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July 30, 2019, 10:32 |
Droplet displacement gone wrong
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#1 |
New Member
Vitor Heitor Cardoso
Join Date: Jan 2019
Location: Rio de Janeiro
Posts: 10
Rep Power: 7 |
Dear community,
I'm using interFoam for a case concerning an oil droplet displacement through a micro-constricted capillar (constriction diameter ~225e-6 m). The case is developed as follows: - Axissymmetric geometry; - Velocity Driven Flow; - Inlet Velocity (4e-4 0 0); - Gravitational Effects Neglectable; - Continuous Phase = Water (rho 1000kg/m³); Dispersed Phase = Oil (rho = 1328.8 kg/m³); - Contact Angle is yet to define; As a first analysis, I set up interfacial tension real low (72e-8 N/m), so I could see how the droplet would deform. After, I tried to increase sigma to its experimental value (sigma = 0,072 N/m), however, In this case the droplet doesnt deforms as I thought it would do. Instead, it suddenly jumps towards the wall and sticks right in the middle of the constriction. I'm still running the experiments, and havent had experimental contact angle yet, but I didnt expect this behavior. Picture 1 (Start) is the initial phase fraction state, picture 2 (NoSigma) concerns to the simulation with neglectable interfacial tension, and picture 3 is the real deal (with sigma = 0,072 N/m). The alpha dicts are shown below. I would really appreciate some help. Thanks in advance. Best regards, Vitor Cardoso alpha dict Code:
dimensions [0 0 0 0 0 0 0]; internalField uniform 1; boundaryField { FrontAndBack { type empty; } Inlet { type fixedValue; value uniform 1; } TopWall { type zeroGradient; } Outlet { type zeroGradient; } BottomWall { type zeroGradient; } InnerWalls { type zeroGradient; } } Code:
dimensions [1 -1 -2 0 0 0 0]; internalField uniform 0; boundaryField { Inlet { type zeroGradient; } Outlet { type fixedValue; value uniform 0; } TopWall { type zeroGradient; } BottomWall { type zeroGradient; } InnerWalls { type zeroGradient; } FrontAndBack { type empty; } } Code:
dimensions [0 1 -1 0 0 0 0]; internalField uniform (0 0 0); boundaryField { FrontAndBack { type empty; } Inlet { //type pressureInletVelocity; type fixedValue; value uniform (4e-4 0 0); } TopWall { type noSlip; } Outlet { type zeroGradient; } BottomWall { type noSlip; } InnerWalls { type noSlip; } } |
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August 16, 2023, 10:27 |
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#2 |
New Member
Mike
Join Date: Aug 2023
Posts: 2
Rep Power: 0 |
Hi!
I try to simulate similar process - can you share your geometry (blockMesh) ? |
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