FENE-P fluid flow generated by self-propelling bacteria with slip effects

Asghar, Zeeshan; Shah, Rehman Ali; Shatanawi, Wasfı; Ali, Nasir

doi:10.1016/j.compbiomed.2022.106386

Cited by 12 publications

(2 citation statements)

References 28 publications

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“…4 Therefore, research into the dynamics of swimmers in such environments is of vital importance to understand many biological transport processes, as well as for the development of potential future artificial micro-machines, which could be used for targeted delivery in complex fluid environments. [5][6][7][8][9] Most studies on the dynamics of microswimmers in inhomogeneous multi-phase systems have focused on swimming in the vicinity of boundaries, mainly solid-fluid boundaries [10][11][12][13][14][15][16][17][18][19] and fluid-air interfaces 10,20 , or have been restricted to simplified 2D systems [21][22][23] . For example, Lauga et al 17 showed that E. coli was shown to exhibit a clockwise circular swimming motion near a solid-fluid boundary, whereas Leonardo et al 20 report a counterclockwise rotation near a free surface, such as the fluid-air interface.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of microswimmers near a liquid–liquid interface with viscosity difference

et al. 2023

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Transport of material across liquid interfaces is ubiquitous for living cells and is also a crucial step in drug delivery and in many industrial processes. The fluids that are present on either side of the interfaces will usually have different viscosities. We present a physical model for the dynamics of microswimmers near a soft and penetrable interface that we solve using computer simulations of Navier–Stokes flows. The literature contains studies of similar isoviscous fluid systems, where the two fluids have the same viscosity. Here, we extend this to the more general case where they have different viscosities. In particular, we investigate the dynamics of swimmers approaching a fluid–fluid interface between phase-separated fluids with distinct viscosities. We find that the incoming angle, viscosity ratio, and swimming type (i.e., pusher, puller, or neutral) strongly influence the collision, resulting in four distinct dynamical modes: bouncing, sliding, penetrating, and hovering. The former three modes are also observed for isoviscous systems, while the hovering, in which strong pullers swim parallel to the interface at a non-zero distance, requires mismatched viscosities. Furthermore, swimmers exhibit a preference for lower viscosity fluids, known as viscotaxis. This implies that, for a wide distribution of contact angles, more swimmers will transition into the low-viscosity environment than vice versa. Consequently, a swimmer starting in a low-viscosity fluid is more likely to bounce back at the interface, while a swimmer in a high-viscosity fluid is more likely to penetrate the interface and enter the lower viscosity fluid.

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Section: Introductionmentioning

confidence: 99%

Dynamics of microswimmers near a liquid–liquid interface with viscosity difference

et al. 2023

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“…The mass transfer effects were explored considering the chemical reactions. Undoubtedly, various computational (analytical and numerical) schemes [39][40][41][42][43][44][45][46][47] are available in the existing literature. Here, the nonlinear problems were computed using a homotopic ap-proach [48][49][50] for convergent series solutions.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Nonlinear Convection–Radiation in Chemically Reactive Oldroyd-B Nanoliquid Configured by a Stretching Surface with Robin Conditions: Applications in Nano-Coating Manufacturing

et al. 2022

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Motivated by emerging high-temperature manufacturing processes deploying nano-polymeric coatings, the present study investigates nonlinear thermally radiative Oldroyd-B viscoelastic nanoliquid stagnant-point flow from a heated vertical stretching permeable surface. Robin (mixed derivative) conditions were utilized in order to better represent coating fabrication conditions. The nanoliquid analysis was based on Buongiorno’s two-component model, which features Brownian movement and thermophoretic attributes. Nonlinear buoyancy force and thermal radiation formulations are included. Chemical reactions (constructive and destructive) were also considered since coating synthesis often features reactive transport phenomena. An ordinary differential equation model was derived from the primitive partial differential boundary value problem using a similarity approach. The analytical solutions were achieved by employing a homotopy analysis scheme. The influence of the emerging dimensionless quantities on the transport characteristics was comprehensively explained using appropriate data. The obtained analytical outcomes were compared with the literature and good correlation was achieved. The computations show that the velocity profile was diminished with an increasing relaxation parameter, whereas it was enhanced when the retardation parameter was increased. A larger thermophoresis parameter induces an increase in temperature and concentration. The heat and mass transfer rates at the wall were increased with incremental increases in the temperature ratio and first order chemical reaction parameters, whereas contrary effects were observed for larger thermophoresis, fluid relaxation and Brownian motion parameters. The simulations can be applied to the stagnated nano-polymeric coating of micromachines, robotic components and sensors.

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A numerical framework for modeling the dynamics of micro-organism movement on Carreau-Yasuda layer

2023

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Gliding motility often noticed in phylogenetically rod-shaped bacteria which locomote via dissipating their own energy. The said gliding motion via producing waves and secreting slime is generally witnessed in gram-negative bacteria. The influence of Inertia in slime layer beneath glider is also a significant feature to this mechanism. The propulsive microbe pushes the slime backwards, while reactive forces in the slime aids a forward movement of the propeller. Out of several motility modes the complex wavy gliding mechanism is considered here so one can approximate the glider's surface by undulating two-dimensional sheet. Moreover, the non-Newtonian slime beneath the organism is taken as Carreau Yasuda fluid. Following a traditional approach of a fluid flow problem balance of mass and momentum is utilized. The x and y-component of momentum equation is combined and reduced into fourth order DE via lubrication and creeping flow assumption. For suitable values of rheological parameters, swimming gait and some initial values of gliding speed and flow rate, the BVP is solved via MATLAB build in routine bvp-5c. Modified Newton-Raphson algorithm is employed to simulate the unknowns present in the boundary conditions. Power required by the glider, velocity of the slime and level curves are also obtained with the aid of these realistic numerical pairs. The computed results are plotted in the latest available version of MATLAB (2021a) and discusses in detail.

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FENE-P fluid flow generated by self-propelling bacteria with slip effects

Cited by 12 publications

References 28 publications

Dynamics of microswimmers near a liquid–liquid interface with viscosity difference

Dynamics of microswimmers near a liquid–liquid interface with viscosity difference

Analysis of Nonlinear Convection–Radiation in Chemically Reactive Oldroyd-B Nanoliquid Configured by a Stretching Surface with Robin Conditions: Applications in Nano-Coating Manufacturing

A numerical framework for modeling the dynamics of micro-organism movement on Carreau-Yasuda layer

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