Date of download: 11/7/2017 Copyright © ASME. All rights reserved. From: Stability of Two-Immiscible-Fluid Systems: A Review of Canonical Plane Parallel Flows J. Fluids Eng. 2016;138(10):100803-100803-17. doi:10.1115/1.4033969 Figure Legend: Flow regimes and interfacial structure. ○: Laminar– turbulent transition in water phase, •: laminar–turbulent transition in oil phase, —: indicates transition in interfacial wave structure. The superficial Reynolds number for each phase is defined based on hydraulic diameter of the conduit, superficial velocity of that phase defined as the volumetric flow rate of thephase divided by the conduit cross-sectional area and kinematic viscosity of that phase. (Reprinted with the permission from Charles and Lilleleht [68]. Copyright 1965 of AIP Publishing.)