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Experimental verification of classical methods of calculation the resistance of adiabatic two-phase flow in minipipes
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Przedstawiono wyniki badań eksperymentalnych oporów dwufazowego przepływu adiabatycznego mieszaniny woda-powietrze w minikanałach rurowych. W badaniach zastosowano osiem minikanałów rurowych o średnicy wewnętrznej dw =1,05-2,30 mm i długości odcinka testowego 300 mm wykonanych ze stali nierdzewnej. Badania przeprowadzono w zakresie parametrów: masowe natężenie przepływu wody 0,65-59 kg/h i powietrza 0,011-0,72 kg/h, udział masowy powietrza w mieszaninie dwufazowej x = 0,0003-0,22, gęstość strumienia masy mieszaniny (wp) = 139-8582 kg/(m2-s). Na podstawie badań eksperymentalnych wykazano, że wykorzystanie klasycznych metod obliczenia oporu przepływu dwufazowego, w tym metod Lockharta-Martinelli'ego oraz Friedel'a sprawdzonych dla kanałów konwencjonalnych, bezpośrednio do minikanałów ma bardzo ograniczone możliwości. Konieczne jest stosowanie poprawek i modyfikacji dla minikanałów.
Article presents results of experimental investigations of resistance adiabatic air - water mixture flow through nimi-pipes. Eight minichannels with internal diameter dw = 1,05-2,30 mm and length of test section 300 mm executed from stainless steel was used. Expe-rimental investigations were conduced in range of parameters: the mass flow rate of water 0,65—59 kg/h, mass flow rate of air 0,011-0,72 kg/h, quality of two-phase mixture x = 0,0003-0,22, mass flux of mixture (wp) = 139-8582 kg/(m2-s). On basis of experimental investigations it can be shown, that the utilization the classical methods of calculation the resistance of two-phase, with use the methods Lockhart-Martinelli as well as Friedel checked for conventional channels, has very limited possibilities. It was confirmed, that for minichannels using new or corrected models is required.
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Tom
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14--21
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Bibliogr. 24 poz., rys.
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Bibliografia
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Bibliografia
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bwmeta1.element.baztech-article-BPG8-0002-0013