Characterization of Micromixing Intensification of Impinging Jet Flow on a Spinning Disk Reactor with a Structured Surface

Abstract

Wave flows and micromixing behavior with concentric and radial grooves were investigated. Results indicate that the groove types have a significant impact on wave flows. Concentric grooves present zoning behavior in spiral waves due to accumulation and resistance to radial spreading. For radial grooves, waves form between grooves and consist of short spiral or concentric waves that can coexist, and spiral wavelets can occur at high inlet Reynolds numbers. Mixing behavior is strongly influenced by the spreading of liquid film. For high flow rates, all grooves can improve the mixing. The mixing time ranges from 0.04 to 2.19 ms, and the lowest value is attributed to the radial grooved disk. Radial grooves present a more pronounced enhancement; the mixing times are lower than the characteristic time for vorticity of turbulent eddies and are well suitable for the operation of high flow rates and enhanced mixing efficiency, which is essential for enhancing reaction yields.