%0 Journal Article %A Ibarra, Roberto %A Markides, Christos N. %A Matar, Omar K. %D 2014 %I Begell House %K horizontal liquid-liquid flow, inclined liquid-liquid flow, flow pattern map, flow pattern classification %N 3 %P 171-198 %R 10.1615/MultScienTechn.v26.i3.10 %T A REVIEW OF LIQUID-LIQUID FLOW PATTERNS IN HORIZONTAL AND SLIGHTLY INCLINED PIPES %U https://www.dl.begellhouse.com/journals/5af8c23d50e0a883,607151407343fa08,7543f6070fa31520.html %V 26 %X This paper presents a review of the co-current flow of two immiscible liquids in horizontal and slightly inclined pipes. Liquid-liquid flows are present in a wide variety of industrial processes, such as chemicals, pharmaceuticals, and food processing. However, this phenomenon is mainly studied in the oil industry, especially in the analysis of oil-water mixtures encountered in long transportation pipelines from the wellhead to the processing facility. The hydrodynamic behavior of liquid-liquid flows is more complex than that of gas-liquid flows because of density ratio, viscosity ratio, interfacial forces, and pipe wettability. This means that a significant number of different flow patterns can be obtained from different fluid properties and pipe characteristics. Furthermore, the flow pattern classification of liquid-liquid flows is arbitrary and several researchers use their own classification, complicating comparison and analysis of flow pattern maps. In this paper, a unified flow pattern classification for liquid-liquid flow is proposed. This classification enables the direct comparison of flow pattern maps for further analysis. %8 2015-05-05