Predictions of critical mass velocities in flashing water flow by means of second gradient model

• Autorzy: Badur J. , Banaszkiewicz M. J.
• Konferencja: International Conference on Heat Transfer and Transport Phenomena in Multiphase Systems HEAT '99 (2; 18-22.05.1999; Kielce, Poland)
• Języki publikacji: EN

Abstrakty

EN

The paper deals with numerical predictions of critical mass fluxes in two-phase water-steam flows. Special emphasis is laid on the predictions of critical flow rates for nonequilibrium water-steam mixtures. A new mathematical model has been proposed which takes into account the influence of interfaces on mass, momentum and energy transfer. It is a quasi-one-dimensional model for adiabatic channel flows. In order to determine critical mass flux the so-called natural choking criterion has been employed (PIF - possible-impossible flow). Such obtained numerical results have been compared with the results of two benchmark experiments on two-phase critical flows - Moby Dick and BNL. A reasonably good agreement between the predictions of the theoretical model and the experiments has been found.

Słowa kluczowe

EN

choking; flashing flow; thermodynamic nonequilibrium

• Wydawca: Wydawnictwo Politechniki Świętokrzyskiej
• Czasopismo: Zeszyty Naukowe Politechniki Świętokrzyskiej. Mechanika
• Rocznik: 1999
• Tom: Z. 67
• Strony: 163--172
• Opis fizyczny: Bibliogr. 15 poz., wykr., wzory

Twórcy

autor

Badur J.

• Institute of Fluid-Flow Machinery PAS, ul. Fiszera 14, PL-80952 Gdańsk

autor

Banaszkiewicz M. J.

• Institute of Fluid-Flow Machinery PAS, ul. Fiszera 14, PL-80952 Gdańsk