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Warianty tytułu
Measurements of two phase pressure drop in minichannels
Języki publikacji
Abstrakty
W artykule przedstawiono wyniki badań oporów przepływu mieszaniny woda-powietrze w minirurkach. W badaniach zastosowano 10 minirurek ze stali nierdzewnej o średnicy wewnętrznej dw = 0,64 ÷ 2,30 mm. Badania przeprowadzono w zakresie parametrów: masowe natężenie przepływu wody 0,15 ÷ 59 kg/h, powietrza 0,004 ÷ 0,7 kg/h, udział masowy powietrza w mieszaninie dwufazowej x = 0,0003 ÷ 0,22, gęstość strumienia masy mieszaniny (w?) = 46 ÷ 8582 kg/(m2os). Wykazano brak możliwości wykorzystania klasycznych metod obliczenia oporu przepływu dwufazowego.
The paper presents results of experimental investigations of frictional pressure drop in minichannels. Air-water mixture was used as working fluid. The test section was made from stainless-steel pipes of internal diameters equal to 0.64, 1.05, 1.10, 1.30, 1.35, 1.40, 1.60, 1.68, 1.94 and 2.30 mm. Investigations were performed for mass flux of 46 ÷ 8582 kg/(m2 s) and gas quality from 0.0003 to 0.22. The superficial velocity ranges of water and air were 0.1 ÷ 8.6 m/s and 0.9 ÷ 63.9 m/s, respectively. The results of experimental investigations were compared with the theoretical values obtained from the homogeneous equilibrium model (HEM). The dynamic viscosity coefficient was calculated using correlations proposed by: Owens, Mc Adams, Ackers, Cicchitti, Dukler, Beattie & Whaley, Lin. It was found that none of the tested correlations could predict the two-phase pressure drop satisfactorily. Even though there exist papers which confirm the suitability of the classical separated flow methods of Lockhart-Martinelli and Friedel for calculations of the frictional pressure drop of the two-phase flow in minichannels, the experimental study conducted by the author confirms the existence of substantial limitations. The classical correlations of Lockhart-Martinelli and Friedel can be only treated as primary estimation of resistances in the adiabatic two-phase flow in tubular minichannels. Experiments confirmed the need for introducing corrections and modifications to the classical method to obtain results reliable in case of minichannels.
Wydawca
Czasopismo
Rocznik
Tom
Strony
507--511
Opis fizyczny
Bibliogr. 25 poz., rys., tab., wzory
Twórcy
autor
- Politechnika Koszalińska, ul. Racławicka 15-17, 75-620 Koszalin, krzysztof.dutkowski@tu.koszalin.pl
Bibliografia
- [1] Mauro A. W., Quiben J. M., Mastrullo R., Thome J. R.: Com-parison of experimental pressure drop data for two phase flows to prediction methods using a general model. Int. Journal of Refrigeration, 2007, vol. 30, s. 1358-1367.
- [2] Pettersen J.: Flow vaporization of CO2 in microchannel tubes, Experimental Thermal and Fluid Science, 2004, vol. 28, s. 111-121.
- [3] Sobierska E., Kulenovic R., Mertz R., Groll M.: Experimental results of flow boiling of water in a vertical microchannel. Experimental Thermal and Fluid Science, 2006, vol. 31, s. 111-119.
- [4] Kawahara A., Chung P. M. -Y., Kawaji M.: Investigation of two-phase flow pattern, void fraction and pressure drop in a microchannel. Int. Journal of Multiphase Flow, 2002, vol. 28, s. 1411-1435.
- [5] Kawahara A., Sadatami M., Okayama K., Kawaji M.: Effects of liquid properties on pressure drop of two-phase gas-liquid flow through a microchannel. First International Conference on Microchannels and Minichannels, New York, 2003.
- [6] Hibiki T., Hazuku T., Takamasa T., Ishii M.: Some characteris-tics of developing bubbly flow in a vertical mini pipe. Int. Journal of Heat anf Fluid Flow, 2007, vol. 28, s. 1034-1048.
- [7] Mishima K., Hibiki T.: Some characteristics of air-water two-phase flow in small diameter vertical tubes. Int. Journal of Multiphase Flow, 1996, vol. 22, s. 703-712.
- [8] Lee H. J., Lee S. Y.: Pressure drop correlations for two-phase flow within horizontal rectangular channels with small heights. Int. Journal of Multiphase Flow, 2001, vol. 27, s. 783-796.
- [9] Pehlivan K., Hassan I., Vaillancourt M.: Experimental study on two-phase flow and pressure drop in millimeter-size channels. Applied Thermal Engineering, 2006, vol. 26, s. 1506-1514.
- [10] Chung P. M. -Y., Kawaji M.: The effect of channel diameter on adiabatic two-phase flow characteristics in microchannels, Int. Journal of Multiphase Flow, 2004, vol. 30, s. 735-761.
- [11] Zhao T. S., Bi Q. C.: Pressure drop characteristics of gas-liquid two-phase flow in vertical miniature triangular channels. Int. Journal of Heat and Mass Transfer, 2001, vol. 44, s. 2523-2534.
- [12] Triplett K. A., Ghiaasiaan S. M., Abdel-Khalik S. I., LeMouel A., McCord B. N.: Gas liquid two-phase flow in microchannels. Part II: void fraction and pressure drop. Int. Journal of Multiphase Flow, 1999, vol. 25, s. 395-410.
- [13] Kaminaga F., Sumith B., Matsumura K.: Pressure drop in capillary tube in boiling two-phase flow. First International Conference on Microchannels and Minichannels, New York, 2003.
- [14] Shin J. S., Kim M. H.: An experimental study of condensation heat transfer inside a mini-channel with a new measurement technique. Int. Journal of Multiphase Flow, 2004, vol. 30, s. 311-325.
- [15] Dutkowski K.: Air-water two-phase frictional pressure drop in minichannels. Heat Transfer Engineering, 2010, vol. 31, s. 321-330.
- [16] Dutkowski K.: Two-phase pressure drop of air–water in minichannels, Int. Journal of Heat and Mass Transfer, 2009, vol. 52, s. 5185-5192.
- [17] Dutkowski K.: Modyfikacja metody Lockharta-Martinelliego obliczania oporów przepływu adiabatycznego przez minikanały. Część 1, Chłodnictwo, 2008, nr 7, str. 6-11.
- [18] Lee J., Mudawar I.: Two-phase flow in high-heat-flux micro-channel heat sink for refrigeration cooling applications: Part I - pressure drop characteristics. Int. Journal of Heat and Mass Transfer, 2005, vol. 48, s. 928-940.
- [19] Wongwises S., Pirompak W.: Flow characteristics of pure refrigerants and refrigerant mixtures in adiabatic capillary tubes, Applied Thermal Engineering, 21, 2001, s. 845-861.
- [20] Chen I. Y., Yang K. -S., Wang C. -C.: An empirical correlation for two-phase frictional performance in small diameter tubes. Int. Journal of Heat and Mass Transfer, 2002, vol. 45, s. 3667-3671.
- [21] Choi K. -I., Pamitran A. S., Oh C. -Y., Oh J. -T.: Two-phase pressure drop of R-410A in horizontal smooth minichannels. Int. Journal of Refrigeration, 2008, vol. 31, s. 119-129.
- [22] Qu W., Mudawar I.: Measurement and prediction of pressure drop in two-phase micro-channel heat sink. Int. Journal of Heat and Mass Transfer, 2003, vol. 46, s. 2737-2753.
- [23] Vassallo P., Keller K.: Two-phase frictional pressure drop multipliers for SUVA R-134a flowing in a rectangular duct. Int. Journal of Multiphase Flow, 2006, vol. 32, s. 466-482.
- [24] Abdelall F. F., Hahn G., Ghiaasiaan S. M., Abdel-Khalik S. I., Jeter S. S., Yoda M., Sadowski D. L.: Pressure drop caused by abrupt flow area changes in small channels, Experimental Thermal and Fluid Science, 29, 2005, s. 425-434.
- [25] Revellin R., Thome J. R.: Adiabatic two-phase frictional pressure drops in microchannels, Experimental Thermal and Fluid Science, 31, 2007, s. 673-685.
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-article-BSW4-0081-0033