Investigation on mass transfer in the synthesis of MnO2 in an ultrasound enhanced impinging jet reactor

This study experimentally investigated the mass transfer process involved in nanoparticle synthesis in an ultrasound-enhanced confined impinging jet reactor. The effects of micro-mixing performance and nucleation rate on the mass transfer rate were investigated in detail. It was found that ultrasound application effectively reduced the average particle size of the nanoparticles and narrow the particle size distribution range. Ultrasonic cavitation effects can markedly increase the nucleation rate of nanoparticles, leading to smaller average particle sizes. The application of ultrasound can effectively reduce the particle size, which finally inhibits the mass transfer at the particle scale. However, it is found that the mass transfer performance over the reactor is enhanced by the ultrasonic cavitation effect increasing nucleation rate and micromixing efficiency.