Slip ratio in dispersed viscous oil-water pipe flow |
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Authors: | Iara H Rodriguez Henrique KB YamagutiMarcelo S de Castro Marco J Da SilvaOscar MH Rodriguez |
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Institution: | a Department of Mechanical Engineering, Engineering School of São Carlos, University of São Paulo (USP), Av. Trabalhador São Carlense, 400, 13566-970 São Carlos, SP, Brazil b Forschungszentrum Dresden-Rossendorf e. V., Institute of Safety Research, PO Box 510119, 01314 Dresden, Germany |
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Abstract: | In this article, dispersed flow of viscous oil and water is investigated. The experimental work was performed in a 26.2-mm-i.d. 12-m-long horizontal glass pipe using water and oil (viscosity of 100 mPa s and density of 860 kg/m3) as test fluids. High-speed video recording and a new wire-mesh sensor based on capacitance (permittivity) measurements were used to characterize the flow. Furthermore, holdup data were obtained using quick-closing-valves technique (QCV). An interesting finding was the oil-water slip ratio greater than one for dispersed flow at high Reynolds number. Chordal phase fraction distribution diagrams and images of the holdup distribution over the pipe cross-section obtained via wire-mesh sensor indicated a significant amount of water near to the pipe wall for the three different dispersed flow patterns identified in this study: oil-in-water homogeneous dispersion (o/w H), oil-in-water non-homogeneous dispersion (o/w NH) and Dual continuous (Do/w & Dw/o). The phase slip might be explained by the existence of a water film surrounding the homogeneous mixture of oil-in-water in a hidrofilic-oilfobic pipe. |
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Keywords: | Liquid-liquid flow Oil-water flow Viscous oil Dispersed flow Slip ratio Wire-mesh sensor |
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