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1997b) presented data obtained from experiments in a 3 mm inner diameter horizontal glass pipe. 17 · 10−3 P a · s at 25◦ C. The results showed that an injection of a small amount of water, compared to the oil flow rate, produces a sensible reduction of the pressure drop. 8 mm and 18 1. 4 mm inner diameter horizontal pipes made of stainless steel and acrylic resin, respectively; Bannwart (2001) described this effect thoroughly with respect to the transportation of crude oil in pipelines. Nadler (1996) shows experimental data of oil water flows in a 59 mm inner diameter perspex pipe.

They divided the observed flow patterns in two groups, segregated and dispersed flows. Each group is further subdivided. Additionally, the first complete model for predicting oil-water flow pattern transitions for light oils was proposed. 3 mm pipe. They used both, a steel and an acrylic pipe to investigate the influence of the wetting properties of the fluids to different wall materials. Simmons and Azzopardi (2001) measured drop size distributions for oil-water systems in a 63 mm pipe. They compared their results to the flow map proposed by Trallero et al.

2003) investigated flow patterns and their transitions of oil-water systems in a 40 mm inner diameter pipe. Similar to Angeli and Hewitt (2000), they used both a stainless steel and a perspex pipe. Additionally, they developed semi-theoretical transition criteria to predict the transition lines. Bannwart et al. 4 mm pipes. Sotgia and Tartarini (2004) gave an overview on the state-of-the-art and recent developments on pressure drop reductions and flow regimes of oil-water flows in horizontal pipes.

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17eme probleme de Hilbert by Ribenboim P.

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