scholarly journals Light Scattering Studies of an Electrorheological Fluid in Oscillatory Shear

1994 ◽  
Vol 366 ◽  
Author(s):  
James E. Martin ◽  
Judy Odinek
Keyword(s):  
Light Scattering ◽  
Electrorheological Fluid ◽  
Theoretical Description ◽  
Structural Theory ◽  
Oscillatory Shear ◽  
Two Dimensional ◽  
Nonlinear Rheology ◽  
Particle Chain ◽  
Scattering Study ◽  
Er Fluids

ABSTRACTWe have conducted a real time, two-dimensional light scattering study of the nonlinear dynamics of field-induced structures in an electrorheological fluid subjected to oscillatory shear. We have developed a theoretical description of the observed dynamics by considering the response of a fragmenting/aggregating particle chain to the prevailing hydrodynamic and electrostatic forces. This structural theory is then used to describe the nonlinear rheology of ER fluids.

scholarly journals LIGHT SCATTERING STUDIES OF AN ELECTRORHEOLOGICAL FLUID IN OSCILLATORY SHEAR

1996 ◽  
Vol 10 (23n24) ◽  
pp. 3257-3266 ◽  
Author(s):  
JAMES E. MARTIN ◽  
JUDY ODINEK
Keyword(s):  
Light Scattering ◽  
Electrorheological Fluid ◽  
Structural Theory ◽  
Oscillatory Shear ◽  
Chain Model ◽  
Kinetic Chain ◽  
Nonlinear Rheology ◽  
Particle Chain ◽  
Scattering Study ◽  
Er Fluids

We have conducted a real time, two-dimensional light scattering study of the nonlinear dynamics of field-induced structures in an electrorheological fluid subjected to oscillatory shear. We have developed a kinetic chain model of the observed dynamics by considering the response of a fragmenting/aggregating particle chain to the prevailing hydrodynamic and electrostatic forces. This structural theory is then used to describe the nonlinear rheology of ER fluids.

scholarly journals Coarsening of a Quiescent Electrorheological Fluid I: Experiment

1992 ◽  
Vol 289 ◽  
Author(s):  
James E. Martin ◽  
Judy Odinek ◽  
Thomas C. Halsey
Keyword(s):  
Light Scattering ◽  
Solid Phase ◽  
Electrorheological Fluid ◽  
Two Dimensional ◽  
Strong Light ◽  
Scattering Study ◽  
Evolution Of Structure ◽  
Field Lines ◽  
Particle Chaining ◽  
Kinetics Of

AbstractWe report a real-time, two-dimensional light scattering study of the evolution of structure in a concentrated electrorheological fluid during the ‘liquid-solid’ phase transition. We find that after particle chaining along the electric field lines, strong light scattering lobes appear at a finite scattering wavevector q orthogonal to the field lines, and then brighten as they move to q=0. This indicates the existence of an unstable concentration fluctuation that signifies the segregation of chains into columns. In fact, the observed growth kinetics of the characteristic length, as well as the form of the structure factor, are qualitatively similar to two-dimensional spinodal decomposition in a system with a conserved order parameter.

FLUID FLOW AND FALLING BALL EXPERIMENTS IN ER FLUIDS

1994 ◽  
Vol 08 (20n21) ◽  
pp. 2823-2833 ◽  
Author(s):  
R. N. ZITTER ◽  
T. J. CHEN ◽  
X. ZHANG ◽  
R. TAO
Keyword(s):  
Fluid Flow ◽  
Electric Fields ◽  
Electrorheological Fluid ◽  
Dipole Model ◽  
Particle Sizes ◽  
Constant Flow Rate ◽  
Particle Chain ◽  
Induced Dipole ◽  
Series Of Experiments ◽  
Er Fluids

The ability of the induced dipole–dipole model to predict various properties of an electrorheological fluid is tested in a series of experiments: the deformation of a single particle chain under fluid flow, the velocity of a falling ball at various electric fields, particle sizes, and concentrations, and flow valves operating at either constant pressure differential or constant flow rate. Analyses of these rather different experimental situations show that with proper application, the induced dipole model can give a fairly accurate description of observed characteristics.

Phase transitions in C2O4HNH4, 1/2 H2O. A light scattering study at normal pressure

1987 ◽  
Vol 48 (5) ◽  
pp. 809-819 ◽  
Author(s):  
J.L. Godet ◽  
M. Krauzman ◽  
J.P. Mathieu ◽  
H. Poulet ◽  
N. Toupry
Keyword(s):  
Phase Transitions ◽  
Light Scattering ◽  
Normal Pressure ◽  
Scattering Study

scholarly journals Assembly of fibrin. A light scattering study.

1979 ◽  
Vol 254 (22) ◽  
pp. 11272-11281
Author(s):  
R.R. Hantgan ◽  
J. Hermans
Keyword(s):  
Light Scattering ◽  
Scattering Study
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