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Coflowing setup developed for this study. (a) Typical observation of the flow with the insertion of a small diameter fused silica tubing in a larger one. and are the inner diameters of the large and the small tubing, respectively. (b) General setup including two high pressure pumps, a T connector for the insertion of the small silica tubing in the larger one, a temperature-controlled area and a back pressure regulator.
Dynamic phase diagram in the ( and ) plane of the -liquid water coflowing system. The dripping regime includes spherical droplets (open circle) and slugs (open square). Jets have been observed with various shapes: large straight jet (hexagon), thin jets breaking into droplets (filled circle), wavy jet (filled square), wavy jet breaking into slugs (diamond), thin straight jet (triangle), or more complicated shapes for flows with high Re (pentagon). In this configuration, , , , and . The red dotted line corresponds to the dripping to jetting transition that should be obtained when considering a model developed for liquid-liquid microcoflows [see Ref. 5(a)].
(a) Dynamic phase diagrams in the ( and ) plane of the -liquid water coflowing system, obtained at two different pressures, all other parameters being kept constant (, , and ). (b) Turbulence observed from high flow rate , in liquid water , for , , , and , i.e., for the flow: .
Physical properties and corresponding values for the adimensional numbers (, , and Re) of and liquid water flows at for and 18 MPa, respectively. Values of were estimated from pendant drop method data (see Ref. 15).
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