By using evaporation and condensation model, we can convert water into vapor (saturation temperature and heat input to evaporator ). But how to convert vapor into water in condenser section? Is it possible by Fluent? Is there need of of UDF with negative heat transfer in condenser section?
HELLO
You can see my article "Numerical study of a small concentration of condensing vapor inside a vertical tube" Heat and Mass Transfer September 2012, Volume 48, Issue 9, pp: (1675-1685) "or my book" Heat and Mass Transfer During condensation
LAP LAMBERT Academic Publishing (2015-08-24) ISBN-13: 978-3-659-76028-0 "
Here you will find all what is related with your questions.
and you can see:
/* UDF to define a simple mass transfer based on Saturation
Temperature. The "from" phase is the gas and the "to" phase is the
liquid phase */
#include "udf.h"
DEFINE_MASS_TRANSFER(liq_gas_source,cell,thread,from_index,
from_species_index, to_index, to_species_index)
{
real m_lg;
real T_SAT = 373;
Thread *gas = THREAD_SUB_THREAD(thread, from_index);
Thread *liq = THREAD_SUB_THREAD(thread, to_index);
m_lg = 0.;
if (C_T(cell, liq) >= T_SAT)
{
m_lg = -0.1*C_VOF(cell,liq)*C_R(cell,liq)*
fabs(C_T(cell,liq)-T_SAT)/T_SAT;
}
if ((m_lg == 0. ) && (C_T(cell, gas)
It's one of the possibilities UDF.
I modeled the entire heat pipe model mixture. Try ansys guide. As for the formation of the mixture and its production is for example described in chapter 16.1.1.1. the User Guide for Fluent 14. Specific application examples are given for example. Chapter 16 Tutorial guide for Fluent 14, wherein the reaction is considered even in the gas phase.
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