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Publisher DOI: 10.1007/s41981-021-00178-x
Title: CFD analysis of asymmetric mixing at different inlet configurations of a split-and-recombine micro mixer
Language: English
Authors: Frey, Torben 
Schlütemann, Rieke 
Schwarz, Sebastian 
Biessey, Philip 
Hoffmann, Marko 
Grünewald, Marcus 
Schlüter, Michael 
Issue Date: 1-Jul-2021
Publisher: Springer International Publishing
Source: Journal of Flow Chemistry 11 (3): 599-609 (2021)
Abstract (english): 
In the scope of the ENPRO II initiative (Energy Efficiency and Process Intensification for the Chemical Industry), a major challenge of process intensification of polymer synthesis in continuous systems is fouling. Pre-mixing is a key aspect to prevent fouling and is achieved through milli and micro structured devices (Bayer et al. 1). While equal volume flow ratios are well investigated in milli and micro systems, asymmetric mixing tasks have received less attention. This paper investigates the dependency of mixing phenomena on different flow rate ratios and modified inlet geometries. A split-and-recombine (SAR) mixer is modified by means of an injection capillary to facilitate the asymmetric mixing task. Asymmetric volume flows of ratios between 1:15 and 1:60 are investigated; the velocity ratios range from 0.5 to 2. The setup is simulated with the Computational Fluid Dynamics (CFD) tool ANSYS®; Fluent. The species equation is solved directly without the use of micro mixing models. The simulation is validated by means of a concentration field in a mixing Tee using Laser-Induced Fluorescence (LIF) with a Confocal Laser Scanning Microscope (CLSM). The three dimensional flow structures and the mixing quality are analyzed as a measure for micro mixing. The calculated concentration fields show good agreement with the experimental results and reveal the secondary flow structures and chaotic advection within the channel. The injection of the small feed stream is found to be very efficient when drawn into the secondary structures, increasing the potential of diffusive mixing. CFD simulations help to understand and locate such structures and improve the mixing performance.
DOI: 10.15480/882.3902
ISSN: 2063-0212
Journal: Journal of flow chemistry 
Institute: Mehrphasenströmungen V-5 
Document Type: Article
Project: Projekt DEAL 
KoPPonA2.0; Entwicklung von modularen, intelligenten, gegen Belagsbildung resistenten Reaktoren; Teilvorhaben CFD-Modellierung von Belagsbildungsvorgängen 
Funded by: Bundesministerium für Wirtschaft und Energie - BMWi 
More Funding information: This project is supported by the Federal Ministry for Economic Affairs and Energy on the basis of a decision by the German Bundestag.
License: CC BY 4.0 (Attribution) CC BY 4.0 (Attribution)
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