Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
621868 | Chemical Engineering Research and Design | 2012 | 10 Pages |
A comprehensive study on the liquid mixing with/without instantaneous reactions was conducted using planar laser induced fluorescence (PLIF) technique, where a novel reactive PLIF technique was adopted to quantitatively visualize the dynamic variation of the concentration of fluorescence dye due to signal quenching by a Fenton reaction. The factors (e.g., tracer injection direction, tracer injection position, impeller speed) influencing the reactive and non-reactive mixing processes were investigated, and the mixing performances were characterized by non-reactive mixing times (τ95 and τ99), and reactive mixing time (θ99), respectively. The experimental results from the 2-D measurements of liquid mixing behavior emphasized the significance of the understanding on the spatio-temporal mixing patterns: not only did the tracer injection position affect the mixing performances in the stirred tank, but also the sampling position to monitor the mixing status would lead to a large difference in evaluating the mixing performance. For the stirred tank with fast reactions, the reactive mixing performance had a strong interplay with the non-reactive mixing.
► A novel approach to visualize reactive mixing process was proposed by PLIF technique. ► The interplay between mixing and instantaneous reaction was revealed in stirred tanks. ► Effects of tracer injection, sampling position and operating conditions on mixing performance were emphasized.