Applications of computer simulations to dense suspension rheology

Barnes, Howard A.; Edwards, M.F.; Woodcock, Leslie V.

doi:10.1016/0009-2509(87)80021-0

Cited by 72 publications

(35 citation statements)

References 47 publications

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“…It seems that in these simulations at low shear rates the Brownian forces serve as the repulsive forces, and that, as the shear rate is increased, the hydrodynamic forces become more important, finally leading to clusters and an increased viscosity. Although shear thickening has also been observed in molecular dynamics simulations (Heyes, 1986;Barnes et al, 1987), none of these simulations have provided the quantitative agreement with experiments that SD simulations have done.…”

Section: Introductionsupporting

confidence: 59%

Computer simulations of shear thickening of concentrated dispersions

Boersma¹,

Lavèn²,

Stein³

1995

Journal of Rheology

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SynopsisStokesian dynamics computer simulations were performed on monolayers of equally sized spheres. The influence of repulsive and attractive forces on the rheological behavior and on the microstructure were studied. Under specific conditions shear thickening could be observed in the simulations, usually together with a change in the microstructure from ordered layers to a state with large clusters. These clusters are responsible for the high viscosities in shear thickening conditions. The shear thickening results show qualitative agreement with the theoretically expected behavior and with experiments. Van der Waals forces are found to sharpen the shear thickening transitions by inducing even stronger clusters and thus higher viscosities. 0 1995 Society of Rheology.

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Section: Introductionsupporting

confidence: 59%

Computer simulations of shear thickening of concentrated dispersions

Boersma¹,

Lavèn²,

Stein³

1995

Journal of Rheology

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“…Simulations can be performed dynamically as well as statically. A review on the application of computer simulations to the rheology of dense suspensions and their relation to experiments has been given by Barnes et al (1987). Most computer simulations which are of interest for concentrated dispersions of interacting particles are nonequilibrium molecular dynamics simulations (NEMD) on simple liquids.…”

Section: Introductionmentioning

confidence: 99%

Time‐dependent behavior and wall slip in concentrated shear thickening dispersions

Boersma

Baets

Lavèn

et al. 1991

Journal of Rheology

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SynopsisThe viscosity of concentrated shear thickening dispersions was measured as a function of shear rate, Couette cylinder size, and time. The level of the low shear rate viscosity, which was found to be independent of system size and time, could bc predicted by the equation of Frankel and Acrivos. At shear rates above the critical shear rate for shear thickening in highly concentrated (#> 0.57) dispersions of monodispcrse particles strong viscosity instabilities were detected, together with a dependence on cylinder size. The instabilities are attributed to reversible order-disorder transitions, e.g., from strings to clusters. This dependence on cylinder size is due to wall slip, slipping planes in the dispersion, and even plug flow in the gap. With less concentrated or polydisperse dispersions the effects are much less severe but there is thixotropy, probably due to a reordering of the dispersion.

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“…Until recently, dilatant fluid behaviour was considered to be much less widespread in the chemical and processing industries. However, with the recent growing interest in the handling and processing of systems with high solids loadings, it is no longer so, as is evidenced by the number of recent review articles on this subject (Barnes et al, 1987;Barnes, 1989;Goddard and Bashir, 1990). Typical examples of materials exhibiting dilatant behaviour include concentrated suspensions of china clay, titanium dioxide (Metzner and Whitlock, 1958) and of corn fl our in water (Griskey et al, 1985).…”

Section: Shear-thickening or Dilatant Fluid Behaviourmentioning

confidence: 99%