The archetypal feature of a viscoplastic fluid is its yield stress: If the material is not sufficiently
stressed, it behaves like a solid, but once the yield stress is exceeded, the material flows like …

Recent years have seen a flurry of research on yield stress fluids, approached from different
perspectives (physicochemical, rheological and fluid mechanical), considering different …

The linear stability characteristics of pressure-driven core-annular flow of a Newtonian core
fluid and a Herschel–Bulkley annular fluid is investigated. The fluids are assumed to have …

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 present results of a computational study of visco-plastically lubricated plane channel
multi-layer flows, in which the yield stress fluid layers are unyielded at the interface. We …

Viscoplastic fluids do not flow unless they are sufficiently stressed. This property can be
exploited in order to produce novel flow features. One example of such flows is …

We consider lubrication theory for a two-dimensional viscoplastic fluid confined between
rigid moving boundaries. A general formulation is presented which allows the flow field and …

An annular flume combined with a microscopic system is used to explore local erosion
mechanisms of transparent cohesive beds (yield stress fluids) under shear-induced flowing …

A core-annular flow of an Oldroyd-B fluid surrounded by a lubricating Bingham fluid is
studied using energy stability methods. We consider base flows for which the lubricating …

Visco-plastic lubrication (VPL) has been established as a method for reliably suppressing
interfacial instabilities and enhancing flow stability for multi-layer systems. Here we extend …