Dynamics and stability of a concentric compound particle – a theoretical study

S., Chaithanya K. V.; Thampi, Sumesh P.

doi:10.1039/c9sm01332f

Cited by 10 publications

(4 citation statements)

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“…The analysis shows that increasing the viscosity ratio of the outer fluid to the inner fluid or the size ratio of the drop to the particle will reduce the deformation of the encapsulating drop. The effects of size ratio and viscosity ratio are similar to that of a passive compound particle reported earlier [25,26].…”

Section: Discussionsupporting

confidence: 82%

“…If the deformation time scale is larger than the timescale in which the swimmer changes its orientation from an unfavorable configuration to a favorable configuration, it stabilizes the encapsulating drop which would have otherwise undergone breakup. This behaviour is in contrast to a rotating passive compound particle where the rotating particle does not have any effect on the droplet deformation [25,26].…”

Section: Discussionmentioning

confidence: 71%

“…The velocity field around a spherical particle (without encapsulation) in a simple shear flow is shown in figure 2(b). The problem of compound particle in a simple shear flow has been addressed in earlier works [25,26] and here we have given the solution in terms of Lamb's general solution.…”

Section: Subproblem 2: Passive Compound Particle In a Shear Flowmentioning

confidence: 99%

“…Expressions for the constants in the above equations are given in the appendix B. Similar to the case of an active compound particle, for a passive compound particle in a shear flow, drop shape is described by defining a scalar function, S = r − b[1 + fP 6 CaP 2 2 (cos θ) sin 2ϕ], where f P is an unknown constant [26]. The above mentioned velocity field is used to determine f P thus determining the evolution of the interface.…”

Section: Subproblem 2: Passive Compound Particle In a Shear Flowmentioning

confidence: 99%

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Deformation dynamics of an active compound particle in an imposed shear flow—a theoretical study

Thampi

2020

J. Phys. D: Appl. Phys.

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Active particles encapsulated in a droplet are called active compound particles. In addition to the activity induced fluid flows, these multiphase structures may experience imposed flows in the process of generating and manipulating them in microfluidic devices or in their natural habitats. Therefore, we investigate the deformation dynamics and stability of a drop encapsulating a model microswimmer, a spherical squirmer (shaker) concentrically placed in a drop, when subjected to an imposed shear flow. Using Lamb’s general solution, Stokes equations are solved to determine the flow field and consequently the shape of the droplet interface. Shear flow always deforms the drop and the flow induced by the active particle may enhance or impede this deformation based on its orientation. The extent of deformation also depends on (i) the size of the active particle and the droplet, (ii) the viscosity of the droplet fluid and the fluid in which it is dispersed, (iii) the orientation of the active particle, and (iv) the relative strength of activity and imposed shear. Finally we find that the presence of an imposed vorticity field has a stabilizing effect on the active compound particle as it rotates the encapsulated swimmer and the drop undergoes a time periodic deformation.

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Section: Discussionsupporting

confidence: 82%

Section: Discussionmentioning

confidence: 71%

Section: Subproblem 2: Passive Compound Particle In a Shear Flowmentioning

confidence: 99%

Section: Subproblem 2: Passive Compound Particle In a Shear Flowmentioning

confidence: 99%

See 2 more Smart Citations