Dear Omar, a spindle Brookfield is not the best choice to measure non-newtonian fluids. The ideal would be a rheometer and use cone-plates, plate-plate, or coaxial cylinders. However, I can imagine you have no other option than your Brookfield. In this case, look for the book of Dr. Barnes: "A HANDBOOK OF ELEMENTARY RHEOLOGY", 2000. In chapter 10, pages 34 and 68-69.

https://www.aber.ac.uk/en/phys/research/materials/rheology/

In addition to the previous right answer, Prof. Omar Abro, please look at the following scientific instrument.

Its characteristics seem to be wide, i.e., for very different non Newtonian fluids from viscoelastic to heavy oil:

https://www.aandd.jp/products/test_measuring/sv10/sv.html

Best Regards.

The flow curve of any fluid can easily be obtained using a rheometer. A rheometer can also perform amplitude sweep, frequency sweep, etc. And these measurements can be used to get additional information about the fluid. In short, A rheometer is a viscometer, but a viscometer is not a rheometer.

The advantage of a rheometer over a traditional viscometer is that it can accurately measure the flow in a vast viscosity.

Please find basic details on measurements from the rheometer in the following link -

https://wiki.anton-paar.com/in-en/basics-of-rheology/

I would not suggest using spindle based Brookfield viscometer for non-Newtonian fluid. Depending upon the nature of viscoelastic material, you should use rheometer with appropriate geometry.

Hello, Omar Abro, I 'm honored to be asked to answer this question, and I recently did a series of rheological experiments on non-Newtonian fluids using a rheometer. I think you can also use rheometers to measure the shear rate and viscosity of non-Newtonian fluids. There are many brands of rheometers on the market, such as Anton Paar and Brookfield, which can meet your measurement requirements. I hope my answer will help you.