Curve – Shear Stress v/s Velocity Gradient

  1. Elastic Solid Fluid
  2. Thixotropic Fluid (n<1, B=/=0)
  3. Ideal Plastic Fluid (n=1, B=/=0)
  4. Rheopectic/ Rheological Fluid (n>1, B=/=0)
  5. Pseudo Plastic Fluid (n>1, B=0)
  6. Newtonian Fluid (n=1, B=0)
  7. Dilatant Fluid (n<1, B=0)
  8. Ideal Fluid

When B=0,

  • n=1 Newtonian fluid, Viscosity invariant of shear stress (air, water, gasoline)
  • n>1 Shear thickening Fluid/ Pseudo Plastic Fluid, Viscosity increases with increase in deformation (paint, blood, paper pulp, mud slurry)
  • n<1 Shear Thinning/ Dilatant Fluid, Viscosity decreases with increase in shear stress (butter, starch, concentrated sugar solution, suspended sand solution)

When B=/=0,

  • n=1 Ideal Bingham Fluid/ Ideal Plastic Fluid (tooth paste, drilling mud)
  • n>1 Rheological Fluid, Viscosity increases with increase in shear stress
  • n<1 Thixotropic Fluid, Viscosity decreases with increase in shear stress (printer’s ink)