Orientational Distributions of a Ferromagnetic Spherocylinder Particle in a Simple Shear Flow

2002 ◽  
Author(s):  
Masayuki Aoshima ◽  
Akira Satoh ◽  
Geoff N. Coverdale ◽  
Roy W. Chantrell
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Shear Flow ◽  
Flow Field ◽  
Simple Shear ◽  
Applied Magnetic Field ◽  
Spherical Particles ◽  
Simple Shear Flow ◽  
Microstructure Formation ◽  
Base Liquid

A ferrofluid is a suspension of ferromagnetic spherical particles in a base liquid (1), and is well known as a functional fluid which responds to an external magnetic field to give a large increase in the viscosity. Such a significant increase in the viscosity is due to the fact that chain-like clusters are formed owing to magnetostatic interactions between particles in an applied magnetic field. The microstructure formation offers a large resistance to a flow field that gives rise to a significant increase of the apparent viscosity (2).

An Application of Distributed Computing to the Finite Element Investigation of Lift Force on a Freely-Rotating Sphere in Simple Shear Flow

1999 ◽  
Author(s):  
Gustavo C. Buscaglia ◽  
Hugo E. Ferrari ◽  
Pablo M. Carrica ◽  
Enzo A. Dari
Keyword(s):  
Finite Element ◽  
Shear Flow ◽  
Simple Shear ◽  
Lift Force ◽  
Cluster Computing ◽  
Low Cost ◽  
Lift Coefficient ◽  
Angular Acceleration ◽  
Spherical Particles ◽  
Simple Shear Flow

Abstract An application of “cluster computing” in finite element CFD is reported, demonstrating the feasibility of solving relevant 3D problems on low-cost architectures (PC’s connected by fast Ethernet network). The main ingredients of our implementation are described. The results concern the lift force on a solid particle in simple shear flow. It is shown that, if the particle is allowed to rotate freely about its center, the self-established rotation significantly alters the lift coefficient. in particular, the lift force points away from a wall for any Re (≤ 100), while if the particle does not rotate the lift changes sign. Suitable estimates for the typical time involved in the angular acceleration of solid spherical particles are derived.

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