TY - GEN
T1 - Evaluation of a constitutive equation for magnetorheological fluids in shear and elongational flows
AU - Ciocanel, Constantin
AU - Lipscomb, Glenn
AU - Naganathan, Nagi G.
PY - 2005
Y1 - 2005
N2 - 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 and particle structure fields. 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. Additionally, 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.
AB - 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 and particle structure fields. 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. Additionally, 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.
KW - Constitutive equations
KW - Magnetorheological fluids
KW - Particle suspensions
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U2 - 10.1115/IMECE2005-79974
DO - 10.1115/IMECE2005-79974
M3 - Conference contribution
AN - SCOPUS:33645694030
SN - 079184210X
SN - 9780791842102
T3 - American Society of Mechanical Engineers, Aerospace Division (Publication) AD
SP - 101
EP - 109
BT - Proceedings of the ASME Aerospace Division 2005
T2 - 2005 ASME International Mechanical Engineering Congress and Exposition, IMECE 2005
Y2 - 5 November 2005 through 11 November 2005
ER -