{"id":157745,"date":"2020-11-30T05:43:17","date_gmt":"2020-11-30T05:43:17","guid":{"rendered":"\/forum\/forums\/topic\/udf-for-definining-saturation-temperature-as-a-function-of-pressure-2\/"},"modified":"2020-12-04T19:56:25","modified_gmt":"2020-12-04T19:56:25","slug":"udf-for-definining-saturation-temperature-as-a-function-of-pressure-2","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/udf-for-definining-saturation-temperature-as-a-function-of-pressure-2\/","title":{"rendered":"UDF for definining saturation temperature as a function of pressure"},"content":{"rendered":"
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Hello <\/p>\n

<\/p>\n<\/p>\n

I am trying to simulate a bulk condensation phenomena where vapor condenses to liquid when it reaches below saturation temperature. I am trying to do this using evaporation\/condensation model in ansys fluent. Is this correct ? <\/p>\n

<\/p>\n<\/p>\n

Also I am trying to define the saturation temperature in Lee condensation model with following UDF<\/p>\n

Is the following UDF correct?<\/p>\n

<\/p>\n<\/p>\n

#include "udf.h"<\/p>\n

#define h2o 0<\/p>\n

DEFINE_PROPERTY(sattemprev,c,t)<\/p>\n

{<\/p>\n

real sat_t;<\/p>\n

real abs_p;<\/p>\n

real vapor_p;<\/p>\n

real mf_vapor =C_YI(c,t,0) ;<\/p>\n

real static_p = C_P(c,t);<\/p>\n

real operating_p = RP_Get_Real ("operating-pressure");<\/p>\n

abs_p = static_p + operating_p;<\/p>\n

vapor_p = mf_vapor * abs_p;<\/p>\n

sat_t = ((243.04*((double)log10((double)vapor_p\/0.61094)))\/(17.625-((double)log10((double)vapor_p\/0.61094))))+273.15;<\/p>\n

return sat_t;<\/p>\n

}<\/p>\n","protected":false},"template":"","class_list":["post-157745","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t