# Temperature dependent SURFACE TENSION TEMPERATURE COEFFICIENT

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 February 20, 2016, 05:08 Temperature dependent SURFACE TENSION TEMPERATURE COEFFICIENT #1 New Member   Ganesh K C Join Date: Oct 2014 Location: Tiruchirappalli, India Posts: 29 Rep Power: 4 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. __________________ -- K.C.Ganesh Research Scholar NIT Trichy India

November 22, 2016, 18:01
Surface Tension Coefficient UDF
#2
New Member

Amin Ebrahimi
Join Date: Jun 2012
Location: Delft, Netherlands
Posts: 3
Rep Power: 7
Quote:
 Originally Posted by kcgmech 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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