The present work reports an experimental and theoretical analysis of the fluid dynamic behavior of oil-water systems flowing through horizontal ducts. In the frame of an ongoing research program, new experimental tests are conducted on smooth, horizontal tubes of Pyrex and Plexiglas. Tap water and mineral oil are used, with a viscosity ratio of about 800 and a density ratio of about 0.9. The resulting database, which includes previous test findings, covers a tube diameter range spanning from 21 to 40 mm. The influence of different parameters on the pressure drop in oil-water flows is evaluated, and some particular behaviors of the pressure drop reduction as a function of the water volume fraction are observed. Flow pattern maps are obtained, which report consistent results of the experimental campaign in terms of flow regimes and transitions. A theoretical analysis based on both Froude and Reynolds numbers is also proposed.
Experimental Analysis of Flow Regime Trasnitions and Pressure Drop Reductions in Oil-Water Mixtures / M. S., Mello; G., Sotgia; Tartarini, Paolo. - STAMPA. - (2003), pp. 155-160. (Intervento presentato al convegno XXI Congresso Nazionale UIT sulla Trasmissione del Calore tenutosi a Udine nel 23-25 Giugno 2003).
Experimental Analysis of Flow Regime Trasnitions and Pressure Drop Reductions in Oil-Water Mixtures
TARTARINI, Paolo
2003
Abstract
The present work reports an experimental and theoretical analysis of the fluid dynamic behavior of oil-water systems flowing through horizontal ducts. In the frame of an ongoing research program, new experimental tests are conducted on smooth, horizontal tubes of Pyrex and Plexiglas. Tap water and mineral oil are used, with a viscosity ratio of about 800 and a density ratio of about 0.9. The resulting database, which includes previous test findings, covers a tube diameter range spanning from 21 to 40 mm. The influence of different parameters on the pressure drop in oil-water flows is evaluated, and some particular behaviors of the pressure drop reduction as a function of the water volume fraction are observed. Flow pattern maps are obtained, which report consistent results of the experimental campaign in terms of flow regimes and transitions. A theoretical analysis based on both Froude and Reynolds numbers is also proposed.
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