Hydrodynamic screening in sedimenting suspensions of non-Brownian spheres

Journal Article · Thu Feb 01 04:00:00 EST 1996 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.76.1392· OSTI ID:284539

Ladd, A J ^[1]

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1. Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)

It has been suggested [D. L. Koch and E. S. G. Shaqfeh, J. Fluid Mech. {bold 224}, 275 (1991)] that the long-range hydrodynamic interactions in sedimenting suspensions of non-Brownian spheres are screened by changes in the pair correlation function. However, a large-scale numerical simulation, using more than 32000 spheres with full many-body hydrodynamic interactions, has found no evidence of the predicted changes in suspension microstructure. The absence of hydrodynamic screening in the simulations is shown to lead to divergent velocity fluctuations, in disagreement with recent experimental results [H. Nicolai and E. Guazzelli, Phys. Fluids {bold 7}, 3 (1995)]. {copyright} {ital 1996 The American Physical Society.}

• Research Organization: Lawrence Livermore National Laboratory
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 284539
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 8 Vol. 76; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

40 CHEMISTRY
66 PHYSICS
CORRELATION FUNCTIONS
FLUCTUATIONS
HYDRODYNAMICS
MICROSTRUCTURE
SCREENING
SIMULATION
SPHERES
SUSPENSIONS
VELOCITY