Cfd Analysis Of Flow Patterns And Mixing Efficiency In Micro-Impinging Stream Reactor

In recent years, there have been more and more interests on micro chemical unit equipments. By contrast, the two coaxial jets in a confined impinging jet reactor (CIJR) were used widely, generating a localized region of highly intense turbulent-energy dissipation and significant micro-mixing efficiency. To combine the advantage of the micro-reactor and the CIJ reactor, a micro-impinging stream reactor (MISR) was developed.In this work, MISR was characterized by computational fluid dynamics method. Firstly, the hydrodynamic behaviors of reactor were investigated, and the most appropriate condition for forming impinging stream was found. And the macro-mixing efficiency was simulated by CFD method. Then the MISR’s micro-mixing efficiency was characterized by the Villermaux/Dushman reaction, and the results of CFD method and experiments agreed well with each other. The effects of outlet configuration, outlet length and inlet diameter with the same reaction chamber on micro-mixing efficiency were studied as well. The numerical results demonstrated that that the inlet Reynolds number has to be3000for forming completely impinging stream in MISR-E-0.6-3.6. Micro-mixing efficiency was improved by increasing inlet diameter. Outlet configuration also had a great influence on the segregation. But the outlet length had little effects on the micro-mixing efficiency. Chemical process in the reactor is controlled by the micro-mixing efficiency directly.