关键词: 混合, 喷射混合器, 射流轨迹线, 激光诱导荧光, 模型

Abstract: Liquid mixing process in a multi-orifice-impinging transverse (MOIT) jet mixer was studied by using planar laser induced fluorescence (PLIF) technique quantitatively. The effects of operation conditions (jet-to-pipe velocity ratio, r, and Reynolds number of the mixing fluids, Re_M) and configuration parameters (orifice diameter, d, orifice-to-pipe diameter ratio, d/D, and number of the orifices embedded symmetrically on the wall of the pipe, n) on the macro-mixing performance, in particular, in terms of jet trajectories, were investigated. Jet-to-pipe velocity ratio and configuration parameters of the mixer are the main factors affecting the mixing process, whereas Re_M had little effect on the jet trajectories. A mathematical model, with x as spanwise coordinate, y as streamwise coordinate, was proposed to predict the jet trajectories of the liquid mixing process in the MOIT jet mixer. The predicted jet trajectories agreed well with those from PLIF experiments.

Key words: mixing, jet mixer, jet trajectory, planar laser induced fluorescence, model