Micromixing effects in a couette flow reactor
Journal
Chemical Engineering Science
Journal Volume
54
Journal Issue
13-14
Pages
2883-2888
Date Issued
1999
Author(s)
Liu C.I.
Abstract
This work quantitatively measures the micromixing efficiency in a Couette flow reactor on the basis of a unique parallel competing reaction scheme proposed by Villermaux and co-workers. According to those results, hydrodynamic instability markedly affects the segregation index. In laminar Couette flow (LCF) regime, increasing the rotational speed only slightly increases the micromixing efficiency. On the other hand, initiating the Taylor vortex motion significantly enhances the micromixing efficiency. In addition, the mixing times are estimated on the basis of an incorporation model. In LCF regime, the estimated micromixing time is unreasonably high. At the subsequently hydrodynamic transitions, t(m) substantially decreases and ultimately reaches a low level of 10-3-10-4 s in the turbulent vortex flow regime.This work quantitatively measures the micromixing efficiency in a Couette flow reactor on the basis of a unique parallel competing reaction scheme proposed by Villermaux and co-workers. According to those results, hydrodynamic instability markedly affects the segregation index. In laminar Couette flow (LCF) regime, increasing the rotational speed only slightly increases the micromixing efficiency. On the other hand, initiating the Taylor vortex motion significantly enhances the micromixing efficiency. In addition, the mixing times are estimated on the basis of an incorporation model. In LCF regime, the estimated micromixing time is unreasonably high. At the subsequently hydrodynamic transitions, tm substantially decreases and ultimately reaches a low level of 10-3-10-4 s in the turbulent vortex flow regime.
Subjects
Couette flow
Hydrodynamic instability
Measurement
Micromixing
Mixing time
Segregation index
SDGs
Type
journal article