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how to find the apparent viscosity of non-Newtonian fluid in fluent?

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Old   December 18, 2019, 16:50
Default how to find the apparent viscosity of non-Newtonian fluid in fluent?
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I am trying to model bubble column reactor having a non-Newtonian liquid as primary phase and air. I have used shear dependent non-Newtonian power law model. I want to find the apparent viscosity of the liquid.

1) Would like to know whether the molecular viscosity that Fluent determines is the same as the apparent viscosity.
I checked the contour plot of the molecular viscosity for the liquid and the mixture in my simulation. But, I found that the upper and lower limit of the viscosity range for the liquid is always equal to the maximum viscosity that I entered while defining the fluid. Also, the viscosity range for the mixture, however, shows the range I defined initially. That is, mixture viscosity values are giving me results expected for the liquid. I am confused with this result.

2) Even the shear rate (strain rate in fluent) is not within the expected range (i.e, based on the non-Newtonian power law formula).

Kindly help.

thank you
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bubble column, non-newtonian, viscosity determination

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