Laminar flow deformation of a droplet adhering to a wall in a channel

Seevaratnam, G.K.; Ding, Hang; Michel, Olivier; Heng, Jerry Y. Y.; Matar, Omar

doi:10.1016/j.ces.2010.04.012

Cited by 43 publications

(24 citation statements)

References 40 publications

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“…In earlier models, the droplet was assumed to be a solid particle. Only complex numerical simulations modeling the continuous droplet deformation under flow have allowed good prediction of the drop behavior [10][11][12]. But these studies are restricted to simple fluid compositions and large contact angles (above 80°).…”

Section: Introductionmentioning

confidence: 99%

“…A number of theoretical studies have considered the motion, deformation and detachment of pure droplets adhering to solid substrates under the effect of a pure liquid laminar flow, as detailed in reference [10]. In earlier models, the droplet was assumed to be a solid particle.…”

Section: Introductionmentioning

confidence: 99%

“…In order to find a generality in the results, theoretical and experimental studies have expressed their findings as a function of dimensionless numbers [10,12,13]. The dimensionless numbers that play a role in degreasing are the capillary number Ca, which is the ratio of viscous to interfacial forces, the Reynolds number Re, which is the ratio of inertial to viscous forces and the Bond number Bo, which is the ratio of gravitational to capillary forces.…”

Section: Introductionmentioning

confidence: 99%

“…But these studies are restricted to simple fluid compositions and large contact angles (above 80°). A few experimental studies have investigated the problem [10,[12][13][14][15]. They have mainly aimed at characterizing the critical flow conditions above which droplets deform on the solid surface or detach from it in an irreversible manner.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Effect of Surfactants on the Deformation and Detachment of Oil Droplets in a Model Laminar Flow Cell

Fréville

Hecke

Ernenwein

et al. 2013

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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IFP Energies nouvelles International Conference Rencontres Scientifiques d'IFP Energies nouvellesRe´sume´-É tude de l'effet de tensioactifs sur la de´formation et le de´tachement de gouttes d'huiles mode`les a`l'aide d'une cellule a`flux laminaire -Les tensioactifs « verts » a`teˆte polaire de´rive´e de sucre (glucose, pentose) sont de plus en plus pre´sents dans les formulations de´tergentes en raison des re´glementations en vigueur et des demandes des consommateurs. Dans le but d'e´tudier le pouvoir de´tergent de ces nouvelles mole´cules, le comportement de gouttes d'huiles mode`les soumises a`un flux de solution de´tergente de concentration variable, a e´te´e´tudie´a`l'aide d'une cellule a`flux laminaire et corre´le´aux proprie´te´s physicochimiques des syste`mes aux interfaces liquide/liquide et solide/liquide/liquide. Trois comportements principaux ont e´te´observe´s à partir d'une valeur critique du de´bit de de´tergent : un e´talement, un fractionnement de la goutte ou bien son de´tachement spontane´de la surface. L'analyse des re´sultats a montre´une corre´lation entre le comportement de la goutte et l'e´quilibre des forces s'exerc¸ant sur la goutte dans sa position initiale (avant l'application du flux), en particulier en conside´rant la force de gravite´, qui tend a`de´tacher la goutte de la surface, et la force capillaire, qui tend a`maintenir sa forme sphe´rique. Un diagramme d'e´tat a pu eˆtre e´tabli, permettant de pre´dire le comportement de la goutte, en fonction du nombre de Bond (rapport des forces de gravite´sur les forces capillaires) et du cosinus de l'angle de contact de la goutte dans sa position initiale. Les re´sultats obtenus ont permis de comparer les performances de diffe´rents tensioactifs en termes de de´graissage et d'illustrer le potentiel des AlkylPolyPentosides (APP) pour cette application.Abstract -Effect of Surfactants on the Deformation and Detachment of Oil Droplets in a Model Laminar Flow Cell -Sugar-based surfactants are increasingly present in the development of ecofriendly detergents due to current regulations and consumer demand. In order to assess the degreasing performance of these new surfactants, the behavior of model oil droplets subjected to the action of a flow of surfactant solutions of different concentrations was studied in a laminar flow cell and related to the physico-chemical properties measured at the liquid/liquid (interfacial tension) and solid/liquid/liquid interfaces (contact angle). With the surfactant solutions and the model oils employed in this study, three main behaviors were observed when a critical flow rate was reached: elongation, fragmentation or spontaneous detachment of the droplet. The analysis of the results leads to a correlation between the droplet behavior and the balance of the forces applied on the droplet in

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of Surfactants on the Deformation and Detachment of Oil Droplets in a Model Laminar Flow Cell

Fréville

Hecke

Ernenwein

et al. 2013

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

View full text Add to dashboard Cite

show abstract

“…S. van der Graaf and T. Nisisako [14] investigated the formation of droplet in T micro-channels using Lattice Boltzmann method, and proved that the simulation results match well with the experiments. Seevaratnam G. K. [15] pored over the deformation of droplets clinging to solid surfaces under constant water-driven pressure difference, and recorded the thresholds of droplet sliding and separation with a highresolution camera. The scholar concluded that the droplet deformation hinges on flow rate, viscosity ratio and volume of the droplet.…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamics of residual oil droplet displaced by polymer solution in micro-channels of lipophilic rocks

Fan¹,

Liu²,

Liu³

et al. 2017

IJHT

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The upper-convected Maxwell model was adopted to describe the rheological properties of polymer solutions. Then, the author established the flow equations of viscoelastic polymer solutions in pore channels and constructed a 3D flowing model of the displacing fluid. Next, the flow distribution was numerically calculated to obtain the stress distribution of the flow, the residual oil was displaced by a viscoelastic polymer solution in 3D micro-channels, and the horizontal stress difference and normal partial stress were recorded horizontal and vertical to the flow direction. Thereafter, the hydrodynamics of the residual oil displaced with a viscoelastic polymer solution was investigated from a hydrodynamic perspective. It is concluded that: the Weissenberg number has a major impact on the deformation index. As the Weissenberg number increases, the advancing angle increases while the receding angle decreases, thus pushing up the deformation index. With further increase in the Weissenberg number, the deformation index first increases linearly and then parabolically. In the research, the deformation and breakage of the residual oil in the polymer waterflooding were observed through the microscopic displacement visualization experiment, and the stress state of the residual oil in the displacement process was qualitatively analysed. With numerical simulation, this research provides fresh insights into the stress state of the residual oil in displacement.

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Flow measurements in the wake of an adhering and oscillating droplet using laser-Doppler velocity profile sensor

Burgmann

Dues²,

Barwari

et al. 2021

Exp Fluids

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The removal of droplets on surfaces by an (air-) flow is relevant, e.g., for cleaning processes or to prevent corrosion or damage of electronic devices. Still the condition for droplet movement is not fully understood. Droplets start to move downstream at a critical (air-) flow velocity vcrit. For increasing flow velocity, this process is related to a strong oscillation of the droplet. This oscillation is supposed to be a key mechanism for the onset of droplet movement in conjunction with the flow field around the droplet. We report on measurements in the wake of the adhering droplet by means of laser-Doppler velocity profile sensor and hot wire anemometry. Thanks to the excellent spatial and temporal resolution of laser-Doppler velocity profile sensor and its capability to measure bidirectional flows, a backflow region can be detected in the wake of the droplet. Therefore, it can be concluded that this backflow structure is the driving mechanism for the strong flow movement inside the droplet against channel flow direction found in previous work. Analyzing the frequency spectra of the flow velocity, it was found that the flow is also oscillating; frequency peaks are in the same range as for the contour oscillation. Based on frequency, diameter and flow velocity, a Strouhal number can be calculated. This Strouhal number is almost constant in the investigated regime of droplet volumes and is between 0.015 and 0.03. Therefore, it can be assumed that an aeroelastic self-excitation effect may be present that eventually leads to droplet movement. Graphic abstract

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Laminar flow deformation of a droplet adhering to a wall in a channel

Cited by 43 publications

References 40 publications

Effect of Surfactants on the Deformation and Detachment of Oil Droplets in a Model Laminar Flow Cell

Effect of Surfactants on the Deformation and Detachment of Oil Droplets in a Model Laminar Flow Cell

Hydrodynamics of residual oil droplet displaced by polymer solution in micro-channels of lipophilic rocks

Flow measurements in the wake of an adhering and oscillating droplet using laser-Doppler velocity profile sensor

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