ORIGINAL CONTRIBUTION

Rheologica Acta

, Volume 39, Issue 4, pp 409-417

Oscillatory squeezing flow of a biological material

  • Nhan Phan-ThienAffiliated withMechanical and Production Engineering Department, National University of Singapore Singapore 118261
  • , Simin NasseriAffiliated withDepartment of Mechanical and Mechatronic Engineering University of Sydney NSW 2006 Australia
  • , Lynne E. BilstonAffiliated withDepartment of Mechanical and Mechatronic Engineering University of Sydney NSW 2006 Australia

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Abstract

Large-amplitude oscillatory squeezing flow data are reported for a complex biological material, which is highly shear-thinning in oscillatory shear flow. This soft tissue has a linear viscoelastic limit at a strain of approximately 0.2%. The oscillatory squeezing flow data at large strain are analyzed using two constitutive models: a bi-viscosity Newtonian model, and a non-linear Maxwell model. It is found that although both models may have the same response in shape, the later matches with our non-linear experimental data better. It is also concluded that the non-linear response of the material in large amplitude oscillatory flow is mainly due to the shear thinning of the material.

Key words Squeezing flow Rheology constitutive model Kidney