TY - JOUR
T1 - Hydrodynamics and mass transfer in liquid-liquid non-circular microchannels
T2 - Comparison of two aspect ratios and three junction structures
AU - Sattari, Mehdi
AU - Nasr Esfahany, Mohsen
AU - Wu, Zan
AU - Sundén, Bengt
PY - 2017/8/15
Y1 - 2017/8/15
N2 - Hydrodynamics and mass transfer in liquid-liquid slug flow inside a square microchannel (MC-1, aspect ratio 1) and a rectangular microchannel (MC-2, aspect ratio 2) with identical hydraulic diameter (400 µm) were investigated experimentally. The results showed that the overall volumetric mass transfer coefficient (KLa) in MC-2 was 16.2% lower than that in MC-1 due to enlargement of the dispersed phase slugs in MC-2, leading to development of stagnant zones within plugs and reduction of wall film renewal. Three different junction configurations (JC) were studied. KLa was enhanced by up to 34.8% using JC-1, compared to JC-2 or JC-3 due to greater movement of the biphasic interface, resulting in higher mixing within slugs using JC-1. The junction arrangement influenced not only the mass transfer during the slug-formation stage, but also the slug-flowing stage due to effects on the vortex patterns along the microchannel.
AB - Hydrodynamics and mass transfer in liquid-liquid slug flow inside a square microchannel (MC-1, aspect ratio 1) and a rectangular microchannel (MC-2, aspect ratio 2) with identical hydraulic diameter (400 µm) were investigated experimentally. The results showed that the overall volumetric mass transfer coefficient (KLa) in MC-2 was 16.2% lower than that in MC-1 due to enlargement of the dispersed phase slugs in MC-2, leading to development of stagnant zones within plugs and reduction of wall film renewal. Three different junction configurations (JC) were studied. KLa was enhanced by up to 34.8% using JC-1, compared to JC-2 or JC-3 due to greater movement of the biphasic interface, resulting in higher mixing within slugs using JC-1. The junction arrangement influenced not only the mass transfer during the slug-formation stage, but also the slug-flowing stage due to effects on the vortex patterns along the microchannel.
KW - Aspect ratio
KW - Interfacial area
KW - Mass transfer
KW - Microchannel
KW - Mixing junction
UR - http://www.scopus.com/inward/record.url?scp=85017478729&partnerID=8YFLogxK
U2 - 10.1016/j.cej.2017.04.028
DO - 10.1016/j.cej.2017.04.028
M3 - Article
AN - SCOPUS:85017478729
SN - 1385-8947
VL - 322
SP - 328
EP - 338
JO - Chemical Engineering Journal
JF - Chemical Engineering Journal
ER -