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Flow across a semi-permeable membrane
Posted 22 mai 2015, 02:31 UTC−4 Fluid & Heat, Geometry Version 4.3b 2 Replies
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Hi ,
I am trying to model flow through a semi-permeable membrane due to a pressure gradient. For now, I am using free and porous media flow physics and for my geometry, I have set up 3 rectangles next to each other. The middle rectangle has been designated to be the porous material, and the rectangles on the ends are the fluid materials.
Am I approaching this problem correctly with COMSOL? If not, what is the best way to approach this? How am I suppose to specify 2 separate pressures on both sides of the membrane to drive fluid flow across the membrane?
Thank you so much,
Aaron
I am trying to model flow through a semi-permeable membrane due to a pressure gradient. For now, I am using free and porous media flow physics and for my geometry, I have set up 3 rectangles next to each other. The middle rectangle has been designated to be the porous material, and the rectangles on the ends are the fluid materials.
Am I approaching this problem correctly with COMSOL? If not, what is the best way to approach this? How am I suppose to specify 2 separate pressures on both sides of the membrane to drive fluid flow across the membrane?
Thank you so much,
Aaron
2 Replies Last Post 23 mai 2015, 06:59 UTC−4
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Posted:
10 years ago
Update:
I tried applying laminar flow and transport of dilute species physics. For the geometry, I created an assembly with 2 squares next to each other and set the contact point in the middle as a flow continuity. This boundary is my membrane. I tried setting an equation for the flux at that boundary using the pressure difference (J= hydraulic conductivity * Pressure difference).
I still have no success however.
I tried applying laminar flow and transport of dilute species physics. For the geometry, I created an assembly with 2 squares next to each other and set the contact point in the middle as a flow continuity. This boundary is my membrane. I tried setting an equation for the flux at that boundary using the pressure difference (J= hydraulic conductivity * Pressure difference).
I still have no success however.
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Posted:
10 years ago
Let's say that the velocity variables of the liquid flow is u, v and w in the flanking domain. Then in the porous domain use leaking wall boundary condition, setting these variables the boundary values.
Attached my model which I did some time ago. There a flow is hitting a porous plug.
br Lasse
Attached my model which I did some time ago. There a flow is hitting a porous plug.
br Lasse
Attachments: