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On the stability of Poiseuille flow of a Bingham fluid

- I. Frigaard, S. Howison, I. Sobey
- Physics
- 25 March 1994

The stability to linearized two-dimensional disturbances of plane Poiseuille flow of a Bingham fluid is considered. Bingham fluids exhibit a yield stress in addition to a plastic viscosity and this… Expand

Yielding to Stress: Recent Developments in Viscoplastic Fluid Mechanics

- N. Balmforth, I. Frigaard, G. Ovarlez
- Geology
- 3 January 2014

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… Expand

On the usage of viscosity regularisation methods for visco-plastic fluid flow computation

- I. Frigaard, C. Nouar
- Mathematics
- 10 April 2005

Abstract Viscosity regularisation methods are probably the most popular current method for computing visco-plastic fluid flows. They are however generally used in an ad hoc manner. Here we examine… Expand

Propagation and stopping of air bubbles in Carbopol solutions

- N. Dubash, I. Frigaard
- Physics
- 16 March 2007

Abstract We present results of an experimental study of the motion of air bubbles rising in a column of Carbopol solution under gravity. In Dubash and Frigaard [N. Dubash, I.A. Frigaard, Conditions… Expand

Mud removal and cement placement during primary cementing of an oil well – Laminar non-Newtonian displacements in an eccentric annular Hele-Shaw cell

- S. Bittleston, J. Ferguson, I. Frigaard
- Geology
- 1 August 2002

A two-dimensional model is derived of the displacement flows that occur during primary cementing of oil and gas wells. The displacement geometry is a long narrow eccentric annulus, between the casing… Expand

Settling of an isolated spherical particle in a yield stress shear thinning fluid

- A. Putz, T. Burghelea, I. Frigaard, D. Martinez
- Physics
- 12 March 2008

We visualize the flow induced by an isolated non-Brownian spherical particle settling in a shear thinning yield stress fluid using particle image velocimetry. With Re<1, we show a breaking of the… Expand

Conditions for static bubbles in viscoplastic fluids

- N. Dubash, I. Frigaard
- Physics
- 21 October 2004

We consider the slow motion of a gas bubble in a cylindrical column filled with a viscoplastic fluid, modeled here as a Herschel–Bulkley fluid. Because of the yield stress of the fluid, it is… Expand

Creeping flow around particles in a Bingham fluid

- A. Putz, I. Frigaard
- Physics
- 1 March 2010

Abstract We revisit the variational setting of the creeping flow of Bingham fluid about a particle. We investigate two problems: the resistance and the mobility problem, which arise in the context of… Expand

On the lubrication paradox and the use of regularisation methods for lubrication flows

- A. Putz, I. Frigaard, D. Martinez
- Physics
- 1 November 2009

Abstract In this paper we complete the analysis of the flow of a Bingham fluid along a wavy-walled channel. We confirm numerically the results of [I. Frigaard, D. Ryan, Flow of a visco-plastic fluid… Expand

Super-stable parallel flows of multiple visco-plastic fluids

- I. Frigaard
- Materials Science
- 1 September 2001

Abstract We consider the stability of a multi-layer plane Poiseuille flow of two Bingham fluids. It is shown that this two-fluid flow is frequently more stable than the equivalent flow of either… Expand

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