SUSPENSION RHEOLOGY
1972; Elsevier BV; Linguagem: Inglês
10.1016/b978-0-08-016915-6.50012-4
Autores Tópico(s)Polymer Nanocomposites and Properties
ResumoRecent dynamical theories of the rheological properties of dilute suspensions composed of particles dispersed in a Newtonian liquid are reviewed. In deducing the statistical-mechanical behavior of such systems, one proceeds from the detailed kinematical and dynamical laws (and boundary conditions) governing the motion of the interstitial fluid and the individual particles, to knowledge of the macroscopic kinematical and dynamical laws governing the bulk properties of the suspension as a whole—viewed as a heterogeneous continuum with internal degrees of freedom. Topics discussed include the rheology of dilute dispersions of rigid spherical and nonspherical particles in simple shear and extensional flows, and the effects upon such systems of rotary Brownian motion, particle-particle interactions, particle deformability—including compressibility, time-dependent flows, and inertial effects. Antisymmetric stresses resulting from the interaction between external fields and any permanent "dipolar" inhomogeneities present in the individual particles are also examined. Detailed theories of this nature yield both explicit rheological constitutive laws and explicit expressions for the phenomenological coefficients appearing therein, in terms of the basic parameters characterizing the separate phases. The a priori consistency of these constitutive laws with general continuum-mechanical principles is pointed out.
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