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Non-physic results filling microchannel model
Posted 4 mai 2012, 04:23 UTC−4 Fluid & Heat, Microfluidics, Modeling Tools & Definitions, Parameters, Variables, & Functions Version 4.2a 1 Reply
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I've just started working with comsol and want to simulate the effect of the contact angle on the filling of a microchannel with water.
I'm using the multiphase flow, level set method and have attached the model.
The problem is that when the contact angle of the walls change from 15 degrees to 180 degrees the waterfront should stop as there is no pressure added, however the results show that the channel keeps on filling itself.
I tried to change a lot of settings to see if that works better, but I'm pretty much stuck now.
Could anyone have a look at my model and see if they can tell me what's wrong with the model?
Thank you.
I'm using the multiphase flow, level set method and have attached the model.
The problem is that when the contact angle of the walls change from 15 degrees to 180 degrees the waterfront should stop as there is no pressure added, however the results show that the channel keeps on filling itself.
I tried to change a lot of settings to see if that works better, but I'm pretty much stuck now.
Could anyone have a look at my model and see if they can tell me what's wrong with the model?
Thank you.
Attachments:
1 Reply Last Post 5 mai 2012, 04:34 UTC−4
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Posted:
1 decade ago
Hi,
The flow of liquid outside the point of change of the contact angle is caused by the inertial force.
To get more accurate results you should use a denser mesh.
If the channel has circular cross-section you should use 2Daxi modeling instead of 2D.
2D is suitable if the fluid flows between two parallel plates.
Regards,
Andrzej
The flow of liquid outside the point of change of the contact angle is caused by the inertial force.
To get more accurate results you should use a denser mesh.
If the channel has circular cross-section you should use 2Daxi modeling instead of 2D.
2D is suitable if the fluid flows between two parallel plates.
Regards,
Andrzej