(500e) Numerical Simulation of Dripping and Jetting in Supercritical Fluids / Liquid Micro Coflows Conference: AIChE Annual MeetingYear: 2013Proceeding: 2013 AIChE Annual MeetingGroup: Engineering Sciences and FundamentalsSession: Nanoparticle, Nanotechnology and Interfacial Phenomena Using Compressible Or Supercritical Fluids Time: Wednesday, November 6, 2013 - 2:10pm-2:35pm Authors: Erriguible, A., I2M, CNRS, University of Bordeaux Marre, S., Institute of Condensed Matter Chemistry of Bordeaux Aymonier, C., CNRS, Univ. Bordeaux, Bordeaux INP, ICMCB Subra-Paternault, P., Laboratoire TREFLE (Transfert, Ecoulements Fluides Energetiques) Guillaument, R., I2M - TREFLE - IPB - University of Bordeaux In this work, a two dimensional simulation of segmented micro coflows of CO2 and water in microcapillaries (20 < T (°C) < 50 and 8 < p (MPa) < 16.5) was carried out using a combination of the one-fluid model and the volume of fluid (VOF) method to describe the two-phase flow and a penalty method to account for the wetting property of the capillary walls. The computational work was validated by comparing numerical and experimental results in both the dripping and jetting regimes (Figure 1). The agreement of the calculated pressure difference across the droplet or jet interface with the Laplace-Young’s law was assessed as supplementary criteria. The effects of CO2 / Water interfacial tension (5 < s (mN.m-1) < 35) and wall wettability (contact angle CO2 / wall varying from 0 to 180°) on the segmented water – supercritical CO2 microflows were specially described. It was shown that switching the wall surface from hydrophilic to hydrophobic by tuning the contact angle allows for changing the droplet curvature so that the continuous water phase eventually undergoes a phase inversion resulting in water droplets/slugs formation in a continuous CO2 phase.