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# Viscosity measurement with a coriolis meter

## Viscosity measurement with a coriolis meter

(OP)
I am currently measuring the viscosity of a non-newtonian fluid (shear thinning) with a coriolis meter. The client measures the viscosity using a fann 35 viscometer at a shear rate of 300 reciprocal seconds. How can calculate the shear rate of my entire system so I can display viscosity at 300 reciprocal seconds?

### RE: Viscosity measurement with a coriolis meter

It should be the fluid velocity divided by the dimension of your flow meter orifice (diameter?) which will give you the shear rate. Then adjust the speed to obtain a shear rate of 300 s-1 to obtain similar results as the client.

Andrew H.
www.mototribology.com

### RE: Viscosity measurement with a coriolis meter

(OP)
Would I not need to take the shear rate of the rest of the system (piping, valves, elbows) into account? Also, the coriolis meter uses a torsional method to calculate the viscosity, would this not also affect the shear rate?

### RE: Viscosity measurement with a coriolis meter

If the fluid viscosity exhibits no time dependency (i.e non-thixotropic), no. With no time dependency, non-Newtonian behaviors are (assumed) instantaneous.

For a Newtonian fluid, shear rate at the wall of a pipe (circular conduit) = 8v/d. For a non-Newtonian fluid it depends on the rheology model, but it's usually close to 8v/d.

Good luck,
Latexman

To a ChE, the glass is always full - 1/2 air and 1/2 water.

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