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

摘要： 利用平面激光诱导荧光测试技术对多孔错流喷射混合器内液体混合过程进行了研究，考察了操作条件（射流速度比r、混合流股Reynolds数Re_M）和混合器的结构参数（射流小孔直径d、孔径管径比d/D、射流小孔个数n）对射流轨迹线的影响。结果表明，混合流股Reynolds数对射流轨迹线影响较小，射流速度比和混合器的结构参数是影响射流轨迹线的主要因素。建立了射流轨迹线的数学模型，并利用实验结果回归了模型参数。模型预测的液体混合过程射流轨迹线与实验结果基本吻合。

关键词: 混合, 喷射混合器, 射流轨迹线, 激光诱导荧光, 模型