This paper presents the motion of two-phase liquid-gas flow in channels of different geometries, and also the difficulties in description of local resistance of flow. The character of change of value of void fraction in flowing mixture and changes of flow structure and resistance of flow connected with this have been described.
This paper presents the comparison of pressure loss of two-phase liquid-gas flow in vertical channel with sudden expansion. 'I'he impact of direction of movement (up-flow or down-flow) have been described.
The paper presents the results of studies concerning the effects of sudden change of cross-sectional area on the flow patterns and local pressure losses in the horizontal flow of two-phase mixture. The scope of research include the observation of flow patterns of flowing mixture and their disturbances caused sudden change in cross-section of the pipeline. In addition, flow resistance affecting pressure change before and after the local obstacle were measured. The experiment was conducted in a horizontal flow through the measuring channel with a local obstacle in the form of a sudden change in channel cross-sectional area. Measurement channel was a system of two interconnected tubes with internal diameters of 40 and 22 mm and a total length of 7 m. The air, water and oil were used in the experiments. Analysis of the experimental data leads to the conclusion that the mathematical model for calculating the two-phase flow pattern disturbance areas and their impact on the value of the pressure drop in the pipe with a sudden expansion and contraction should take into account both the parameters of the liquid phase and gas phase.
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The paper presents the results of a study involving the impact of sudden change of crosssectional area on the flow patterns and local pressure drops for flow of multi-phase mixture. The experiment was conducted in the conditions of a horizontal and vertical flow through a measuring channel. Pressure drops calculated on the basis Kawahara and Lottes methods are compared with experimental data. A system of two interconnected pipes with internal diameters of 40 and 22 mm as well as 46 and 16 mm and a total length of 7 m formed the measurement channel. The experiments involved air, water and oil.
PL
W pracy przedstawiono wyniki badań dotyczących wpływu gwałtownej zmiany pola przekroju poprzecznego kanału na struktury przepływu oraz miejscowe straty ciśnienia w przepływie mieszaniny wielofazowej. Porównano spadki ciśnienia obliczone na podstawie metod Kawahary i Lottesa z wartościami eksperymentalnymi. Badania prowadzono w warunkach poziomego i pionowego przepływu przez kanał pomiarowy z przeszkodą lokalną. Kanał pomiarowy stanowił układ dwóch rur o średnicach wewnętrznych 40 i 22 mm oraz 46 i 16 mm i całkowitej długości 7 m. Fazę gazową stanowiło powietrze, a fazę ciekłą olej maszynowy i woda.
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