During flow, an initially homogeneous polymer solution may develop position-dependent
concentration gradients due to migration of the polymer molecules with respect to the bulk …

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 …

The study of complex flows raises many issues of general interest to the mathematician
including, for instance, questions of asymptotic description of the high Weissenberg number …

The continually growing plastics market consists of more than 250 million tons of product
annually, making the recurring problem of polymer melt fracture an acute issue in the …

Purely viscous and purely elastic interfacial instabilities as well as the layer encapsulation
phenomena in superposed pressure-driven channel flow of well characterized Newtonian …

Swelling is the process of volume expansion, usually brought about by the intake of water.
One mechanism by which water can be drawn into a material is if the material has less water …

We give an experimental demonstration that stable core-annular flows can be achieved
when lubricating a viscoelastic core fluid with a yield stress fluid. We use Carbopol as the …

We study the stability of pressure-driven channel flow of a thixotropic-viscoelasto-plastic
fluid. Several recent experiments have shown that channel flows of shear-thinning polymer …

Abstract The Johnson-Segalman model is an example of a model that exhibits a
nonmonotone curve for the shear stress in terms of shear rate. There are many works based …