Experimental measurement of shear-induced diffusion in suspensions using long time data

Sameer I. Madanshetty, Ali Nadim, Howard A. Stone

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

A method based upon Taylor dispersion theory is used to determine the shear-induced diffusion coefficient in concentrated suspensions. The experiments are performed in a cylindrical Couette device with a suspension consisting of polystyrene spheres in a density-matched solution of glycerin and water. A sequence of several hundred transit times for a single tagged sphere to complete successive orbits within the device is measured. The data are analyzed to compute the azimuthal Taylor dispersion coefficient from which the coefficient of shear-induced diffusivity is obtained. In our experiments the particle Reynolds numbers are script O sign (10-1). The experimental results are compared to the existing measurements of the shear-induced diffusion coefficient obtained at lower particle Reynolds numbers and based upon short-time data. We And a shear-enhanced diffusion coefficient D/γ + ̇a2 = script O sign(0.1) for a volume fraction of Φ≈0.25; this is comparable to existing results from previous low particle Reynolds number studies (ℛ<10-3).

Original languageEnglish (US)
Pages (from-to)2011-2018
Number of pages8
JournalPhysics of Fluids
Volume8
Issue number8
DOIs
StatePublished - Aug 1996

All Science Journal Classification (ASJC) codes

  • Computational Mechanics
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

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