Numerical simulation of fluid mixing time in liquid impinging streams reactor

On the basis of theoretical calculation, the mixing process under continuous operation in liquid impinging streams reactor (LISR) was simulated by CFD and the change of mixing time was calculated and verified numerically. With increasing effective specific power, mixing time decreased rapidly at first and then tended to be smooth and steady. The local mixing time in one stroke of impinging mixing was less than 0.25 s, which fully agreed with the order of magnitude figured out by empirical model and theoretical model. It was demonstrated that using the numerical method to analyze local mixing time is feasible. It could also make up for the deficiency of experimental research. To further study macromixing time and micromixing time numerically, it was found that macromixing time was one order of magnitude greater than micromixing time, but both changes were fundamentally consistent and were in a linkage state of equilibrium which was in accordance with our previous theoretical analysis. These conclusions could be used as the mechanism methods and quantitative reference for follow-up study of mixing enhancement mechanism of LISR.