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PRODID:-//AT Content Types//AT Event//EN
VERSION:1.0
BEGIN:VEVENT
DTSTART:20090309T140000Z
DTEND:20090309T150000Z
DCREATED:20090225T152914Z
UID:ATEvent-0cb5482e0e488e5b8add1b9530f7899d
SEQUENCE:0
LAST-MODIFIED:20090309T090843Z
SUMMARY:Anatoli Stulov\, Magneto-optical tomography of Cosserat flows
DESCRIPTION:Magneto-optical tomography is a nondestructive method for 
 the three-dimensional stress analysis in transparent specimens. It is 
 based on the measurement of the change in the polarization of light pa
 ssed through a birefringent medium. The sample under study is placed i
 n a strong constant magnetic field and illuminated in the direction pa
 rallel to this field. The plane of polarization of a light beam transm
 itted through the sample acquires an additional rotation\, caused by t
 he Faraday effect. The flow birefringence phenomenon in liquid is caus
 ed by presence of oblong molecules (polymers) or extended colloidal pa
 rticles. The particles at rest have both an isotropic and homogeneous 
 distribution\, and therefore the liquid is also optically isotropic. T
 he flow causes orientation of particles along the current lines\, and 
 this fact creates the induced birefringence. In case of the solution t
 hat contains polymeric chains\, the flow besides orientation of molecu
 les causes their extension and untwisting along the current lines. The
  reconstruction algorithm is based on the nonlinear effect of the magn
 etic field and flow birefringence on the parameters of polarized light
 \, and uses the exponential Radon transform of an imaginary parameter.
  The theories of flow birefringence consist of three groups\, which ar
 e applied to different classes of Cosserat fluids\, namely plastic flo
 ws (Neiman’s law\, Filon–Jessop law\, Doyle law)\, polymeric flows
  (Waylands’s theory for non- Newtonian fluids)\, and colloidal suspe
 nsions. Numerous nonlinear constitutive models (Giesekus\, Phan-Thien-
 Tanner) may be identified for simulation of generalized continua flow.
  Different types of microstructure give different types of the stress-
 optical rules\, rheological characteristics\, and constitutive equatio
 ns. It is shown that the magneto-optical methods permit\, in principle
 \, to apply tomographic techniques for reconstruction of the strain an
 d stress tensor fields of Cosserat flow.
LOCATION:B101
PRIORITY:3
TRANSP:0
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