CFD Online Discussion Forums

CFD Online Discussion Forums (https://www.cfd-online.com/Forums/)
-   FLUENT (https://www.cfd-online.com/Forums/fluent/)
-   -   Non-Newtonian power law: unable to define minimum and maximum viscosity (https://www.cfd-online.com/Forums/fluent/158863-non-newtonian-power-law-unable-define-minimum-maximum-viscosity.html)

Simona September 5, 2015 13:27

Non-Newtonian power law: unable to define minimum and maximum viscosity
 
Hello guys!!!
I m a beginner in fluent and i really need your help for one project that i have!
My project is about:
Pipe with non Newtonian fluid inside i do not have the lenght of my geometry but my fluid is fully developed (that means that the pipe shoulb pretty long to have this condition right?)
Well i draw my geometry and than i start to use fluent whe i define material and i put "water-liquid" than i select "viscosity-> Non newtonian power law" and then i should have minimun and maximum viscosity, but i don't:(, and i really don't know:confused: which kind of values i have to put and in which way i ca ceck if they will be correct or not.Can you help me please? Thanks.:):):)

mafiq2000 September 21, 2015 01:13

Hey simona , i'm also have problem same with you , untill now you have any solution to find maximum , minimum viscosity and consitency index for fluent ?

Bruno Machado September 21, 2015 06:47

Quote:

Originally Posted by mafiq2000 (Post 564909)
Hey simona , i'm also have problem same with you , untill now you have any solution to find maximum , minimum viscosity and consitency index for fluent ?

For minimum and maximum you can conside the Pr of water divided and multiplied by 1E4 respectively. After that you can check if your Molecular Viscosity is located within this range.

Bruno Machado September 21, 2015 06:49

Quote:

Originally Posted by Simona (Post 562562)
Hello guys!!!
I m a beginner in fluent and i really need your help for one project that i have!
My project is about:
Pipe with non Newtonian fluid inside i do not have the lenght of my geometry but my fluid is fully developed (that means that the pipe shoulb pretty long to have this condition right?)
Well i draw my geometry and than i start to use fluent whe i define material and i put "water-liquid" than i select "viscosity-> Non newtonian power law" and then i should have minimun and maximum viscosity, but i don't:(, and i really don't know:confused: which kind of values i have to put and in which way i ca ceck if they will be correct or not.Can you help me please? Thanks.:):):)

you can write an UDF profile to set a fully developed flow regardless of the length of the pipe.


All times are GMT -4. The time now is 18:04.