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  • Journal of Fluid Mechanics, Volume 587
  • September 2007, pp. 163-172

Motion of a sphere normal to a wall in a second-order fluid

  • A. M. ARDEKANI (a1), R. H. RANGEL (a1) and D. D. JOSEPH (a1) (a2)
  • DOI: http://dx.doi.org/10.1017/S0022112007007549
  • Published online: 25 September 2007
Abstract

The motion of a sphere normal to a wall is investigated. The normal stress at the surface of the sphere is calculated and the viscoelastic effects on the normal stress for different separation distances are analysed. For small separation distances, when the particle is moving away from the wall, a tensile normal stress exists at the trailing edge if the fluid is Newtonian, while for a second-order fluid a larger tensile stress is observed. When the particle is moving towards the wall, the stress is compressive at the leading edge for a Newtonian fluid whereas a large tensile stress is observed for a second-orderfluid. The contribution of the second-order fluid to the overall force applied to the particle is towards the wall in both situations. Results are obtained using Stokes equationswhen α12=0. In addition, a perturbation method has been utilized for a sphere very close to a wall and the effect of non-zero α12 is discussed. Finally, viscoelastic potential flow is used and the results are compared with the other methods.

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