Two-phase flows of liquid (water) – gas (air, vapor, steam) throughout singularities have been widely investigated both by experimental and theoretical approaches. On the contrary, there are very few works dealing with liquid – liquid mixtures, such as water – light/heavy hydrocarbons, even though their industrial interest is not negligible. In particular, both experimental data and numerical models are available for oil-water flows almost only in horizontal straight pipes. To extend the knowledge in such a field, an experimental investigation was carried out about tap water and high viscosity oil (density 890 kg/m3, viscosity 0.838 Pa s at 20 °C, surface tension 0.035 N/m) two-phase flows within pipes including sudden area contractions. Flow pattern, pressure gradient and concentrated pressure drop were analyzed for two test sections, with a sudden contraction 50/40 mm i.d. and with a 50/30 mm i.d. respectively. Models and correlations for the prediction of the pressure variations were tested, both developed for oil-water and gas-water flows. No one gave good agreement with the experimental data, and particularly the gas-liquid ones heavily failed. Therefore, the need of deepening the experimental database appears of utmost importance also in order to formulate appropriated flow models.

Concentrated pressure drop across sudden diameter contractions of oil-water flows in horizontal pipes: an experimental investigation

COLOMBO, LUIGI PIETRO MARIA;GUILIZZONI, MANFREDO GHERARDO;SOTGIA, GIORGIO MARCO;
2013

Abstract

Two-phase flows of liquid (water) – gas (air, vapor, steam) throughout singularities have been widely investigated both by experimental and theoretical approaches. On the contrary, there are very few works dealing with liquid – liquid mixtures, such as water – light/heavy hydrocarbons, even though their industrial interest is not negligible. In particular, both experimental data and numerical models are available for oil-water flows almost only in horizontal straight pipes. To extend the knowledge in such a field, an experimental investigation was carried out about tap water and high viscosity oil (density 890 kg/m3, viscosity 0.838 Pa s at 20 °C, surface tension 0.035 N/m) two-phase flows within pipes including sudden area contractions. Flow pattern, pressure gradient and concentrated pressure drop were analyzed for two test sections, with a sudden contraction 50/40 mm i.d. and with a 50/30 mm i.d. respectively. Models and correlations for the prediction of the pressure variations were tested, both developed for oil-water and gas-water flows. No one gave good agreement with the experimental data, and particularly the gas-liquid ones heavily failed. Therefore, the need of deepening the experimental database appears of utmost importance also in order to formulate appropriated flow models.
Atti del XXXI Congresso Nazionale UIT sulla Trasmissione del Calore
97888-6493-017-6
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11311/749001
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