![]() The mixture critical point depends on the mixture fractions, and it is not straightforward to estimate, especially if more than two components are present. To add complication, a mixture of compounds will have entirely different critical points (pressure P c and temperature T c) than each of the pure substances that form the mixture. Evidence for the evolution of the interface, and for supercritical states, is presented and discussed. Temperature distributions are acquired using thermocouples. Planar laser induced fluorescence (PLIF) and planar elastic light scattering (PELS) imaging are applied to these jets, to image mixture fraction (via PLIF) simultaneously with the detection of the interface strength (via PELS). ![]() Vapor/liquid equilibrium calculations identifying the critical locus for mixtures of fluoroketone and nitrogen are used to define six test cases, covering the range from entirely subcritical to entirely supercritical states. A steady, laminar flow of fluoroketone enters a chamber of high pressure and temperature nitrogen, allowing direct examination of the interface as it evolves with flow time (i.e., axial position in the chamber). This paper describes laser imaging experiments on steady, rotationally symmetric, laminar jets aimed at observation of the interface between an injected liquid and the surrounding gas under subcritical, transcritical, and supercritical conditions.
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