Liquid–liquid slug flow: Hydrodynamics and pressure drop

Jovanović, Jovan; Zhou, Wenya; Rebrov, Evgeny V.; Nijhuis, T.A.; Hessel, Volker; Schouten, J.C.

doi:10.1016/j.ces.2010.09.040

Cited by 174 publications

(162 citation statements)

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“…This makes the choice of location for film thickness measurement difficult. Some authors report film measurements based on the thickness at the flat section midway between the front and rear caps (Han and Shikazono, 2009;Jovanovic et al, 2010). However, this is only possible when slug lengths are greater than the previously defined threshold of L Ã D P 1:86.…”

Section: Film Thickness Modelsmentioning

confidence: 99%

“…The focus of the present study is the magnitude of the film that exists in liquid-liquid slug flow regimes. Numerous researchers have completed numerical, (Araujo et al, 2012;Heil, 2001;Taha and Cui, 2004) and experimental, (Grimes et al, 2007;Irandoust and Andersson, 1989;Jovanovic et al, 2010) analysis of the deposition of the liquid film on the capillary wall. Some of these works have resulted in the development of a number of models to estimate the magnitude of the film; the details of the most referenced of these are listed in Table 1.…”

Section: Introductionmentioning

confidence: 99%

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Film thickness measurements in liquid–liquid slug flow regimes

Eain

Egan

Punch

2013

International Journal of Heat and Fluid Flow

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a b s t r a c tAt present there is significant interest in the development of small scale medical diagnostic equipment. These devices offer faster processing times and require smaller sample volumes than equivalent macro scale systems. Although significant attention has been focused upon their outputs, little attention has been devoted to the detailed fluid mechanics that govern the flow mechanisms within these devices. Conventionally, the samples in these small scale devices are segmented into distinct discrete droplets or slugs which are suspended in an organic carrier phase. Separating these slugs from the channel wall is a very thin film of the organic carrier phase.The magnitude of this film is the focus of the present study and the effects of sample slug length and carrier phase fluidic properties on the film are examined over a range of Capillary numbers. A non-intrusive optical technique was used to capture images of the flow from which the magnitude of the film was determined.The experimental results show that the film is not constant along the length of the slug; however above a threshold value for slug length, a region of constant film thickness exists. When compared with existing correlations in the literature, the experimental data showed reasonable agreement with the Bretherton model when the Capillary number was calculated based on the mean two phase flow velocity. However, significant differences were observed when the Capillary number was redefined to account for the mean velocity at the liquid interface, i.e., the mean slug velocity.Analysis of the experimental data revealed that it fell into two distinct flow regimes; a visco-capillary regime and a visco-inertial regime. A modified Taylor expression is presented to estimate the magnitude of the film for flows in the visco-capillary regime while a new model is put forward, based on Capillary and Weber numbers, for flows in the visco-inertial regime. Overall, this study provides some novel insights into parameters, such as aqueous slug length and carrier phase fluidic properties, that affect the thickness of the film in liquid-liquid slug flow regimes.

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Section: Film Thickness Modelsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Film thickness measurements in liquid–liquid slug flow regimes

Eain

Egan

Punch

2013

International Journal of Heat and Fluid Flow

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“…Choi et al [8] observed the flow properties of FB mixtures (mixed in surfactant solutions) passing through porous media. Jovanovića et al [9] measured the pressure drop in liquid-liquid (viz. water-toluene and ethylene glycol/water-toluene) slug flows through micro-sized channels and capillaries.…”

Section: Introductionmentioning

confidence: 99%

Flow Properties of Ultra-Fine Bubble Mixtures Passing through Micro-Apertures

Ushida¹,

Hasegawa²,

Narumi³

et al. 2015

JFCMV

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The flow properties of fine bubble mixture flows are investigated and reported. Few previous studies have focused on ultra-fine bubble (UFB) mixtures, which contain sub-micrometer sized bubbles. In this study, UFB mixtures of water and glycerol solution are passed through micro-sized slits and capillaries, and the resultant pressure drops are evaluated in comparison with those for water and aqueous glycerol alone. The experimentally measured pressure drop for slits (≤51 μm) and capillaries (≤81 μm) is less for UFB mixtures than for water and aqueous glycerol alone. This phenomenon is considered in terms of interface behavior and attributed to the electric interaction between an electric double layer and the UFBs. Furthermore, numerical observation for slip wall conditions is conducted, and the results for UFB mixtures agree with the predicted values for slip wall conditions.

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“…(6) Desenvolvimentos recentes em dinâmica de fluidos em micro canais podem ser encontradas em diversas aplicações como em micro-reatores (Kashid e Agar(7); Kashid et al (8)), em processos de extração líquido-líquido (Kashid et al (9)), em transporte de emulsões em meios porosos, que são relevantes em diversas aplicações como ciência ambiental (Ouyang et al(10); Allan et al (11)), bioengenharia, armazenamento de gases do efeito estufa, recuperação deóleo, entre outros (Hofman e Stein(12); Tallaskstad et al (13); Idowu e Blunt (14)). Além disso, o escoamento de emulsões tambémé utilizado como modelo para escoamentos na escala de poros (Roca(3)).…”

Section: Revisão Bibliográficaunclassified

“…(2-8),é expressa como uma força de corpo concentrada f c : (29) f c = σκ∇cδ ε (c) (2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14) em que κé a curvatura da interface, ∇cé o vetor normalà interface e δ ε (c) e uma aproximação contínua e suavizada da função Delta de Dirac (Fig 2.4), dada pela derivada da função de Heavside:…”

Section: Figura 23: Função Heaviside Suavizada(3)unclassified

Escoamento De Duas Gotas Através De Um Micro Capilar Reto

AZEVEDO¹

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Azevedo, Bruno Nieckele; Carvalho, Márcio da Silveira (Advisor). Flow of two drops through a straight microcapillary. Rio de Janeiro, 2014. 68p. MSc. Dissertation -Departamento de Engenharia Mecânica, Pontifícia Universidade Católica do Rio de Janeiro.Emulsions can be used as mobility control agent in enhanced oil recovery methods in order to achieve a more efficient sweep of the reservoir. The application of such technique requires full understanding of how emulsions flow in a porous material. The macroscopic flow behavior can be determined based on the pore scale flow, at which emulsions cannot be treated as a single phase non Newtonian liquid, since the drop diameters are in the same order of magnitude of the pore throats. Experiments by Cobos et al.(1) of flow of emulsions through constricted micro capillaries, wich served as a model to the geometry of a pore throat connecting two adjacent pore bodies, have shown the effect of the dispersed phase on the pressure drop for different flow conditions and emulsions characteristics. In order to widen the range of capillary number and drop size explored in the experiments and to determine the effect of interfacial tension, viscosity ratio, capillary geometry and determine the characteristics of the flow with more the one drop, we study the flow of a drops suspended in a continuous phase flowing through a constricted micro capillary. The evolution of the drop interface is determined by the level set method which is incorporated to a fully coupled implicit Navier Stokes solver based finite element method. We investigate the effect of an initial distance between the two drops, as well as the effects of the interfacial tension on the drops speed. The results provide a more detailed description of the flow of emulsions through pore throats.

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Liquid–liquid slug flow: Hydrodynamics and pressure drop

Cited by 174 publications

References 50 publications

Film thickness measurements in liquid–liquid slug flow regimes

Film thickness measurements in liquid–liquid slug flow regimes

Flow Properties of Ultra-Fine Bubble Mixtures Passing through Micro-Apertures

Escoamento De Duas Gotas Através De Um Micro Capilar Reto

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