Stress Distributions in Flowing Aggregated Colloidal Suspensions

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Simulations of the flow of concentrated aggregated colloidal systems, at the particulate level, are used to investigate the distribution of stresses in the shear-thiming regime. It is found that the distribution of shear stress carried by interparticle bonds decays approximately exponentially at large stresses, but with a double-exponential distribution for values of positive stress. The microstructural mechanisms associated with large stresses are manifested in clusters which dominate the positive contribution to the stress in the system. Towards the end of shear thinning the highest forces occur along bonds defining rods of particles aligned approximately along the flow-compression direction. We propose ... continued below

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10 p.

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Silbert, L.E.; Farr, R.S.; Melrose, J.R. & Ball, R.C. August 26, 1999.

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  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Albuquerque, NM, and Livermore, CA (United States)
    Place of Publication: Albuquerque, New Mexico

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Description

Simulations of the flow of concentrated aggregated colloidal systems, at the particulate level, are used to investigate the distribution of stresses in the shear-thiming regime. It is found that the distribution of shear stress carried by interparticle bonds decays approximately exponentially at large stresses, but with a double-exponential distribution for values of positive stress. The microstructural mechanisms associated with large stresses are manifested in clusters which dominate the positive contribution to the stress in the system. Towards the end of shear thinning the highest forces occur along bonds defining rods of particles aligned approximately along the flow-compression direction. We propose that the rheology of such systems is determined by a rupture-reformation process of these clusters of stress concentration during the flow. The aggregation forces play the role of enhancing such stress concentration by stabilizing clusters against buckling.

Physical Description

10 p.

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OSTI as DE00010359

Medium: P; Size: 10 pages

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  • Journal Name: Journal of Chemical Physics; Other Information: Submitted to Journal of Chemical Physics

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  • Report No.: SAND99-2200J
  • Grant Number: AC04-94AL85000
  • DOI: 10.1063/1.479241 | External Link
  • Office of Scientific & Technical Information Report Number: 10359
  • Archival Resource Key: ark:/67531/metadc623448

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  • August 26, 1999

Added to The UNT Digital Library

  • June 16, 2015, 7:43 a.m.

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  • April 6, 2017, 7:06 p.m.

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Silbert, L.E.; Farr, R.S.; Melrose, J.R. & Ball, R.C. Stress Distributions in Flowing Aggregated Colloidal Suspensions, article, August 26, 1999; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc623448/: accessed October 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.