Transparent, immiscible, surrogate liquids with matchable refractive indexes: Increased range of density and viscosity ratios

By replacing the “heavy” siliconeoil used in theoil phase of Saksena, Christensen, and Pearlstein [ “Surrogate immiscibleliquid pairs withrefractive indexes matchable over a wide range of density andviscosity ratios, ” Phys. Fluids27, 087103 (2015)] by one with a twentyfold higherviscosity, and replacing the “light” siliconeoil in that work by one with aviscosity fivefold lower and a density about 10% lower, we have greatly extended the range ofviscosity ratio accessible by index-matching the adjustable-compositionoil phase to an adjustable-composition 1,2-propanediol + CsBr + H2O aqueous phase and have also extended the range of accessible density ratios. The new system of index-matchable surrogate immiscibleliquids is capable of achieving the density andviscosity ratios forliquid/liquid systems consisting ofwater with the entire range of light or mediumcrude oils over the temperature range from 40 °F (4.44 °C) to 200 °F (93.3 °C) and can access the density andviscosity ratios forwater with some heavycrude oils over part of the same temperature range. It also provides a room-temperature, atmospheric-pressure surrogate for theliquid CO2 + H2O system at 0 °C over almost all of the pressure range of interest in sub-seabed CO2 sequestration.

Source: Physics of Fluids - December 5, 2016 Category: Physics Authors: J érémy Cadillon, Rajat Saksena and Arne J. Pearlstein Source Type: research