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hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorZHANG, Fan
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorMARRE, Samuel
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorERRIGUIBLE, Arnaud
dc.date.issued2019-09
dc.identifier.issn1385-8947
dc.description.abstractEnThe turbulent mixing of two miscible fluids is investigated in a high pressure (HP) coflow microreactor operated at 100 bar. Ethanol and CO2 are selected as model solvents to mimic the final targeted application, i.e.: a supercritical antisolvent process at microscale (SAS). We first demonstrate experimentally that turbulent mixing can be reached in a microchannel using HP microfluidics. A computational fluid dynamic (CFD) model, performed using direct numerical simulation (DNS) down to the Kolmogorov scale has been applied for the turbulent mixing simulations. The effects of the main operating parameters on the final mixing efficiency have been studied, namely: the temperature, the fluid flowrates, the microchannel dimensions and the capillary inner and outer diameters. According to a predefined intensity of segregation, the characteristic mixing times are determined and used for determining mixing efficiency. The ratio of the total mixing time to the diffusion time depends on the ratio of the kinetic energies (the outer fluid to the inner one). The obtained micromixing times have been related to the turbulent energy dissipation rate ∊, calculated directly from the velocity fluctuations. The mixing intensification is obtained with much lower characteristic mixing times in the microreactor (one order of magnitude) than previously reported. This fundamental study is an indispensable guidance for several processes, including the SAS applications.
dc.description.sponsorshipSynthèse de nanocristaux organiques fluorescents en milieu fluide supercritique: une approche numérique et expérimentale complémentaire - ANR-17-CE07-0029
dc.language.isoen
dc.publisherElsevier
dc.subject.enMicromixing
dc.subject.enSupercritical fluid
dc.subject.enMicrofluidics
dc.subject.enMixing intensification
dc.title.enMixing intensification under turbulent conditions in a high pressure microreactor
dc.typeArticle de revue
dc.identifier.doi10.1016/j.cej.2019.122859
dc.subject.halChimie/Matériaux
bordeaux.journalChemical Engineering Journal
bordeaux.page122859 (12 p.)
bordeaux.volume382
bordeaux.peerReviewedoui
hal.identifierhal-02318108
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-02318108v1
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