A comparative analysis of micro-mixing process in a confined impinging jet reactor with/without applying ultrasound

Luming Chen, Hongwei Zeng, Yanqin Guo, Xiaogang Yang, Bingbing Chen

Research output: Journal PublicationArticlepeer-review

Abstract

Studies on the influences of ultrasound-induced cavitation on the micro-mixing process in a confined impinging jet reactor (CIJR) are still lacking. In the present study, experimental and numerical approaches are employed to investigate the effects of ultrasound intensification on the mixing processes in a CIJR. The numerical results are experimentally validated. The model is also coupled with chemical reactions for the first time. It is found that local eddies generated by the collapse of acoustic microbubbles and “turbulence”-like acoustic streaming can significantly reduce the micro-mixing time. In all cases, the micro-mixing efficiency is found to increase with an increase in the power of ultrasound. A reduction of 15–24% in micro-mixing time can be achieved at the inlet velocity of 0.2m/s when the power of ultrasound increases from 122.5W to 175W. It is also found that the effect of ultrasound intensification on the meso-mixing process is larger than that on the micro-mixing process in the vicinity of transducer head. The ratio of micro-mixing time to meso-mixing time in the case of Pultra=175W can be 88% larger than that in the case of Pultra=0W in the front of the transducer head at Rein=5000.

Original languageEnglish
Article number108991
JournalChemical Engineering and Processing: Process Intensification
Volume177
DOIs
Publication statusPublished - Jul 2022

Keywords

  • Computational fluid dynamics (CFD)
  • Confined impinging jet reactor
  • Micro-mixing process
  • Ultrasound
  • Vorticity

ASJC Scopus subject areas

  • Chemistry (all)
  • Chemical Engineering (all)
  • Energy Engineering and Power Technology
  • Industrial and Manufacturing Engineering

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