Analysis of propagation of disturbances in a two-phase refrigeration medium

• Autorzy: Bohdal T. , Czapp M.
• Języki publikacji: EN

Abstrakty

EN

A theoretical and experimental analysis of propagation of disturbances and determination of propagation velocity in a two-phase refrigeration medium has been made. During investigations on the experimental facility, a step change of the pressure in flow of a refrigerant R404A was induced. The introduced disturbance propagated with a finite velocity depending on the parameters of the medium and, more markedly, on the void fraction. The obtained experimental data were compared with results of calculations based on formulas of other investigators.

Słowa kluczowe

EN

condensation; heat transfer; instabilities; wave phenomena; external disturbances

• Wydawca: Wydawnictwo Instytutu Maszyn Przepływowych PAN
• Czasopismo: Transactions of the Institute of Fluid-Flow Machinery
• Rocznik: 2008
• Tom: nr 121
• Strony: 3--16
• Opis fizyczny: Bibliogr. 15 poz., rys.

Twórcy

autor

Bohdal T.

autor

Czapp M.

• Koszalin University of Technology, Chair of Thermal Engineering and Refrigerating Engineering, Raclawicka 15-17, 75-620 Koszalin, Poland,

Bibliografia

• [1] Bohdal T., Bilicki Z., Czapp M.: Development of nucleate boiling in an annular clearance, Int. J Heat and Technology, Vol. 19-n, No. 2, 2001, 33-37.
• [2] Bohdal T.: Investigation of boiling of refrigerating medium under conditions of impulse disturbances, Int. J Experimental Heat Transfer, Vol. 19, No. 2, 2004, 103-117.
• [3] Bohdal T., Charun H., Czapp M.: Compressor refrigeration units. Theoretical background and principles of calculations, WNT, Warszawa 2003.
• [4] Bohdal T., Kuczyński W.: Investigation of boiling of refrigeration medium under periodic disturbance conditions, Int. J. Experimental Heat Transfer, Vol. 18, No. 3, 2005, 135-151.
• [5] Bohdal T.: Reasons of instability of phase changes in energy conversion media, Monographic edition, Technical University of Koszalin, Koszalin 2006.
• [6] Bohdal T., Czapp M.: Analysis of displacement of disturbances in a two-phase medium, Heat Transfer and Renewable Sources of Energy 2006, Międzyzdroje, 13 - 16.09.2006.
• [7] Czapp M.: Phase changes of refrigeration media in coil tube heat exchangers, Monographic edition, Technical University of Koszalin, Koszalin 2002.
• [8] Du X.Z., Wang B.X.: Study on transport phenomena for flow film condensation in vertical mini-tube with interfacial waves, Int. J. of Heat and Mass Transfer 2003, Vol. 46, 2095-2101.
• [9] Falk K., Hervieu E., Gudmundsson J.S.: Pressure pulse and void fraction propagation in two-phase flow: Experiments for different flow regimes, Proc. of the 2nd Int. Symp. on Two-Phase Flow Modelling and Experimentation, Pisa, Italy, May 23 - 25, 1999, Edizioni ETS, Pisa, Volume I, 629-636.
• [10] Kuznetsov V.V., Vitovsky O.V.: The pressure wave with complete vapor condensation in flow boiling , Proc. of the 5th World Conf. on Experimental Heat Transfer, Fluid Mechanics and Thermodynamics, TheSaloniki, Greece, 27-30 September 2001, Edizioni ETS Pisa, Italy, 1865-1870.
• [11] Mitrovic J., Fauser J.: Propagation of two-phase fronts during boiling of superheat liquids, Proc. 2nd European Symp. "Fluids in Space", Naples, Italy, 1996.
• [12] Nakoryyakov V.E., Pokusaev B.G., Shreiber I.R.: Wave propagation in gas liquid media, Bergles A.E. (Editor) by CRC Press Inc., Boca Raton, Florida, 1993.
• [13] Nguyen D.L., Winter E.R.F., Greiner M.: Sonic velosity in two-phase system, Int. J. Multiphase Flow, Vol. 7, No. 3, , 1981, 321-336.
• [14] Park S.K., Kim M.H., Yoo K.J.: Condensation of pure steam and steam- air mixture with surface waves of condensate film on a vertical wall, Int. J. Multiphase Flow, Vol. 22, No. 5, 1996, 893-908.
• [15] Pavlenko A.N., Lei V.V.: Model of self-maintaining evaporation front for superheat liquids, Proc. of the Third Int. Conf. on Multiphase Flow, ICMF'98, Lyon, France, June 8-12.1998, 366-374.