Samuel Marre
CNRS Researcher
Supercritical Fluids Group (group VII)
Institut de Chimie de la Matière Condensée de Bordeaux
87 Avenue du docteur Albert Schweitzer
33608 PESSAC Cedex

Phone: +0033 6 79 87 88 25

Research interests
  • Supercritical Microfluidics ("Microfluidique Supercritique"): High pressure / High temperature microsystems for applications involving Supercritical Fluids
  • Geological Labs on Chip / CO2 geological storage
  • Biogeolocial labs on chip for investigating CO2 bioconversion in geological media
  • Multifunctional micro and nanomaterials synthesis and processing
  • Chemical Engineering
  • Chemistry in Supercritical Fluids
  • Photochemistry processes
  • Thermo-Hydrodynamics effects

Research news

Investigating Laminar mixing in High pressure microfluidic systems


Chem. Eng. Sci., 2019, 205, 25-35. Link

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.

Chem. eng. Sci. 2019

Inertia-driven jetting regime in microfluidic coflows  

PRF, 2018, 3, 092201Link

Microfluidics have been used extensively for the study of flows of immiscible fluids, with
a specific focus on the effects of interfacial forces on flow behavior. In comparison, inertiadriven
flow of confined coflowing fluids has received scant attention at the microscale,
despite the fact that the effects of microscale confinement are expected to influence
inertia-driven flow behavior as observed in free jets. Herein, we report three distinct
modes for breakup of coflowing, confined, microscale jets: the conventional Rayleigh
mode and two additional inertia-driven modes occurring at higher Reynolds number flows,
namely, a sinuous wave breakup and an atomizationlike mode. Each of the three modes is
differentiated by a characteristic droplet size, size distribution, and dependence of the jet
length as a function of the external fluid velocity (vext ). A unified phase diagram is proposed
to categorize the jet breakup mechanisms and their transitions using, as a scale-up factor,
the ratio of the jet inertial forces to the sum of the viscous and interfacial forces for both the
inner and outer fluids. These results provide fundamental insights into the flow behavior of
microscale-confined coflowing jets.

Collaborations / contacts

Dr. Timothy Noël, TU/Eindhoven, The Netherlands
Dr. Karyn Rogers, Renssaeler Polytechnic Institute, Troy, NY, USA.
Dr. Simon Kuhn, KU Leuven, Belgium
Dr. Yves Garrabos, Supercritical fluid group at ICMCB-CNRS, Bordeaux, France.
Dr. Virginie Nazabal, Equipe verres et céramiques, ISCR, Rennes, France.
Pr. Ryan L. Hartman, New York University, NY, USA.
Pr. Mike T. Timko, Worcester Polytechnic Institute, Worcester, MA, USA.
Dr. Mathieu Pucheault, Institut des Sciences Moléculaires (ISM), Bordeaux, France.