# CFX - Bingham Model with yield stess variable with temperature

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 April 21, 2017, 12:54 CFX - Bingham Model with yield stess variable with temperature #1 New Member   Anna Carolina Gomes da Costa Join Date: Apr 2017 Posts: 2 Rep Power: 0 Hello, I am trying to simulate a parafin deposition model using CFX. In order to facilitate my job I am trying to apply a bingham behaviour for the viscosity of my fluid with yield stress as a function of temperature. I dont think i can use an expression for the yield stress so now I am thinking about creating an expression for my viscosity. So I have 2 questions: 1) I would like to calculate the sheer stress in my fluid. There is not a variable for that in cfx. There is one for sheer strain rate but the relationship between the two is quite complicated for my flow. its a flow in a annular section with different temperatures in the inner and outter walls. Has here tried something similar? (2) what kind of numerical issues might appear because of this model? Anyways, I am having a hard time figuiring out a solution for this. I am a grad student, havent used CFX for a long time, pretty new to it. Thank in advance, ANNA

July 16, 2019, 16:26
#2
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Sebastian
Join Date: Jul 2019
Posts: 3
Rep Power: 6
Quote:
 Originally Posted by annagoco Hello, I am trying to simulate a parafin deposition model using CFX. In order to facilitate my job I am trying to apply a bingham behaviour for the viscosity of my fluid with yield stress as a function of temperature. I dont think i can use an expression for the yield stress so now I am thinking about creating an expression for my viscosity. So I have 2 questions: 1) I would like to calculate the sheer stress in my fluid. There is not a variable for that in cfx. There is one for sheer strain rate but the relationship between the two is quite complicated for my flow. its a flow in a annular section with different temperatures in the inner and outter walls. Has here tried something similar? (2) what kind of numerical issues might appear because of this model? Anyways, I am having a hard time figuiring out a solution for this. I am a grad student, havent used CFX for a long time, pretty new to it. Thank in advance, ANNA

hi could you solve your problem i am working in a plastic bingham and i do not know much

 Tags bingham, cfx, shear stress, shear stress equations, viscosity