Oscillatory Flow Reactor Into The Dispersion Characteristics Of The Experimental Study

In this work an experimental setup of oscillatory flow mixer (OFM) was built up and the study on the injection dispersion in OFM was carried out.In the experiment, the flow visualization technique was used with a solution of blue dye as the tracer, the injection dispersion process was monitored with a digital video camera, and the recorded image was treated with computer image processing technique to obtain the quantitative description of injection dispersion performance.It is first time that the variance sum of gray scale values of pixels was used to characterize the inhomogeneous degree of concentration fields and that the attenuation rate was used to characterize the injection dispersion performance of flow field. The work focused on the influence of oscillatory Reynolds number(Re0) and Strouhal number(St) to the injection dispersion performance of OFM, and the effect of net flow Reynolds number(Ren) was explored preliminarily.The observation of experimental phenomena and analysis of experimental data showed that the oscillatory parameters Re0 and St have a strong influence to the injection dispersion performance of OFM. At small St, the inhomogeneous degree(the variance sum) attenuates exponentially with time increasing, and the rate of attenuation increases with Re0. At large St, the dispersion is poor even at very large Re0. Ren takes effect only at large St and small Re0. As Re0籖en. the changes little with Ren.The experimental study suggests that OFM should provide high-efficient injection dispersion performance and good controllability on the time character of dispersion process, and is able to satisfy the requirement of various reaction processes to the concentration distribution in the injection area.