Analizar y comparar, el fenómeno de condensación por contacto directo, mediante simulación por CFD entre una tobera convergente - divergente de vapor y una flauta de flujo de vapor.
A simulation model of direct contact condensation DCC, of steam jets in stationary liquid water is presented. The analysis takes as a baseline the studies of phase change by nucleation given by Borishanski and the thermal behavior of the fluid that is supported by the thermal theory of Clausius Clap...
| Autor Principal: | Moreno Zalme, Diego Alejandro |
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| Otros Autores: | Andino Suárez, Alexis Eduardo |
| Formato: | bachelorThesis |
| Idioma: | spa |
| Publicado: |
2018
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| Materias: | |
| Acceso en línea: |
http://dspace.ups.edu.ec/handle/123456789/15776 |
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| Sumario: |
A simulation model of direct contact condensation DCC, of steam jets in stationary liquid water is presented. The analysis takes as a baseline the studies of phase change by nucleation given by Borishanski and the thermal behavior of the fluid that is supported by the thermal theory of Clausius Clapeyron. It is possible to determine the change of phase of vapor to liquid through the formation of annular flow between the surface of the steam and water, the dependence of the change of phase is fulfilled while the differential of temperature is maintained, according to the laws of transport Fick of dough. The numerical study was carried out with CFD tools, computational fluids dynamics, supported with the Navier-Stokes equations using the Lee model of evaporation and condensation, in this way, the thermal and mass relationship of a new biphasic flow was obtained. The result is validated with the evident dependence of the steam jet on the differentiation of the Reynolds number, which allows to relate the rate of variation of mass with the thermal diffusivity evaluated in Prandtl. The numerical study corroborates the existing advances of the interfacial friction factor in the phase change, thus allowing to know the thermodynamic parameters of the phenomenon under established initial conditions. The steam injectors used to check the phenomenon are converging-diverging nozzle and steam flute, models IN15 and IN40M manufactured by SpiraxSarco®. The stable working speeds are 2836,66 ms-1 and 500 ms-1, 8 comparative cases were made with different speeds outside the manufacturer's recommendations. The results are corroborated with contour analysis of vapor volume fraction, density, pressure and velocity, compared between all the assigned cases. |
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