular shape after settling irrespective of the shape of the vessel cross-section and particle shape,size,and types.Effect of different parameters such as mass,type and aspect ratio of the particles,height,and viscosity of liquid was investigated on spreading behaviour.Formation of the hemispherical bottom cap of the cluster that bounces upon hitting the vessel bottom surface was found to be responsible for the final circular annular shape of the settled structure.Particle leakage from the cluster was seen in the form of a tail.In the liquid having viscosity beyond 100 cP,cluster breakage was observed that resulted in hindered settling and asymmetric shapes of finally settled particles.The observations are useful to understand the overall area over which settling and spreading of such clusters can be observed.展开更多
基金The authors thank the Dept.of Science&Tech.(Gol)for the funding through Swarnajayanti Fellowship DST/SJF/ETA-03/2014-15Dr.Sayan Pal acknowledges the Council of Scientific and Industrial Research(CSIR)for doctoral fellowship。
文摘Here we report experiments on particle cluster settling at high Reynolds number in quiescent liquid contained in a vessel.The particles were observed to spread at the vessel bottom surface in a near-circular annular shape after settling irrespective of the shape of the vessel cross-section and particle shape,size,and types.Effect of different parameters such as mass,type and aspect ratio of the particles,height,and viscosity of liquid was investigated on spreading behaviour.Formation of the hemispherical bottom cap of the cluster that bounces upon hitting the vessel bottom surface was found to be responsible for the final circular annular shape of the settled structure.Particle leakage from the cluster was seen in the form of a tail.In the liquid having viscosity beyond 100 cP,cluster breakage was observed that resulted in hindered settling and asymmetric shapes of finally settled particles.The observations are useful to understand the overall area over which settling and spreading of such clusters can be observed.
