Enhancement of chaotic mixing performance in laminar flow with reciprocating and rotating coupled agitator

Fan, Mingyang; Xu, Jianxin; Sun, Hui; Wang, Shibo; Zhang, Xin; Wang, Hua; Yin, Wuliang

doi:10.1016/j.ces.2023.118988

Cited by 8 publications

(1 citation statement)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The results showed that the mixing effect of this mixer was significantly better than that of the conventional rotary mixer under appropriate parameters. Under the reciprocating motion of the impeller, a large-scale vortex is generated below the impeller, which can significantly improve the mixing effect 21 . However, the above studies lack numerical simulation to explore in-depth how reciprocating mixing can enhance mixing efficiency mechanistically.…”

Section: Introductionmentioning

confidence: 99%

Study of fluid turbulence characteristics and structural evolution in a reciprocating mixing tank

Wang,

Zhai

et al. 2024

Preprint

Self Cite

View full text Add to dashboard Cite

Reciprocating mixing is a novel mixing technique designed to enhance mixing efficiency. In this method, the mixing paddle moves back and forth along the axial direction periodically, unlike conventional mixing methods. The mixing efficiency of reciprocating stirring can be significantly enhanced compared to conventional stirring. In this thesis, the flow field characteristics and numerical simulation of the Rushton pulp reciprocating mixing tank are analyzed using the Computational Fluid Dynamics (CFD) method with VOF and UDF function control. It has been found that reciprocating mixing increases the overall speed of the fluid by about 8%, the turbulent kinetic energy by 35%-45%, and the turbulent kinetic energy dissipation rate by 10%-16% compared with conventional mixing. Reciprocating mixing significantly affects the tank basin, enhancing the axial flow of the fluid in the tank, disrupting the circulating structure of conventional agitation, and dynamically integrating the multiple flow regions of conventional agitation to improve mixing homogeneity. Additionally, the evolution process of vortex generation, development, and extinction by reciprocal stirring is quantitatively analyzed to determine the optimal size of paddle discs under different conditions. The maximum values of turbulent kinetic energy in the two stirring modes are FS-4/12D and RS-5/12D, respectively. The reason for the abrupt decrease of turbulent kinetic energy in RS-4/12D is explained as follows: The uncaused quadratic flow variance indicates that the reduction of the tail vortex size can effectively destroy the reflux zone, thus reducing the energy consumption at the tail vortex and allowing more energy to be used for fluid mixing. The results of this paper provide a theoretical basis and reference data for the engineering application of reciprocating mixing.

show abstract

Section: Introductionmentioning

confidence: 99%