Active motion of contaminated microbubbles

Ubal, Sebastian; Brown, Nathaniel H; Lu, Jiakai; Corvalán, Carlos M.

doi:10.1016/j.ces.2021.116574

Cited by 6 publications

(1 citation statement)

References 41 publications

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“…On the other hand, Levich [9] succeeded in explaining the surfactant effect on the drag force by accounting for the surface tension gradient, i.e., the Marangoni stress, caused by non-uniform distribution of the surface tension due to the adsorption of surfactant to the interface. Numerical simulations of contaminated fluid particles have been carried out so far by taking into account the Marangoni stress [2,[10][11][12][13][14][15][16][17][18][19][20], in contrast, measurements of the Marangoni stress and the interfacial surfactant concentration have rarely been carried out.…”

Section: Introductionmentioning

confidence: 99%

Single Contaminated Drops Falling through Stagnant Liquid at Low Reynolds Numbers

Hayashi

Motoki

Linden

et al. 2022

Fluids

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Numerical simulations of contaminated spherical drops falling through a stagnant liquid at low Reynolds numbers are carried out using the finite difference method. The numerical results are used to describe the behavior of the surfactant concentrations and to understand the surfactant effects on the fluid motions in detail. The predicted interfacial surfactant concentration, Γ, is almost zero for angles, θ, below a certain value (the stagnant-cap angle, θcap), whereas it steeply increases and reaches a large value for θ>θcap (the stagnant-cap region). The increase in the initial surfactant concentration, C0, in the drop enhances the adsorption from the drop to the interface, which results in the increase in Γ and the decrease in θcap. Peaks appear in the predicted Marangoni stresses around θcap, which causes similar peaks in the pressure distribution. The high-pressure spots prevent the fluid motion along the interface, which results in the formation of the stagnant-cap region and the attenuation of the tangential velocity in the continuous phase. The surfactant flux from the bulk to the interface decreases C in the vicinity of the interface for θ<θcap and the weak diffusion cannot compensate for the reduction in C by adsorption, which results in C at the interface smaller than C0. The pattern of the low C region is determined by the advection and does not smear out because of a small diffusive flux.

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