Mass log-stable distribution of fragments in liquid–liquid jet fragmentation based on a two-step cascade between viscous shear instability and Rayleigh–Taylor instability

Rimbert, Nicolas; Hadj-Achour, Miloud; Ji, Bowen; Kewalramani, Gagan V.; Labergue, Alexandre; Dossmann, Yvan; Gradeck, Michel; Piluso, Pascal; Meignen, Renaud

doi:10.1016/j.ijmultiphaseflow.2023.104518

Cited by 4 publications

(3 citation statements)

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“…So, recently, Qiao et al demonstrated three modes of hydrogel microsphere formation in similar experiments using close liquids: Rayleigh-Plateau instability crushing mode, differential pressure crushing mode, and shear stress crushing mode. In this study, the Rayleigh-Plateau instability , begins to manifest itself when Q d > 0.04 mL/min. However, the boundary for the transition to this mode is heterogeneous (Figure a) and depends on Q c .…”

Section: Results and Discussionmentioning

confidence: 77%

“…Geometry is usually divided into three groups: cross-flow, coflow, and flowfocusing. 10,11 In coflow geometry, the dispersed phase and the continuous medium flow in parallel in two concentric channels.…”

Section: Introductionmentioning

confidence: 99%

“…These forces are influenced by the characteristics of the liquid phase (such as the viscosity, flow rate, and presence of surfactants), the channel’s diameter and wettability, and its geometry. Geometry is usually divided into three groups: cross-flow, coflow, and flow-focusing. , In coflow geometry, the dispersed phase and the continuous medium flow in parallel in two concentric channels. Because of this distinctive feature, devices with this geometry are usually made of glass.…”

Section: Introductionmentioning

confidence: 99%

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Droplet Microfluidic Method for Estimating the Dynamic Interfacial Tension of Ion-Crosslinked Sodium Alginate Microspheres

Ashikhmin,

Piskunov,

Kochkin

et al. 2024

Langmuir

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The research focuses on optimizing the production of hydrogel microspheres using droplet microfluidics for pharmaceutical and bioengineering applications. A semiempirical method has been developed to predict the dynamic interfacial tension at the interface of ion-cross-linked sodium alginate microsphere-sunf lower oil modified with glacial acetic acid and Tween 80 surfactant. These microspheres are produced in a smallscale coaxial device that is manufactured using affordable DLP/LCD 3D printing technology with a transparent photopolymer. The method was tested to design the minireactor in the device, which allows for the production of fully cross-linked microspheres that are ready for use at the output of the reactor without additional cross-linking steps in the microsphere collector. The mathematical expression for estimating the interfacial tension at the moment of formation of a hydrogel microsphere includes the Reynolds number for a two-phase liquid, the Ohnesorge number, and the surface tension at the liquid−air interface for continuous medium flow (modified oil). The reliability of the prediction is confirmed for continuous medium and dispersed phase flow rates of 0.8−3.2 and 0.01−0.08 mL/min, respectively. The evolution of the interfacial tension from the moment the microspheres formed and the estimated ultimate interfacial tension in a cross-linked hydrogel−modified oil system contributed to the reliable determination of the linear size of a minireactor. The ultimate interfacial tension of 76.5 ± 0.3 mN/m was determined using the Young−Laplace equation, which is based on measuring the surface free energy of the hydrogel as soft matter using the Owens-Wendt method. Additionally, the equilibrium static contact angle of the fully cross-linked hydrogel surface wetted with oil is measured using the sessile drop method. From a practical perspective, a method for optimizing and streamlining the high-tech manufacturing of cross-linked polymer microspheres and mini-and microchannel devices for use in bioengineering and pharmaceutical applications is suggested.

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Section: Results and Discussionmentioning

confidence: 77%

Section: Introductionmentioning

confidence: 99%