A study of Novec 649^TM fluid jets injected into sub-, trans-, and supercritical thermodynamic conditions using planar laser induced fluorescence and elastic light scattering diagnostics

This paper describes laser imaging experiments on steady, rotationally symmetric, laminar jets aimed at observation of the interface between an injected liquid and surrounding gas under subcritical, transcritical, supercritical conditions. A flow fluoroketone enters a chamber high pressure temperature nitrogen, allowing direct examination as it evolves with time (i.e., axial position in chamber). Vapor/liquid equilibrium calculations identifying critical locus for mixtures nitrogen are used to define six test cases, covering range from entirely subcritical states. Planar induced fluorescence (PLIF) planar elastic light scattering (PELS) applied these jets, image mixture fraction (via PLIF) simultaneously detection strength PELS). Temperature distributions acquired using thermocouples. Evidence evolution interface, states, is presented discussed.