Dynamic interfacial tensions of dietary oils

“…This high value of the interfacial tension is probably due to the use of ultra pure oil. Actually, the higher the purity of the fluid, the higher the interfacial tension (Dopierala et al 2011). Two syringe pumps were used to inject liquids and control the flow rates of the continuous and dispersed phases in the micro-channels.…”

Section: Microfluidic Systemmentioning

confidence: 99%

New regime of droplet generation in a T-shape microfluidic junction

Tarchichi

Chollet

Manceau

2012

Microfluid Nanofluid

View full text Add to dashboard Cite

International audienceWe present an experimental study of a new regime of monodisperse micro-droplet generation that we named the balloon regime. A dispersion of oil in water in a T-junction microfluidic system was studied. Several microfluidic devices having different cross-sections of the continuous and the dispersed phases micro-channels were tested. This new regime appears only for low- dispersed phase velocity. The micro-droplet size is mainly related to the geometry of the T-junction micro-channels especially its width and depth, and independent of the continuous and dispersed phases velocities. In our experiments, the velocities of the continuous and the dispersed phases vc and vd respectively, have been varied in a wide range: vc from 0.5 to 500 mm/s, and vd from 0.01 to 30 mm/s. We show that the continuous phase only controls the micro-droplet density, while the dispersed phase linearly changes the frequency of the micro-droplet generation. Another particularity of the present regime, which differentiates it from all other known regimes, is that the micro-droplet retains its circular shape throughout its formation at the T junction, and undergoes no deformation due to the drag forces. We propose a mechanism to explain the formation of microdroplets in this new regime

show abstract

“…Similarly, for studying the eect of the cross-section of the continuous phase micro-channel, we xed the width of the dispersed phase micro-channel (w d = 20 µm) and we changed the width of the continuous phase micro-channel from one device to another (w c = 50, 100 and 200 µm). in the glass-silicon system [25]. Experiments were conducted at constant temperature (20 ± 2°C) using two syringe pumps to control the ow rates of the aqueous and oil phases in the micro-channels.…”

Section: Methodsmentioning

confidence: 99%

Oil-in-Water Droplets Generation in Dripping Regime with Channel Partial Wetting

Tarchichi¹,

Chollet²,

Manceau

2015

MNS

View full text Add to dashboard Cite

We generated silicone oil micro-droplet in deionized water with a microuidic T-junction devices made on siliconglass with dierent cross-sections (depth and width) of the continuous phase and the dispersed phase micro-channels.We experimentally show that the size of the droplet decreases when the width or the velocity of the dispersed phase micro-channel decreases but is almost insensitive to the channel depth. For describing the observed behaviour, we proposed a modied mechanism of droplet formation consisting of three stages, each with start and end precisely identied. Based on this mechanism, we developed an analytical model for obtaining the droplet diameter in dripping regime when there is partial wetting at the channel boundary. This model is in better agreement with the experiments than other analytical models from the literature, suggesting the eect of channel wetting is signicant. We also discuss the use of the capillary number in models, and suggests that the velocity would be a better metrics for comparing dierent T-junction geometry. In the experiment, the generated droplet diameter is varied between 28 µm and 196 µm.

show abstract

Dynamic interfacial tensions of dietary oils

Cited by 49 publications

References 25 publications

High-pressure emulsion formation in cylindrical coaxial orifices: Influence of cavitation induced pattern on oil drop size

High-pressure emulsion formation in cylindrical coaxial orifices: Influence of cavitation induced pattern on oil drop size

New regime of droplet generation in a T-shape microfluidic junction

Oil-in-Water Droplets Generation in Dripping Regime with Channel Partial Wetting

Contact Info

Product

Resources

About