English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/240419
Share/Impact:
Statistics
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL | DATACITE
Exportar a otros formatos:

Title

Optimal fluid stretching for mixing-limited reactions in rough channel flows

AuthorsYoon, Seon; Dentz, Marco ; Kang, Peter K.
KeywordsPorous media
Mixing and dispersion
Laminar reacting flows
Issue Date14-Apr-2021
PublisherCambridge University Press
CitationJournal of Fluid Mechanics 916: A45 (2021)
AbstractWe study the reactive displacement of two miscible fluids in channel flows and establish a quantitative link between fluid stretching and chemical reactivity. At the mixing interface, the two fluids react according to the instantaneous irreversible bimolecular reaction A+B→C . We simulate the advection–diffusion–reaction problem using a random walk based reactive particle method that is free of numerical dispersion. The relative contributions of stretching and diffusion to mixing-limited reaction is controlled by changing the Péclet number, and the channel roughness is also systematically varied. We observe optimal ranges of fluid stretching that maximize reactivity, which are captured by a Lagrangian stretching measure based on an effective time period that honours the stretching history. We show that the optimality originates from the competition between the enhanced mixing by fluid stretching and the mass depletion of the reactants. We analytically derive the spatial distribution of reaction products using a lamellar formulation and successfully predict the optimal ranges of fluid stretching, which are consistent across different levels of channel roughness. These findings provide a mechanistic understanding of how the interplay between fluid stretching, diffusion and channel roughness controls mixing-limited reactions in rough channel flows, and show how reaction hot spots can be predicted from the concept of optimal fluid stretching.
Publisher version (URL)10.1017/jfm.2021.208
URIhttp://hdl.handle.net/10261/240419
DOI10.1017/jfm.2021.208
Appears in Collections:(IDAEA) Artículos
Files in This Item:
File Description SizeFormat 
optimal-fluid-stretching-for-mixing-limited-reactions-in-rough-channel-flows.pdfArtículo principal2,76 MBAdobe PDFThumbnail
View/Open
Show full item record
Review this work
 


WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.