Dynamic viscosity @ kinematic!
Dynamic viscosity @ kinematic!
(OP)
hi all,
I am working on rotational viscometer to measure dynamic viscosity and I have to use just one value to calculate the kinematic viscosity, but in this case I've already got many values of dynamic viscosity at shear rate range from 0 -1000 s-1.
my question now is can I use the only first value of dynamic. because i need only one value?
if you have any idea please help me.
thank a lot





RE: Dynamic viscosity @ kinematic!
RE: Dynamic viscosity @ kinematic!
RE: Dynamic viscosity @ kinematic!
RE: Dynamic viscosity @ kinematic!
This means that all the data is valid and all could be converted.
It helps to report what type of fluid you have:
is it dialatant? (shear thickening)
pseudoplastic? (shear thinning)
Bingham palstic or whatever.
Does it show time or work dependency?
Is the behaviour reversable?
Now the key question is:
Why are you measuring the viscosity?
If you know the context for the measurement then, perhaps, you can narrow it down as to if there is a value that is appropriate.
For example, if it is pseudoplastic i.e. has a high viscosity at low shear rates then if you are trying to predict the behaviour when pumped you may need to extend your shear rate to higher values for a gear pump or to low values for a piston pump or other low shear pump if theproduct is permanently deformed (damaged) by high shear.
JMW
www.ViscoAnalyser.com
RE: Dynamic viscosity @ kinematic!
RE: Dynamic viscosity @ kinematic!
Suggest reading an article titled Program helps friction factor for non-Newtonian fluid flow by H.A. Ohen, that appeared in the OGJ issue of Jan 2, 1989.