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Non-Newtonian Carreau Model Fluid

Posted Nov 7, 2012, 5:58 a.m. EST 1 Reply

Gollakota Anjani Ravikiran
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Hello,

While solving the Equation of carreau model. I got a doubt. Her is the doubt

The equation is given for the carreau model fluid as

mu_inf = mu_inf +(mu_0-mu_inf) [1+lamda(gamma_dot)^2]^(n-1/2)

here the units of lamda is s.

and gamma_dot units are (1/s)

If this term vanishes the important property of shear rate is missing which is the basic definition of the non newtonian fluids where shear rate is the function of viscosity. where shear rate becomes dimensionless.

How to understand this aspect.............


Thanks in advance
1 Reply Last Post Nov 7, 2012, 2:28 p.m. EST
Nagi Elabbasi Facebook Reality Labs
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Posted: 1 decade ago Nov 7, 2012, 2:28 p.m. EST
Gollakota,

Viscosity is a function of shear rate and not the other way! When lambda=0 or n=1 (according to the equation used by COMSOL, which is slightly different from what you typed) the viscosity becomes constant and the fluid behavior is Newtonian.

Nagi Elabbasi
Veryst Engineering
Gollakota, Viscosity is a function of shear rate and not the other way! When lambda=0 or n=1 (according to the equation used by COMSOL, which is slightly different from what you typed) the viscosity becomes constant and the fluid behavior is Newtonian. Nagi Elabbasi Veryst Engineering

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