Analysis of micro vortex metallization and introduction of evaluation factor in mixing process

HE Jun-guo, WEI Xi-zhu, JIANG Tao, ZHANG Jie



Author NameAffiliation

HE Jun-guo State Key Laboratory of Urban Water Resources and Environments, School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China,junguohe@263.net 

WEI Xi-zhu State Key Laboratory of Urban Water Resources and Environments, School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China,junguohe@263.net 

JIANG Tao State Key Laboratory of Urban Water Resources and Environments, School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China,junguohe@263.net 

ZHANG Jie State Key Laboratory of Urban Water Resources and Environments, School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China,junguohe@263.net 



Abstract:

To improve the mixing efficiency in water purification or wastewater treatment process and understand the mechanism of mass transfer, and a suitable evaluation factor is introduced to evaluate the efficiency of mixing process. The diffusion mass transfer under turbulent condition is investigated based on dynamic and mathematical analysis. The results indicate that submicroscopic diffusion is the rate-limiting step in mass transfer, and the inertia effect of micro vortex causes the phase mixing. An excellent efficiency can be obtained by controlling the scale of micro vortex within millimeter. Furthermore, a new indicator named mixing factor ª§(Iª­H)ª§ is proposed to evaluate the efficiency of mixing processes, which is more feasible than conventional evaluation methods, because of its connection of mixing extent with energy consumption.

Key words:  mixing process  micro vortex  mixing efficiency  mass transfer  evaluating indicator

DOI£º10.11916/j.issn.1005-9113.2009.02.007

Clc Number:X703.1

Fund: