Numerical simulation of the crossing of a liquid-liquid interface by a droplet

Itawi, Hassan El; Lalanne, Benjamin; Massiera, Gladys; Sauze, Nathalie Le; Masbernat, Olivier

doi:10.1103/physrevfluids.5.093601

Cited by 7 publications

(4 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…According to our knowledge, no articles in the literature address the recycling of the continuous phase, a required step for sustainable production, especially when the continuous phase liquid goes up to 100 times the dispersed phase. This dependency can be harnessed in systems with an external force (i.e., centrifugal force) controlling the size of the generated droplets [30,31]. However, this adds other constraints, such as dependency on the rotation speeds, which are not unlimited.…”

Section: Waste Generationmentioning

confidence: 99%

Microfluidics for Polymer Microparticles: Opinion on Sustainability and Scalability

Itawi

Fadlallah

Perré

et al. 2023

Sustainable Chemistry

Self Cite

View full text Add to dashboard Cite

The microfluidic production of simple (microspheres) and core–shell (microcapsules) polymer microparticles, often called microencapsulation, has been the scope of several research works since the 1980s. It is a fast, thrifty, and efficient process because of its controlled properties, tuneability, and yield, which can reach 100%. However, the question of its greenness, sustainability, and scalability remains unclear, and more awareness/education is required in this field. The sustainability of production processes using microfluidic techniques can be realized/discussed based on three pillars: (i) waste generation, (ii) the solvents employed, and (iii) raw materials. On the other hand, although the scaling-up of these processes was reported on in several papers as procedures in which hundreds or thousands of microfluidic chips are set in parallel, the sustainability of this scale-up has not been addressed to our knowledge. This opinion paper highlights the advantages of microfluidic encapsulation processes, their greenness according to the above-mentioned pillars, (i–iii) and the necessary considerations to scale them up while preserving their sustainability.

show abstract

Section: Waste Generationmentioning

confidence: 99%

Microfluidics for Polymer Microparticles: Opinion on Sustainability and Scalability

Itawi

Fadlallah

Perré

et al. 2023

Sustainable Chemistry

Self Cite

View full text Add to dashboard Cite

show abstract

“…Microfluidic systems where the droplet size is determined by an external force like a centrifugal force instead of shearing, as in the continuous process of interface crossing encapsulation, are another option to eliminate this dependency. 162,163 The environmental impact of the dependency between the droplet size and the flow rates may also be eliminated through the recycling of the continuous phase.…”

Section: Extrusionmentioning

confidence: 99%

Green assessment of polymer microparticles production processes: a critical review

et al. 2022

Self Cite

View full text Add to dashboard Cite

show abstract

“…Coalescence, spreading, and migration of drops across fluid–fluid interfaces have intrigued researchers for several decades. , Migration of drops through an interface has been mostly realized, while drops settle under gravity or rise due to buoyancy, and in this context, the main focus has been on the study of the fluid column that drops pull with it. , On the other hand, coalescence of a drop with another miscible fluid is a highly complex process and widely investigated in the literature. , Drop–drop and drop–interface coalescence has been studied that proceeds through three consecutive steps, that is, film drainage, film rupture, and coalescence. , In certain scenarios, drops are released into a stagnant lighter liquid at the top which gets coalesced with the same liquid at the bottom. In such cases, gravity plays a crucial role in dispersing the film separating the drop and the liquid–liquid interface.…”

Section: Introductionmentioning

confidence: 99%

“…1,2 Migration of drops through an interface has been mostly realized, while drops settle under gravity or rise due to buoyancy, and in this context, the main focus has been on the study of the fluid column that drops pull with it. 1,3 On the other hand, coalescence of a drop with another miscible fluid is a highly complex process and widely investigated in the literature. 4,5 Drop−drop and drop−interface coalescence has been studied that proceeds through three consecutive steps, that is, film drainage, film rupture, and coalescence.…”

Section: ■ Introductionmentioning

confidence: 99%

Migration and Spreading of Droplets across a Fluid–Fluid Interface in Microfluidic Coflow

2022

View full text Add to dashboard Cite

Interfacial migration of droplets in microfluidic confinements has significant relevance in cell biology and biochemical assays. So far, studies on passive interfacial migration of droplets are limited to co-flow interfaces having small interfacial tension (IFT ∼ 1 mN/m). Here, we elucidate the migration and spreading of droplets (SiO-1000, SiO-100, FC40, and castor oil as phase 3, P3) across the interface between a pair of coflowing streams (PEG as P1, SiO-100, SiO-20, FC40, and olive oil as P2) having large IFT (∼10 mN/m), with the three different phases immiscible. Interfacial migration involving interfaces of large IFT is facilitated by confining droplets between the channel wall and coflow interface. We find that contact between droplets and the coflow interface is governed by the confinement ratio (i.e., the ratio of drop size to stream width) and the ratio of the capillary numbers of the coflowing streams. Depending on the sign of the spreading parameter (S) of the co-flowing phases, droplet migration or spreading at the interface is observed. While interfacial migration is observed for S 1 < 0 and S 2 > 0, droplet spreading is observed for S 1 < 0 and S 2 < 0, where S 1 and S 2 are P1 and P2 side spreading parameters, respectively. We investigate the droplet migration dynamics and time evolution of the contact line and the interface. Our results show that the speed of interfacial migration increases with increasing spreading parameter contrast between the coflowing phases. In the droplet spreading case, we experimentally study the variation in the spreading length with time, revealing three distinct regimes in good agreement with predictions from analytical scaling. Our study explores the interfacial transport of droplets involving high IFT interfaces, advancing the fundamental understanding of the topic that may find relevance in droplet microfluidics.

show abstract

Numerical simulation of the crossing of a liquid-liquid interface by a droplet

Cited by 7 publications

References 38 publications

Microfluidics for Polymer Microparticles: Opinion on Sustainability and Scalability

Microfluidics for Polymer Microparticles: Opinion on Sustainability and Scalability

Green assessment of polymer microparticles production processes: a critical review

Migration and Spreading of Droplets across a Fluid–Fluid Interface in Microfluidic Coflow

Contact Info

Product

Resources

About