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Surface tension force expression at the wall in fluent

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Old   April 15, 2013, 08:37
Default Surface tension force expression at the wall in fluent
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Hi all,
I was trying to derive the expression for surface tension force at the wall with dynamic contact angle prescribed. As said in the fluent manual the general expression for surface tension force is:

where ,
Now at the wall when contact angle is prescribed the manual says that normal is calculated as follows:

Putting this in the expression for curvature what is the final expression for the volumetric force???
Please help
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