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Temperature dependent SURFACE TENSION TEMPERATURE COEFFICIENT

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Old   February 20, 2016, 05:08
Exclamation Temperature dependent SURFACE TENSION TEMPERATURE COEFFICIENT
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Ganesh K C
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Dear Fluent user,
i am solving TIG welding simulation using fluent. i need to assign temperature dependent surface tension temperature coefficient for Marangoni convection. but there is a provision to use constant value. how can i use temperature dependent data ? kindly help me out in this boundary condition.
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Old   November 22, 2016, 18:01
Default Surface Tension Coefficient UDF
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Amin Ebrahimi
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Quote:
Originally Posted by kcgmech View Post
Dear Fluent user,
i am solving TIG welding simulation using fluent. i need to assign temperature dependent surface tension temperature coefficient for Marangoni convection. but there is a provision to use constant value. how can i use temperature dependent data ? kindly help me out in this boundary condition.
Dear Ganesh,

You need a UDF to define surface tension temperature coefficient.

/************************************************** *************
Surface Tension Coefficient UDF for the VOF Multiphase Model
************************************************** *************/

#include "udf.h"
DEFINE_PROPERTY(sfc, c, t)
{
real T = C_T(c,t);
return 1.23 - 0.004*T + 5.0e-6*T*T;
}
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