Investigating laminar mixing in high pressure microfluidic systems
Language
en
Article de revue
This item was published in
Chemical Engineering Science. 2019-09, vol. 205, p. 25-35
Elsevier
English Abstract
In this study, the hydrodynamic behavior of coflowing fluids CO2 and ethanol has been investigated in a high-pressure microfluidic reactor working at supercritical conditions, in which the two fluids are completely miscible. ...Read more >
In this study, the hydrodynamic behavior of coflowing fluids CO2 and ethanol has been investigated in a high-pressure microfluidic reactor working at supercritical conditions, in which the two fluids are completely miscible. The velocity field has been measured by Micro Particle Image Velocimetry (PIV) for different temperatures between 20 and 50 °C at a fixed pressure of 100 bar. Meanwhile, we have developed a model to investigate numerically the mixing. By comparing the experimental results to a three-dimensional numerical simulation, the mixing model has been validated for the laminar coflow in the micromixer. In order to understand the mixing condition effects, several parameters have been investigated, namely: the Reynolds number, the temperature and the CO2/ethanol ratio. A mixing time constant is defined by using the segregation intensity curve and later used to characterize the mixing quality. The characteristic mixing time has been related to the laminar energy dissipation rate ∊, similarly to the stretching efficiency model in previous studies. The mixing quality is eventually analyzed in term of segregation index and mixing time.Read less <
English Keywords
Supercritical antisolvent process (SAS)
Micro particle image velocimetry (μPIV)
High pressure microfluidic mixing
Computational fluid dynamics (CFD)
Mixing time constant
ANR Project
Synthèse de nanocristaux organiques fluorescents en milieu fluide supercritique: une approche numérique et expérimentale complémentaire - ANR-17-CE07-0029
Origin
Hal imported