CFD modelling of laminar film and spontaneous condensation in presence of noncondensable gas

• Autorzy: Karkoszka K. , Anglart H.
• Języki publikacji: EN

Abstrakty

EN

A new mechanistic model for prediction of wall condensation in presence of noncondensable gas is presented. The model is based on the resolution of flow and temperature fields in the boundary layer to allow for prediction of diffusion and accumulation of noncondensable gas in the vicinity of a liquid film. Additionally, when the temperature in the vapour gas mixture drops locally below the critical value defined by the Wilson's line, the fog formation is modelled. Both accumulation of noncondensable gas and fog formation can significantly influence the heat transfer process and thus they must be carefully modelled in many industrial applications. In particular, the degradation of heat transfer rates has an essential influence on the performance of safety systems in nuclear power plants. The present model has been implemented into a commercial computational fluid dynamics code CFX-4.

Słowa kluczowe

EN

CFD; condensation; heat transfer; multiphase flow; noncondensable gas; nuclear safety

PL

bezpieczeństwo nuklearne; CFD; gaz niekondensatowy; kondensacja; przepływ wielofazowy; wymiana ciepła

• Wydawca: Wydawnictwo Instytutu Maszyn Przepływowych PAN ; Komitet Termodynamiki i Spalania PAN
• Czasopismo: Archives of Thermodynamics
• Rocznik: 2006
• Tom: Vol. 27, no. 2
• Strony: 23--36
• Opis fizyczny: Wykr., wz.,Bibliogr. 11 poz.,

Twórcy

autor

Karkoszka K.

autor

Anglart H.

• Nuclear Reactor Technology, School of Engineering Sciences, Royal Institute of Technology, SE-106 91, Stockholm, Sweden

Bibliografia

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• [5] GHIAASIAAN, S.M., KAMB0J, B.K., ABDEL-KHALIK, S.I.: Two-fluid modeling of the condensation in the presence of non-condensable gas in two-phase flows, Nucl. Sci. Eng., 119 (1995), 1-17.
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• [7] MARTIN-VALDEPENAS, J.M., JIMENEZ, M.A., MARTIN-FUERTES, F., FERNANDEZ-BENITEZ, J.A.: Comparison of film condensation models in presence of non-candensable gases implemented in a CFD code, Heat Mass Transfer, 41 (2005), 961-976.
• [8] MIKIELEWICZ J., RAGEB A.M.A.: Simple theoretical approach to direct-contact condensation on subcooled liquidfilm, Int. J. Heat Mass Transfer, Vol. 38 (1995), 557-562.
• [9] SPARROW, E.M., LIN, S.H.: Condensation heat transfer in the presence of non-condensable gas, J. Heat Transfer 86 1964, 430-436.
• [10] SPARRO, E.M., MINKOWYCZ, W.J., SADDY, M.: Forced convection in the presence of a non-condensable gas, Int. J. Heat Mass Transfer, 10 1967, 1829-1845.
• [11] STEVANOVIC V.D., STOSIC Z.V., STOLL U.: Condensation induced non-condensable accumulation in a non-vented pipe, Int. J. of Heat and Mass Transfer, 48 (2005), 83-103.