| Abstrakt: |
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. 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). 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. 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). Temperature distributions are acquired using thermocouples. Evidence for the evolution of the interface, and for supercritical states, is presented and discussed. [ABSTRACT FROM AUTHOR] |
