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J A Pathak

Publications and source records attributed to J A Pathak.

3 recordsLinked to original sources
PubMed2004

Ubiquity of domain patterns in sheared viscoelastic fluids.

A ubiquitous domain pattern is observed in two-phase viscoelastic fluids falling within the simple paradigm of soft viscoelastic domains suspended in a less viscoelastic fluid under shear flow. Three strikingly different complex fluids exhibit the same shear-induced domain structure, which we relate to the elasticity of the dispersed phase via an approximate Weissenberg number. We suggest a physical mechanism for the formation of this pervasive pattern, independent of the dynamic origin of the elasticity of the suspended phase.

Journal Article↗
PubMed2004

Elastic flow instability in nanotube suspensions.

We report an elastic instability associated with flow-induced clustering in semidilute non-Brownian colloidal nanotubes. Rheo-optical measurements are compared with simulations of mechanical flocculation in sheared fiber suspensions, and the evolving structure is characterized as a function of confinement and shear stress. The transient rheology is correlated with the evolution of highly elastic vorticity-aligned aggregates, with the underlying instability being somewhat ubiquitous in complex fluids.

Journal Article↗