I want to measure viscosity of soy slurry. Is it possible to evaluate viscosity of soy slurry with Brookfield LV 2 PRO? what is the best speed and spindle in brookfield viscometer in this test?
Dear Saman,
It depends on the concentration of your sample and type of soy. I would say for a 10% concentration of ISP, you can start from spin LV2 or 3 following by LV4. FOr the speed use the minimum speed, since you don't wanna break the network of sample.
Regards
Network of sample refers to concentration in hydrocolloids. In other word, proteins in solution system create a network that water can be entrap results in increase in viscosity. In soy system, particularly in ISP, you can see some rheological properties which is very important in industry. This is what called network of system. If you interested, please read some of our publication in protein systems.
I don't know about Soy slurry, but only Newtonian fluids have a viscosity that is independent of shear velocity. Thus if the system has a "network" or interactions between particulates I would suggest to measure viscosity vs velocity and then see which is the most appropriate viscosity value to use based on the velocities of your problem.
If your slurry is non-Newtonian and thixotropic, measure the viscosity as a function of rpm and also time of shear. Pick a spindle that allows you to operation in the 10-90% torque range and you should be fine. Be sure to thermostat your sample as the viscosity is likely temperature dependent as well. I'm assuming that your slurry is pourable.
Dear Sobhan,
This soy slurry is made from soy flour (without oil) and water. i main goal is increasing solid content in slurry. but the viscosity of slurry dramatically increase. this is my main problem. So, what is your offer for me? what chemical is good for my work?
Dear Carlos,
Thank you. i think this slurry is suspension and non Newtonian liquid. how can i compare Newtonian and Non Newtonian liquids? is it possible?
Dear Rhyta,
Thank you. yes this slurry is non-Newtonian and thixotropic. your answer is very helpful for me. How do i compare Newtonian and non-Newtonian liquid together?
In Newtonian the viscosity is independent of shear velocity and time.
If not depending it could be different things: Pseudoplastic, viscoelastic,dilatant , etc.
For more details see; http://en.wikipedia.org/wiki/Non-Newtonian_fluid
or any good text book or the web.
You can start your experiments looking at shear velocity at different soy concentrations. When you have a one that works then look at shearing time effects.
Dear Albert,
I think soy slurry is non Newtonian. so, how can i evaluate this slurry pourability? my final goal is spray the slurry on wood particles.
No, not yet, i read about that in papers. befor that, researchers reported thixotropic behavior of soy slurry. what is your comment for me?
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