This review highlights the profound and unexpected ways in which viscosity varying in
space and time can affect flow. The most striking manifestations are through alterations of …

The effect of viscoelasticity on the deformation of a circular drop suspended in a second
liquid in shear is investigated with direct numerical simulations. A numerical algorithm based …

We propose a novel device capable of measuring relaxation times of viscoelastic fluids as
small as 1 ms. In contrast to most rheometers, which by their very nature are concerned with …

We discuss the formation, evolution, and stability of microfluidic flows involving two or more
miscible fluids that have different viscosities. When two liquids that have widely different …

Multilayer coextrusion is a process in which polymers are extruded and joined together in a
feedblock or die to form a single structure with multiple layers. These layers normally should …

We introduce a sharp interface method (SIM) for the direct numerical simulation of unstable
fluid–fluid interfaces. The method is based on the level set approach and the structured …

Micro-capillary liquid-liquid Taylor flows have emerged as a promising new platform for
achieving higher heat and mass transfer compared to single-phase flows. In any application …

We report the first multiplexed microfluidic viscometer capable of measuring simultaneously
the viscosity as a function of shear rate for multiple samples. The viscometer is based on a …

We experimentally investigate the flow structures formed when two miscible fluids that have
large viscosity contrasts are injected and hydrodynamically focused in plane microchannels …

The interface instability of the coextrusion flow of a polyethylene and a polystyrene is studied
both experimentally and theoretically in a slit geometry. For prototype industrial conditions …