Jeffery orbits in shear-thinning fluids

Abtahi, Arman; Elfring, Gwynn J.

doi:10.1063/1.5125468

Cited by 28 publications

(26 citation statements)

References 49 publications

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“…The rotation of an axisymmetric inertia-free spheroidal particle in the simple shear flow was described by Jeffery . It was shown that, in addition to rotation with the local angular velocity of the flow, the particle also has a rotational component that depends on its aspect ratio and orientation as the particle unequally experiences the surrounding velocity field. , Furthermore, as shown by Hinch and Leal, aberrations from the axisymmetric geometry lead to large changes in particle rotation.…”

Section: Resultsmentioning

confidence: 99%

Rotational Dynamics of a Protein under Shear Flow Studied by the Eckart Frame Formalism

Papež,

Merzel,

Praprotnik

2023

J. Phys. Chem. B

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Proteins are natural polymers that play an essential role in both living organisms and biotechnological applications. During certain bioprocessing steps, they can be exposed to significant mechanical stress induced by, for example, shear flow or sonication, resulting in reduced therapeutic efficacy, aggregation, or even a loss of activity. For this reason, there is a need to understand and determine the susceptibility of the protein activity to the experienced mechanical stress. To acquire this knowledge, it is necessary to study the rotational dynamics of the protein.Commonly, the rotational dynamics of soft molecules is interpreted based on a theoretical analysis performed in an inertial laboratory frame. However, the obtained angular velocity mixes pure rotations and vibrations with angular momentum, consequently lacking a clear dynamical interpretation. On the other hand, the use of the noninertial internal Eckart frame allows the determination of pure angular velocity as it minimizes the coupling between the rotational and vibrational degrees of freedom. In the present work, by conducting open-boundary molecular dynamics simulations and exploiting the Eckart frame formalism, we study the rotational dynamics of a small protein under the shear flow of various strengths. Our results show that the angular velocity increases nonlinearly with increasing shear rate. Furthermore, the protein gains vibrational angular momentum at higher shear rates, which is reflected in the higher angular velocity computed by employing the Eckart frame formalism and confirmed by analysis of the contributions to the total kinetic energy of the biomolecule.

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Section: Resultsmentioning

confidence: 99%

Rotational Dynamics of a Protein under Shear Flow Studied by the Eckart Frame Formalism

Papež,

Merzel,

Praprotnik

2023

J. Phys. Chem. B

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“…Rod-like particles rotate even in laminar ow, and during the rotation, they can buckle. [50][51][52][53][54] This buckling causes poor alignment of rod particles, and yields a macroscopic assembly that has an undensied structure. 20 This buckling behavior is controlled by the interplay of the elastic bending force and shear stresses.…”

Section: Aligning the Cnt Bundles In The Shear Owmentioning

confidence: 99%

Investigation of shear-induced rearrangement of carbon nanotube bundles using Taylor–Couette flow

et al. 2021

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“…For the particle in weakly shear-thinning fluids, the asymptotic analysis has been utilized to obtain the asymptotic solution of the non-Newtonian flow surrounding particles (Datt et al. 2015; Elfring 2017; Abtahi & Elfring 2019; van Gogh et al. 2022).…”

Section: Introductionmentioning

confidence: 99%

“…2022). Based on the reciprocal theorem and perturbation expansion, Abtahi & Elfring (2019) proposed an analytical torque model for an inertialess prolate particle immersed in a Stokesian shear flow of a Carreau-type fluid. Their model demonstrates that the particle in weak shear-thinning fluids retains the degeneracy of Jeffery orbits in Newtonian fluids, and the particle rotation rate is slightly attenuated by shear-thinning rheology.…”

Section: Introductionmentioning

confidence: 99%

Fluid-inertia torque on spheroids in pseudo-plastic fluid flows: effect of shear-thinning rheology

Li,

Xu,

Zhao

2023

J. Fluid Mech.

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Fluid-inertia torque remarkably affects the orientation of non-spherical particles in Newtonian flows whereas this torque induced by convective fluid inertia in particle-laden pseudo-plastic flows is still unknown. In the present study we numerically investigate the fluid-inertia torque on a neutrally buoyant spheroid in the Carreau-type pseudo-plastic fluid flows at finite Reynolds numbers with the immersed boundary method. The results show that compared with the fluid-inertia torque in Newtonian flows, the magnitude of the fluid-inertia torque on spheroids is remarkably attenuated by the shear-thinning rheology in pseudo-plastic fluid flows. The deviation of fluid-inertia torque between pseudo-plastic and Newtonian flows is more significant with decreasing Reynolds numbers, indicating the importance of the effect of shear-thinning rheology at small Reynolds numbers. Moreover, the spheroid rotation rate is reduced in pseudo-plastic fluids, and the equilibrium orientation of oblate spheroids changes non-monotonically with the shear-thinning effect in the linear shear flow of pseudo-plastic fluids. The present findings imply the importance of the effect of shear-thinning rheology on the torques of spheroids, which could be potentially applied for the control of particle orientations in pseudo-plastic fluids in the future.

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Jeffery orbits in shear-thinning fluids

Cited by 28 publications

References 49 publications

Rotational Dynamics of a Protein under Shear Flow Studied by the Eckart Frame Formalism

Rotational Dynamics of a Protein under Shear Flow Studied by the Eckart Frame Formalism

Investigation of shear-induced rearrangement of carbon nanotube bundles using Taylor–Couette flow

Fluid-inertia torque on spheroids in pseudo-plastic fluid flows: effect of shear-thinning rheology

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