Experimental study of micromixing in curved tube reactors by the reactive tracer method

Antoni Rożeń , Janusz Kopytowski

Abstract

The effect of basic process conditions and the initial distribution of mixed liquids on mixing on the molecular scale was studied experimentally for helical and twisted bends reactors. The selectivity of two competitive-parallel reactions, acid-base neutralization and alkaline ester hydrolysis, carried out in aqueous solutions between initially unmixed reactants, was used to quantify micromixing in steady-state, isothermal and laminar flow. Faster micromixing is achieved in the twisted bends mixer than in the helical mixer due to the periodic reorientation of Dean vortices, present in curved conduits. The difference in micromixing performance of the two reactors decreases for high Reynolds numbers (Re > 1000) when ester hydrolysis is no longer controlled by mixing. Micromixing for lower Reynolds numbers can be improved by changing the ratio of volumetric flows of the reactant solutions and by using a distribution head, which at the reactor entrance creates the contact surface between mixed liquids perpendicular to the curvature plane of the first pipe bend. When micromixing in the reactor becomes so slow that the final selectivity approaches its maximum value, changing the ester to a slower reacting one helps to adjust the sensitivity of the test reaction system to the deteriorating mixing conditions.

Author Antoni Rożeń (FCPE / DCRED)
Antoni Rożeń,,
- Department of Chemical Reactor Engineering and Dynamics
, Janusz Kopytowski (FCPE / DCRED)
Janusz Kopytowski,,
- Department of Chemical Reactor Engineering and Dynamics
Journal seriesChemical Engineering Research & Design, [Chemical Engineering Research and Design], ISSN 0263-8762, e-ISSN 1744-3563
Issue year2020
Vol160
Pages335-350
Publication size in sheets0.75
Keywords in Englishchaotic advection, helical pipe, twisted bends, laminar flow, parallel reactions
ASJC Classification1500 General Chemical Engineering; 1600 General Chemistry
DOIDOI:10.1016/j.cherd.2020.04.042
URL https://www.sciencedirect.com/science/article/abs/pii/S0263876220301994
Languageen angielski
File
Rożeń A., Kopytowski J. - Experimental study of....pdf 3.59 MB
Score (nominal)140
Score sourcejournalList
ScoreMinisterial score = 140.0, 11-08-2020, ArticleFromJournal
Publication indicators Scopus Citations = 0; WoS Citations = 0; Scopus SNIP (Source Normalised Impact per Paper): 2018 = 1.296; WoS Impact Factor: 2018 = 3.073 (2) - 2018=3.23 (5)
Citation count*
Cite
Share Share

Get link to the record


* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.
Back
Confirmation
Are you sure?