Effect of surfactant addition and viscosity of the continuous phase on flow fields and kinetics of drop formation in a flow-focusing microfluidic device

Effects of gas concentration on hydrodynamics of gas absorption in a microchannel

“…If Q L and Q G are constant, when φ decreases, ε increases and the liquid velocity u L, φ increases. The existence of surfactant makes Marangoni effect more obvious 26 . In the flow direction, there is a liquid slug in front of and behind every bubble, and the mass transfer time of the liquid slug in front is always longer than that of the liquid slug behind.…”

“…The existence of surfactant makes Marangoni effect more obvious. 26 In the flow direction, there is a liquid slug in front of and behind every bubble, and the mass transfer time of the liquid slug in front is always longer than that of the liquid slug behind. This may cause the uneven distribution of surfactant in the liquid film around the bubble, which leads to the relative velocity difference at the gas-liquid interface.…”

Surfactant-laden droplet size prediction in a flow-focusing microchannel: a data-driven approach

“…squeezing, jetting, tip-streaming) have been reported and have been extensively studied both experimentally and numerically in previous works 5,13,18,48,53 . In addition, Kiratzis et al 14 showed the importance of the phase viscosity ratio on the drop formation process. This work aims to unravel the unexplored capabilities of data-driven-models for droplet microflu- idics.…”

“…[10][11][12] Roumpea et al 13 used a two-colourParticle Image Velocimetry setup to study the effect of surfactants during droplet formation in a flow-focusing microchannel. Recently, Kiratzis et al 14 studied the effect of surfactant addition in the aqueous dispersed phase during droplet generation using Ghost Particle Velocimetry (GPV). Such studies enable better understanding of surfactant transfer and adsorption.…”

Anisotropic microfluidics and flow monitoring with a microchannel towards soft-matter sensing

“…Microfluidics, 1 which is commonly used in various forms in biology, 2 chemistry, 3 physics, 4 and other subjects, has played a dominating role in bioanalysis systems, 5,6 chemical analysis and synthesis, the formation of droplets and bubbles, [7][8][9][10] flow manipulation, and other areas of development. Anisotropic microfluids [11][12][13] and microparticles 14,15 have attracted extensive scientific interest in recent years, since the inherent anisotropy of these molecules provides unique flow field responsiveness, which can visually reflect flow rates.…”