Edward W Llewellin

Learn More
We present data for the rheology of suspensions of monodisperse particles of varying aspect ratio, from oblate to prolate, and covering particle volume fractions φ from dilute to highly concentrated. Rheology is characterized by fitting the experimental data to the model of Herschel & Bulkley (Herschel & Bulkley 1926 Kolloid Z. 39, 291–300(More)
1359-835X/$ see front matter 2009 Elsevier Ltd. doi:10.1016/j.compositesa.2009.04.009 * Corresponding author. Tel.: +1 506 452 6128; fax E-mail address: a.nabovati@unb.ca (A. Nabovati). Fluid flow analyses for porous media are of great importance in a wide range of industrial applications including, but not limited to, resin transfer moulding, filter(More)
[1] A generalized constitutive equation for bubbly liquids is presented which successfully reproduces the expected viscosity response for both steady flows with varying capillary number Ca (a measure of the bubble deformation) and unsteady flows with varying dynamic capillary number Cd (a measure of the steadiness of the flow) previously given in separate(More)
We conduct experiments to investigate the sintering of high-viscosity liquid droplets. Free-standing cylinders of spherical glass beads are heated above their glass transition temperature, causing them to densify under surface tension. We determine the evolving volume of the bead pack at high spatial and temporal resolution. We use these data to test a(More)
We present the results of laboratory experiments that quantify the physical controls on the thickness of the falling film of liquid around a Taylor bubble, when liquid–gas interfacial tension can be neglected. We find that the dimensionless film thickness l′ (the ratio of the film thickness to the pipe radius) is a function only of the dimensionless(More)
We develop a model for the rheology of a three-phase suspension of bubbles and particles in a Newtonian liquid undergoing steady flow. We adopt an 'effective-medium' approach in which the bubbly liquid is treated as a continuous medium which suspends the particles. The resulting three-phase model combines separate two-phase models for bubble suspension(More)
Department of Earth Sciences, Durham University, South Road, Durham DH1 3LE, UK, Institute of Hazard, Risk and Resilience, Durham University, South Road, Durham DH1 3LE, UK, Department of Earth and Environmental Sciences, Ludwig-Maximilians-Universität München, Munich 80333, Germany, Camborne School of Mines, College of Engineering, Mathematics and Physical(More)
Sintering-or coalescence-of compacts of viscous droplets is driven by the interfacial tension between the droplets and the interstitial gas phase. The process, which occurs in a range of industrial and natural settings, such as the manufacture of ceramics and the welding of volcanic ash, causes the compact to densify, to become stronger, and to become less(More)