Question on applied apparent viscosity in rheometer and shear thinning

[Aput]

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.

 

[Compositepro]

Pressure should have no effect that I can think of.

 

[jari001]

Theoretically, pressure should make viscosity go up slightly but even then it is almost a negligible affect unless 10[sup]3[/sup] psi is near or above the bulk modulus of the fluid.

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