Numerical Investigation and Estimating Correlation of Micromixing Performance of Coaxial Mixers

Research output: Contribution to journalArticle

Abstract

In view of the significance, complexity, and difficulty of micromixing in viscous system, coaxial mixers with wide adaptability to viscosity are first combined with micromixing. The effects of feeding position, rotation mode, and impeller type on the micromixing performance of coaxial mixers are investigated numerically with the standard engulfment model and eddy dissipation concept model, and a dimensionless estimating correlation of segregation index Xs is established based on the Buckingham πtheorem. The results show that feeding near the discharge zone of the impeller favors the micromixing and Rushton turbine impeller (RT) is better qualified as the impeller near feeding point compared to six-straight-blade turbine impeller (SBT) and six-pitched (45°)-blade turbine impeller (PBT). At the same specific power consumption, the coaxial mixer has better micromixing performance with PBT + RT as inner impeller than with SBT + RT, and the difference of segregation index resulting from the rotation mode is small. Moreover, the proposed correlation is validated to be suitable for qualitative evaluation of micromixing performance of coaxial mixer consisting of inner impeller combining PBT and RT and outer anchor.

Details

Authors
Organisations
External organisations
  • Zhejiang University
  • Harbin Boiler Company Limited
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Control Engineering
Original languageEnglish
Pages (from-to)22376-22388
Number of pages13
JournalIndustrial and Engineering Chemistry Research
Volume58
Issue number49
Publication statusPublished - 2019 Dec 11
Publication categoryResearch
Peer-reviewedYes