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Question on applied apparent viscosity in rheometer and shear thinning

Question on applied apparent viscosity in rheometer and shear thinning

Question on applied apparent viscosity in rheometer and shear thinning

(OP)
Hello,

I have a fluid that has proven to be shear thinning using a spindle rheometer at ambient pressure, showing an apparent viscosity decrease by a factor of about 3x when running a shear sweep from 5 to 100 1/s at constant temperature.

If I were able to put said fluid in a spindle rheometer under 10,000 psi of mechanical pressure (not using a gas pressure source), could I still expect similar decrease in apparent viscosity with shear, and could I be absolutely certain that the fluid would still be shear thinning?

Translate the above question to viscosity measurement in a tube-style viscometer; could I expect the same apparent viscosity curve that I saw in the spindle-type rheometer? The flow would be comfortably laminar.

RE: Question on applied apparent viscosity in rheometer and shear thinning

Pressure should have no effect that I can think of.

RE: Question on applied apparent viscosity in rheometer and shear thinning

Theoretically, pressure should make viscosity go up slightly but even then it is almost a negligible affect unless 103 psi is near or above the bulk modulus of the fluid.

http://www.viscopedia.com/basics/factors-affecting...

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