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MRF in a plate-plate magnetorheometer

Numerical insight into the particle-wall interface
 
: Lagger, H.; Bierwisch, C.; Moseler, M.

:
Preprint urn:nbn:de:0011-n-2364385 (1.4 MByte PDF)
MD5 Fingerprint: 6df8ed509c1cdc205669ff484d39b707
Created on: 13.11.2013

Fulltext (PDF; )

Journal of physics. Conference series 412 (2013), No.1, Art.012020
ISSN: 1742-6588
ISSN: 1742-6596
English
Journal Article, Electronic Publication
Fraunhofer IWM ()
magnetorheological fluids; discrete-element-method; magnetorheometer

Abstract
Particle-based simulations are a suitable tool to gain insight into the microstructural behavior of a magnetorheological fluid (MRF). For the application of MRF in clutches, the amount of torque transmission is a matter of particular interest. Concerning the contact between iron particles and clutch walls, several questions arise: Is a higher wall roughness beneficial for torque transmission? What is the influence of wall magnetism on torque transmission? What are the mechanisms on particle scale that lead to increased torque transmission? Inspired by a previous experimental study, we performed three-dimensional simulations based on the Discrete-Element-Method (DEM) with different wall roughnesses and different magnetic conditions to investigate the mechanisms of shear stress transmission at particle level. The simulations show that a higher wall roughness leads to higher torque transmission only in the case of non-magnetic walls. For ferromagnetic walls, no influence of wall roughness on torque transmission is observed. This is in qualitative agreement with the experimental results.

: http://publica.fraunhofer.de/documents/N-236438.html