Viscoelastic instabilities are of practical importance, and are the subject of growing interest.
Reviewed here are the fresh developments as well as earlier work in this area, organized …

A review of the different coextrusion processes and the related processing problems is
presented. A one-dimensional bilayer coextrusion Poiseuille flow model is first developed …

Two-fluid dynamics is a challenging subject rich in physics and prac tical applications. Many
of the most interesting problems are tied to the loss of stability which is realized in …

Two-fluid dynamics is a challenging subject rich in physics and prac tical applications. Many
of the most interesting problems are tied to the loss of stability which is realized in …

Model experiments were performed to determine the controlling parameters in the evolution
of the phase morphology of immiscible polymer blends from pellets to micrometre-sized …

The stability of the interface between a gel of thickness HR and a Newtonian fluid of
thickness R subjected to a linear shear flow is studied in the limit where inertial effects are …

An experimental study was carried out to investigate the existence of a critical layer
thickness in nanolayer coextrusion, under which no continuous layer is observed. Polymer …

Chen has recently shown (J. Non-Newtonian Fluid Mech., 40 (1991) 155-175) that a jump in
the first normal stress difference between two elastic fluids in core-annular flow leads to a …

The capillary instability that occurs on an annular film lining a tube is studied as a model of
airway closure. Small waves in the film can amplify and form a plug across the tube. This …

The stability of Hagen-Poiseuille flow of a Newtonian fluid of viscosity η in a tube of radius R
surrounded by a viscoelastic medium of elasticity G and viscosity ηs occupying the annulus …