A particle pair model for magnetorheological fluids

Constantin Ciocanel; Glenn Lipscomb; Nagi G. Naganathan

doi:10.1117/12.658743

6 April 2006 A particle pair model for magnetorheological fluids

Constantin Ciocanel, Glenn Lipscomb, Nagi G. Naganathan

Proceedings Volume 6170, Smart Structures and Materials 2006: Active Materials: Behavior and Mechanics; 61700S (2006) https://doi.org/10.1117/12.658743
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2006, San Diego, California, United States

Abstract

A microstructural model of the motion of particle pairs in MR fluids is proposed that accounts for both hydrodynamic and magnetic field forces. A fluid constitutive equation is derived from the model that allows prediction of velocity, particle structure and yield stress. Results for simple shear and elongational flows are presented for cases where particle pairs remain in close contact so they are hydrodynamically equivalent to an ellipsoid of aspect ratio two. In this limiting case, only the magnetic force component normal to the vector connecting the centers of a particle pair affects motion. Shear flow results indicate particle pairs rotate continuously with the flow at low magnetic fields while a steady state is reached at high fields. For elongational flows, when the applied magnetic field is parallel to the elongation direction, particle pairs orient in the field/flow direction. Either orientation is possible when the field is perpendicular to the flow. A second theoretical approach to the prediction of the yield stress is presented. Predictions for various shear rates and magnetic fields are compared with experimental data. The comparison indicates a good agreement between model predictions and experimental data at low to moderate magnetic fields.

Citation Download Citation

Constantin Ciocanel, Glenn Lipscomb, and Nagi G. Naganathan "A particle pair model for magnetorheological fluids", Proc. SPIE 6170, Smart Structures and Materials 2006: Active Materials: Behavior and Mechanics, 61700S (6 April 2006); https://doi.org/10.1117/12.658743

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available