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CFX - Bingham Model with yield stess variable with temperature

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Old   April 21, 2017, 12:54
Question CFX - Bingham Model with yield stess variable with temperature
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Anna Carolina Gomes da Costa
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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
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Old   July 16, 2019, 16:26
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Sebastian
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Quote:
Originally Posted by annagoco View Post
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
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