Abstract The transport of motile microorganisms is strongly influenced by fluid flows that are ubiquitous in biological environments. Here we demonstrate the impact inertia. We analyze dynamics a microswimmer pressure-driven Poiseuille flow, where inertia small but non-negligible. Using perturbation theory and reciprocal theorem, show addition to classical inertial lift passive particles, active nature generates ‘swimming lift’, which evaluate for neutral pusher/puller-type swimmers....

Janus particles self-propel by generating local tangential concentration gradients along their surface. These are present in a thin layer whose thickness is small compared to the particle size. Chemical asymmetry surface prerequisite generate chemical gradient, which gives rise diffusioosmotic flows region around particle. This results an effective slip on observed "swimming" motion of freely suspended even absence externally imposed gradients.Motivated chemotactic behaviour biological...

In Newtonian fluids, microswimmers need to perform a non-reciprocal shape change move forward. However, this is no longer required in biological fluids with their viscoelastic properties. work, we investigate an oscillating two-sphere swimmer weakly fluid and show that the moves toward smaller sphere. We use flow fields generated by individual spheres. Since they contain contribution quadratic sphere velocities, forces needed expand contract differ from each other. This causes non-zero net...

Driven by the necessity to achieve a thorough comprehension of bottom-up fabrication process functional materials, this experimental study investigates pairwise interactions or collisions between chemically active SiO2–Pt Janus colloids. These are categorized based on colloids' orientations before and after they make physical contact. In addition hydrodynamic interactions, colloids also known affect each other's chemical field, resulting in chemophoretic which depend degree surface...

Process simplification by integrating Fischer–Tropsch synthesis (FTS) with hydrocracking (HC) in a microstructured reactor was studied experimentally and modeling simulation. A simplified model created to investigate the observed FTS HC performance presence of larger amounts liquid. It is assumed that part catalyst would be blocked if liquid fraction exceeds threshold. The blocking cause enlarged diffusion resistance or even inaccessible regions bed, particularly reactors broad flat channels...

Janus particles propel themselves by generating concentration gradients along their active surface. This induces a flow near the surface, known as diffusio-osmotic slip, which propels particle even in absence of externally applied gradients. In this work, we study influence viscoelasticity and shear-thinning (described second-order-fluid Carreau model, respectively) on slip an Using matched asymptotic expansions, provide analytical expression for modification induced non-Newtonian behavior....

The current work studies the dynamics of a microswimmer in pressure-driven flow weakly viscoelastic fluid. Employing second-order fluid model, we show that self-propelling swimmer experiences swimming lift addition to well-known passive arises from its resistance shear flow. Using reciprocal theorem, evaluate analytical expressions for experienced by neutral and pusher/puller-type swimmers they depend on hydrodynamic signature associated with mechanism. We find that, comparison particles,...

A recent article (Khair and Kabarowski; Phys. Rev. Fluids 5, 033702) has studied the cross-streamline migration of electrophoretic particles in unbounded shear flows with weak inertia or viscoelasticity. That work compares their results those reported two our previous studies (Choudhary et al.: J. Fluid Mech. 874; 898) reports a disagreement derived analytical expressions. In this comment, we resolve discrepancy. For viscoelastic flows, show that Khair Kabarowski have not accounted for...

It has been recently shown that it is possible to design simple artificial swimmers at low Reynoldsnumber possess only one degree of freedom and, nevertheless, can overcome Purcell's celebratedscallop theorem. One the few examples given by Montino and DeSimone, Eur. Phys. J. E, vol.38, 2015, who consider three-sphere Swimmer Najafi Golestanian, replacing active armwith a passive elastic spring. We further generalize this idea increasing number springs andshow invert swimming direction using...

Abstract Microswimmer suspensions in Newtonian fluids exhibit unusual macroscale properties, such as a superfluidic behavior, which can be harnessed to perform work at microscopic scales. Since most biological are non-Newtonian, here we study the rheology of microswimmer suspension weakly viscoelastic shear flow. At individual level, find that stresses generated by activity substantially modify Jeffery orbits well-known from fluids. The orientational dynamics depends on swimmer type;...

Microswimmer suspensions in Newtonian fluids exhibit unusual macroscale properties, such as a superfluidic behavior, which can be harnessed to perform work at microscopic scales. Since most biological are non-Newtonian, here we study the rheology of microswimmer suspension weakly viscoelastic shear flow. At individual level, find that stresses generated by activity substantially modify Jeffery orbits well-known from fluids. The orientational dynamics depends on swimmer type; especially...

Driven by the necessity to achieve a thorough comprehension of bottom-up fabrication process functional materials, this experimental study investigates pair-wise interactions or collisions between chemically active SiO2-Pt Janus Colloids. These are categorized based on colloids orientations before and after they make physical contact. In addition hydrodynamic interactions, also known affect each others chemical field, resulting in chemophoretic which depend degree surface anisotropy...

The current work studies the dynamics of a microswimmer in pressure-driven flow weakly viscoelastic fluid. Employing second-order fluid model, we show that self-propelling swimmer experiences swimming lift addition to well-known passive arises from its resistance shear flow. Using reciprocal theorem, evaluate analytical expressions for experienced by neutral and pusher/puller-type swimmers they depend on hydrodynamic signature associated with mechanism. We find focusing towards centerline is...

We analyze the dynamics of a microswimmer in pressure-driven Poiseuille flow, where fluid inertia is small but non-negligible. Using perturbation theory and reciprocal theorem, we show that addition to classical inertial lift passive particles, active nature generates `swimming lift', which evaluate for neutral pusher/puller-type swimmers. Accounting engenders rich spectrum novel complex including bistable states, tumbling coexists with stable centerline swimming or swinging. The sensitive...