Tytuł artykułu
Autorzy
Wybrane pełne teksty z tego czasopisma
Identyfikatory
Warianty tytułu
Języki publikacji
Abstrakty
The interest area covered the issues of heat transfer to the subcooled working fluid (refrigerant R-123) flowing upward through a narrow rectangular channel (1 x 40 x 360 mm), vertically oriented with one wall heated uniformly and others approximately adiabatic. Liquid crystals thermography was applied to determine two-dimensional temperature distribution on the heating surface. The current study concentrated on heat transfer transition phenomenon during laminar flow, from single phase convection, to boiling incipience and further, to fully developed nucleate boiling. Particular attention was paid to boiling incipience coditions. Experimental investigations were meant to specify the location of the "boiling front", which demonstrated that the phenomenon callud "nucleation hysteresis" or "zero boiling crisis" took place when the boiling incipience occurred. Observations of the hysteresis phenomena, including the impact of various factors (the liquid subcooling at inflow, flow velocity and pressure) on the incipience boiling in narrow channels were also presented. Results are shown in the form of boiling curves plotted for selected points in the channel where heat flux density depends on the heating surface superheating T[w]-T[sat]. The shapes of the curves, in which "nucleation hysteresis" or "zero boiling crisis" are visible, were analysed. The correlation concerning the determination of heat transfer coefficient for refrigerant R-123 boiling incipience in a narrow vertical channel was put forward.
Słowa kluczowe
Czasopismo
Rocznik
Tom
Strony
19--35
Opis fizyczny
Bibliogr. 7 poz.,
Twórcy
autor
- Politechnika Świętokrzyska, Kielce
autor
- Politechnika Świętokrzyska, Kielce
Bibliografia
- [1] PIASECKA M.: Theoretical and Experimental Investigations into Flow Boiling Heat Transfer in a Narrow Channel, Ph. D. Thesis, Dept. of Mechanical Eng., Kielce University of Technology, Kielce 2002, (in Polish).
- [2] BILICKI Z.: The relation between the experiment and theory for nucleate forced boiling, Proc. 4th World Conf. on Exp. Heat Transfer, Fluid Mechanics and Thermodynamics, Brussels, (Eds. M. Giot, F. Mayinger, G. P. Celata), Edizioni ETS Pisa, 2(1997), 571-578.
- [3] BOHDAL T.: Development of bubbly boiling in channel flow, Exp. Heat Transfer 14(2001), No. 3, 199-215.
- [4] PIASECKA M., PONIEWSKI M. E.: Hysteresis phenomena at the onset of subcooled nucleate flow boiling in microchannels, submitted for publ. in Proc. of 1st Int. Conf. on Microchannels and Minichannels, 24-25.04.2003, Rochester, NY, USA.
- [5] PONIEWSKI M. E.: Nucleate Boiling on Developed Micro-Surfaces, Series Mechanics, Monograph No. 23, Kielce University of Technology Publishing House, Kielce 2001, (in Polish).
- [6] PIASECKA M., HOŻEJOWSKA S., PONIEWSKI M. E.: Determination of local flow boiling heat transfer coefficient in narrow channel, Archives of Thermodynamics, Vol. 24(2003), No. 2, 55-67.
- [7] MCLINDEN M. O.: Tables and Diagrams for the Refrigeration Industry. Thermodynamic and Physical Properties, Int. Institute of Refrigeration, France 1995.
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-article-BGPK-0638-2995