FLUENT udf

#include"udf.h"

#define k_np 36/***thermal conductivity for nanoparticle AL2O3***/

#define FI 0.02/***VOLUME FRACTION***/

DEFINE_PROPERTY(nanofluid_Conductivity,c,t)

{

 real k_f; /*****thermal conductivity for fluid(water)****/

 real k_nf; /****thermal conductivity for nanofluid****/

 real tempe = C_T(c,t); /****temperature****/

k_f=-0.000008*(tempe*tempe)+((0.0062*tempe)-0.5388);

k_f=(((k_np+(2*k_f)-(2*(k_f-k_np))*FI)/(k_np+(2*k_f)+(k_f-k_np)*FI)))*k_f;

return k_nf;

}

DEFINE_PROPERTY(nanofluid_viscosity,c,t)

{

real U_f; /*dynamic viscosity for fluid*/

real U_nf; /*dynamic viscosity for nanofluid*/

real tempe1 = C_T(c,t); /*temperature*/

U_f=2.414*0.00001*pow(10,(247.8/(tempe1-140)));

U_nf=U_f/(pow((1-FI),2.5));

return U_nf;

}

DEFINE_SPECIFIC_HEAT(nanofluid_specificheat,T,Tref,h,yi)

{

real cp,rho_w,rho;

rho_w=(-3.570*(pow(10,-3))*(pow(T,2))+(1.88*T+753.2));

rho=(FI*3970)+((1-FI)*rho_w);

cp=((FI*3970*765)+((1-FI)*rho_w*4200))/rho; /*specific heat of nanoparticles*/

*h=cp * (T-Tref);

return cp;

}

DEFINE_PROPERTY(nanofluid_density,c,t)

{

real tempe,rho_w,rho;

tempe=C_T(c,t);

rho_w=(-3.570*(pow(10,-3))*(pow(tempe,2))+(1.88*tempe+753.2));

rho=(FI*3970)+((1-FI)*rho_w);

return rho;

}

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