Herschel-Bulkley model

- February 9, 2023 at 10:36 am
  
  Govind Mishra
  Subscriber
  
  In Ansys fluent, the goerning equation for the Herschel-Bulkley model is quite different as compared to what we learnt in the fluid mechanics ? What can i interpret from the equation used in the Ansys Fluent ?
  What is critical shear rate used in that equation ?
- February 9, 2023 at 11:56 am
  
  Rob
  Ansys Employee
  
  It's something you set, and https://ansyshelp.ansys.com/account/Secured?returnurl=/Views/Secured/corp/v231/en/flu_ug/flu_ug_sec_viscosity.html%23flu_ug_sec_viscosity_non_newtonian gives some of the information you're after.
- February 10, 2023 at 5:28 pm
  
  Govind Mishra
  Subscriber
  
  In the Ansys user manual,
  the equation for the Herschel-Bulkley model is given as :-
  
  But the standard equation of the Herschel-Bulkley model is given by :-
  how can i correlate these two equations ?
- February 10, 2023 at 5:46 pm
  
  Rob
  Ansys Employee
  
  By plotting data? The model used in Fluent is the model defined in the manual, if you'd rather calculate from scratch there are Expressions and UDFs to do this.

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