Open Access
Liquid-liquid slug flow hydrodynamics and pressure drop in micro channels
J. Jovanovic,Evgeny V. Rebrov,T.A. Nijhuis,Volker Hessel,J.C. Schouten +4 more
- pp 78-78
TLDR
In this article, the hydrodynamics and the pressure drop of liquid-liquid slug flow in round microcapillaries are presented, and two models are presented: the stagnant film model and the moving film model.Abstract:
Abstract In this paper, the hydrodynamics and the pressure drop of liquid–liquid slug flow in round microcapillaries are presented. Two liquid–liquid flow systems are considered, viz. water-toluene and ethylene glycol/water-toluene. The slug lengths of the alternating continuous and dispersed phases were measured as a function of the slug velocity (0.03–0.5 m/s), the organic-to-aqueous flow ratio (0.1–4.0), and the microcapillary internal diameter (248 and 498 μm). The pressure drop is modeled as the sum of two contributions: the frictional and the interface pressure drop. Two models are presented, viz. the stagnant film model and the moving film model. Both models account for the presence of a thin liquid film between the dispersed phase slug and the capillary wall. It is found that the film velocity is of negligible influence on the pressure drop. Therefore, the stagnant film model is adequate to accurately predict the liquid–liquid slug flow pressure drop. The influence of inertia and the consequent change of the slug cap curvature are accounted for by modifying Bretherton’s curvature parameter in the interface pressure drop equation. The stagnant film model is in good agreement with experimental data with a mean relative error of less than 7%.read more
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Proposed Correlation of Data for Isothermal Two-Phase, Two-Component Flow in Pipes
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Formation of droplets and bubbles in a microfluidic T-junction-scaling and mechanism of break-up.
TL;DR: Experimental results support the assertion that the dominant contribution to the dynamics of break-up arises from the pressure drop across the emerging droplet or bubble.
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Monodisperse Double Emulsions Generated from a Microcapillary Device
Andrew S. Utada,Elise Lorenceau,Darren R. Link,Peter D. Kaplan,Howard A. Stone,David A. Weitz +5 more
TL;DR: It is shown that the droplet size can be quantitatively predicted from the flow profiles of the fluids, which makes this a flexible and promising technique.
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