microchannel, Taylor slug flow, computational fluid dynamics, volume of fluid
Gas-liquid two-phase flow in a microfluidic T-junction with nearly square microchannels of 113 μm hydraulic diameter was investigated experimentally and numerically. Air and water superficial velocities were 0.018–0.791 m/s and 0.042–0.757 m/s, respectively. Three-dimensional modeling was performed with computational fluid dynamics (CFD) software FLUENT and the volume-of-fluid (VOF) model. Slug flow (snapping/breaking/jetting) and stratified flow were observed experimentally. Numerically predicted void fraction followed a linear relationship with the homogeneous void fraction, while experimental values depended on the superficial velocity ratio UG/UL. Higher experimental velocity slip caused by gas inlet pressure build-up and oscillation caused deviation from numerical predictions. Velocity slip was found to depend on the cross-sectional area coverage of the gas slug, the formation of a liquid film and the presence of liquid at the channel corners. Numerical modeling was found to require improvement to treat the contact angle and contact line slip, and could benefit from the use of a dynamic boundary condition to simulate the compressible gas phase inlet reservoir.
Faculty of Applied Science & Technology
School of Chemical and Environmental Sciences
International Journal of Multiphase Flow
Peer Reviewed/Refereed Publication
© 2009 Elsevier Ltd. All rights reserved.
Original Publication Citation
Santos, R. M., & Kawaji, M. (2010). Numerical modeling and experimental investigation of gas–liquid slug formation in a microchannel T-junction. International Journal of Multiphase Flow, 36(4), 314-323. doi:10.1016/j.ijmultiphaseflow.2009.11.009
Santos, Rafael M. and Kawaji, Masahiro, "Numerical Modeling and Experimental Investigation of Gas-Liquid Slug Formation in a Microchannel T-Junction" (2010). Faculty Publications and Scholarship. 13.