[seanread]

I'm trying to simulate heat and vapour transfer in a complex geometry (nasal cavity).

I'm using species transport to simulate the vapour transfer, but would like to account for the latent heat of evaporation.

I'm thinking a udf to modify the heat flux term seems like the right direction but I'm not so confident with udf writing, and not sure how to go about it.

I found this online for heat flux coefficient modification:

/***********************************************************************/
/* UDF for specifying the diffusive heat flux between a wall and      
*/
/* neighboring cells                                                  
*/
/***********************************************************************/

#include "udf.h"

static real h = 0.;             /* heat transfer coefficient (W/m^2 C)
*/

DEFINE_ADJUST(htc_adjust, domain)
{
  /* Define the heat transfer coefficient. */

  h = 120;
}

DEFINE_HEAT_FLUX(heat_flux, f, t, c0, t0, cid, cir)
{
  cid[0] = 0.;
  cid[1] = h;
  cid[2] = h;
  cid[3] = 0.;
}

I would think that I could maybe modify this, for example,

cid[0] = -Latent heat of evaporation * water flux,

but I'm not sure how to pair my water flux variable to the value calculated in fluent. Can someone point me in the right direction with this?

thanks,

Sean

[seanread]

no takers on this?

[amasugi14]

Hi, im doing almost same simulation as yours (airflow pattern within nasal cavity). I am also having some problems regarding the humidty. Maybe we could discuss more to gain some insights. Please email me if you interested, amasugi14@yahoo.co.