Minimal dissipation rate approach to correlate phase inversion data |
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Authors: | P Poesio GP Beretta |
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Institution: | Università di Brescia, Via Branze 38, 25123 Brescia, Italy |
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Abstract: | Phase inversion refers to the phenomenon whereby a small change in operational flow conditions causes an oil-in-water dispersed flow pattern to suddenly switch to a water-in-oil flow pattern, and viceversa. This paper proposes an interpretation of phase inversion in terms of minimal dissipation rate. To this end, the dissipation rate is computed by a simple homogeneous model together with available correlations for effective viscosity in dispersed flows. It is shown that the data available in the literature can be reasonably interpreted as a manifestation of minimal dissipation rate. Furthermore, if the assumed effective viscosity correlations take into account pipe wettability, the minimal dissipation rate approach is capable to interpret also the so-called ambivalent range (hysteresis effect) and correlate the available data. |
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Keywords: | Minimal dissipation rate Phase inversion Oil&ndash water mixtures |
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