Thermal stability and development of film boiling sites. Experiment and modeling

• Autorzy: Pavlenko A. , Starodubtseva I.
• 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 development of one-dimensional (1D) and two-dimensional (2D) sites of film boiling has been studied numerically. To present the valid boundary conditions at the front of the boiling regimes transition, we introduced the dimensionless parameter ε which characterized the ratio between the width of the temperature front along a heat-releasing surface and the linear scale of the capillary forces' action. Here, we present the calculations of stability zones from the film boiling sites depending on their initial sizes, and the dynamic characteristics of development for the different heat flux densities. Simulations were carried out with various boundary conditions within two- and three-zone shape of the boiling curve. Different values of parameter ε were used in these simulations. While describing the dynamics of the front of boiling regime change in the calculation model, the authors take into account the non-stationary character of heat transfer in the zone of bubble boiling caused by temperature pulsations during the growth and detachment of vapor bubbles. We obtained experimental values for the equilibrium density of heat flux in nitrogen. These data were compared with our calculations.

Słowa kluczowe

EN

film and bubble boiling regimes; propagation velocity; heat stability

• Wydawca: Wydawnictwo Politechniki Świętokrzyskiej
• Czasopismo: Zeszyty Naukowe Politechniki Świętokrzyskiej. Mechanika
• Rocznik: 1999
• Tom: Z. 67
• Strony: 313--322
• Opis fizyczny: Bibliogr. 7 poz., rys., wykr., wzory

Twórcy

autor

Pavlenko A.

• Institute of Thermopysics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Lavrentyev Ave., 1, 630090, Russia

autor

Starodubtseva I.

• Institute of Thermopysics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Lavrentyev Ave., 1, 630090, Russia