For a Newtonian fluid n =1, for a dilatant fluid
n >1 and pseudoplastic fluid n <1).
For a fluid with n > 1, the effective viscosity increases with shear rate, and the fluid is called shear-thickening or dilatant fluid
. For a fluid with 0 < n < 1, the effective viscosity decreases with shear rate, and the fluid is called shear-thinning or pseudoplastic fluid.
For [[mu].sub.0] = 0, if p < 2 then it is a pseudo-plastic fluid, and if p > 2 then it is a dilatant fluid
For [[mu].sub.0] = 0 if r < 0 then a fluid is called a pseudo-plastic fluid, if r > 0 it is a dilatant fluid
Figs.2 illustrate the effect of the magnetic parameter Mon the velocity and the temperature profiles for the pseudo-plastic fluid (n = 0.8 < 1) and the dilatant fluid
(n = 1.2 > 1), respectively.
Repolyols obtained in split-phase process in applied conditions (shear rate 0-100 [s.sup.-1], temperatures 25-60[degrees]C) have the flow index higher than 1, so they are dilatant fluids
and their behavior is shear thickening.
Figures 3 and 6 show the effect of [S.sub.t] and [B.sub.r] numbers on velocity and temperature for dilatant fluids
. Graphs for pseudoplastic fluids are given in Figures 4 and 7.
Media with p > 2 are called dilatant fluids
and those with p < 2 are called pseudoplastics.
Chhabra, "Drag on Spheroidal Particles in Dilatant Fluids
," AIChE J.