Simultaneous Measurement of Temperature and Velocity by LIF and Its Application to The Vortex Rings in The Inversion Layer

This experiment utilizes the fluorescent dyes (Rhodamine B、Rhodamine 110) that shine with their intensity proportional to its temperature. Combining the use of laser-induced fluorescence (LIF) and particle image velocimetry (PIV), we are able to measure the fluid flow without disturbing the flow. On the dissertation, we use the technique to measure the transient phenomena of a vortex ring moving in a thermally inversion ambient.he principle of the LIF technology, experimental set-up, and calibration are detailed. We measured vortex rings with a fixed momentum in both thermally homogeneous and thermally inverse ambients for comparison. Use this technology in combining with PIV for the present topic of interest is proven feasible, in additional, Numerical analysis using commercial software Comsol Multiphysics is also performed.