Results 61 to 70 of about 1,650 (161)

Particle motion between parallel walls: Hydrodynamics and simulation [PDF]

, 2010
The low-Reynolds-number motion of a single spherical particle between parallel walls is determined from the exact reflection of the velocity field generated by multipoles of the force density on the particle’s surface.
Brady, John F., Swan, James W.
core  

The FMM‐BEM Method for the 3D Particulate Stokes Flow

Abstract and Applied Analysis, Volume 2014, Issue 1, 2014., 2014
This work introduces new functions based on the spherical harmonics and the solid harmonics which have been used to construct a multipole development for the 3D Stokes problem in order to reduce the operations costs in the BEM method. We show that the major properties of those functions are inherited from the solid harmonics.
Hassib Selmi, Mohamed Abdelwahed, Hatem Hamda, Lassaad El Asmi, Hassan Eltayeb   +4 more
wiley   +1 more source

Micro‐ and nanorobots from magnetic particles: Fabrication, control, and applications

Responsive Materials, Volume 2, Issue 4, November 2024.
Fabrication, assembly, and applications of magnetic micro‐ and nanoparticle (MNP)‐ based micro‐ and nanorobots (MNRs) are reviewed. We are seeking new opportunities for traditional colloidal science, specifically MNR‐this emerging interdisciplinary field involving mechanical engineering and biological engineering. Abstract Magnetic microparticles (MPs)
Xiaoyu Wang, Tao Yang, Quan Li
wiley   +1 more source

Effective swimming strategies in low Reynolds number flows

, 2011
The optimal strategy for a microscopic swimmer to migrate across a linear shear flow is discussed. The two cases, in which the swimmer is located at large distance, and in the proximity of a solid wall, are taken into account.
A. Najafi, A. Shapere, A.M. Leshansky, B. Behkam, C.M. Pooley, C.M. Pooley, D. Barthes-Biesel, D.J. Earl, E. Lauga, E.M. Purcell, F.P. Bretherton, G. Danker, G.P. Alexander, H.C. Marcos, J. Dunkel, J.E. Avron, J.R. Blake, M. Abkarian, M. Kraus, M. Leoni, N. Watari, P. Olla, P. Olla, P. Olla, R. Dreyfus, R. Dreyfus, R. Golestanian, R. Golestanian, R. Golestanian, S.R. Keller, T.S. Yu, V. Lobaskin, V. Vand, W.E. Paxton   +33 more
core   +2 more sources

Hydrodynamic mobility of a solid particle nearby a spherical elastic membrane. II. Asymmetric motion [PDF]

, 2017
In this paper, we derive analytical expressions for the leading-order hydrodynamic mobility of a small solid particle undergoing motion tangential to a nearby large spherical capsule whose membrane possesses resistance towards shearing and bending ...
Daddi-Moussa-Ider, Abdallah, Gekle, Stephan, Lisicki, Maciej   +2 more
core   +2 more sources

The theory and application of Navier-Stokeslets (NSlets) [PDF]

Physics of Fluids, 2019
Consider a closed body moving in an unbounded fluid that decays to rest in the far-field and governed by the incompressible Navier-Stokes equations. By considering a translating reference frame, this is equivalent to a uniform flow past the body. A velocity representation is given as an integral distribution of Green’s functions of the Navier-Stokes ...
openaire   +1 more source

The effect of external flow on 3D orientation of a microscopic sessile suspension feeder, Vorticella convallaria

Annals of the New York Academy of Sciences, Volume 1537, Issue 1, Page 51-63, July 2024.
Vorticella are microscopic sessile suspension feeders that live attached to substrates in aquatic environments. They feed using a self‐generated feeding current. Their feeding rate depends on an individual's orientation relative to the substrate and ambient flow. We exposed individuals to varying flow speeds and recorded their 3D orientation.
Tia Böttger, Brett Klaassen van Oorschot, Rachel E. Pepper   +2 more
wiley   +1 more source

Chiral sedimentation of extended objects in viscous media [PDF]

, 2009
We study theoretically the chirality of a generic rigid object's sedimentation in a fluid under gravity in the low Reynolds number regime. We represent the object as a collection of small Stokes spheres or stokeslets, and the gravitational force as a ...
G. Bantchev, H. Lodish, J. Happel, Nathan C. Keim, Nathan W. Krapf, S. Wolfram, T. A. Witten, Thomas A. Witten, W. M. Becker   +8 more
core   +3 more sources

Multiple Magneto‐Optical Microrobotic Collectives with Selective Control in Three Dimensions Under Water

Small, Volume 20, Issue 26, June 26, 2024.
The proposed strategy that combines magnetic and optical fields to achieve independent position control and task execution of multiple microrobotic collectives in 3D space. The magnetic field excites the self‐assembly of colloids and maintains the self‐assembled microrobotic collectives without disassembly, while the optical field drives selected ...
Mengmeng Sun, Shihao Yang, Jialin Jiang, Qianqian Wang, Li Zhang   +4 more
wiley   +1 more source

Brownian Dynamics of a Sphere Between Parallel Walls

, 2000
We describe direct imaging measurements of a colloidal sphere's diffusion between two parallel surfaces. The dynamics of this deceptively simple hydrodynamically coupled system have proved difficult to analyze. Comparison with approximate formulations of
Blake J. R., D Altman, D. G Grier, Dufresne E. R., E. R Dufresne, Grier D. G., Hair M. L., Happel J., Oseen C. W.   +8 more
core   +1 more source