Guyez, Estelle Marie Chantal and Thomas, P. J. (Peter J.) (2008) Dynamics of band drift in particle-laden rimming flow. In: The 7th EUROMECH Fluid Mechanics Conference, University of Manchester, Manchester, U.K., Sep 14-18, 2008. Published in: EFMC7 Book of Abstracts p. 129.

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Abstract

In Refs. [1,2] we described a new pattern formation process associated with the flow inside a horizontal rotating cylinder that is partially filled with a particle-laden fluid. The pattern is observed to form as the particles segregate and agglomerate to form circumferential bands with high particle concentrations. Any two neighbouring granule bands are separated from one another by regions of liquid with low particle concentrations or, in some cases, regions entirely free of particles. A typical such pattern is shown in Fig. 1. Our most recent experiments [3] have revealed that the system can display an extremely rich, often highly symmetric, spatiotemporal behaviour that emerges over days or weeks as the patterns drift very slowly along the axis of rotation. A typical spatiotemporal plot is shown in Fig. 2. The plot was assembled by extracting pixel lines (see Fig. 1) from successive photos and composing these into a single figure. In Fig. 2 the presence of a band is identified in black whereas regions of low granule concentrations are represented in white. It can be seen that the bands drift from locations L>0 towards the cylinder end walls at L=0 cm and L=27 cm. For other experimental conditions bands can drift from the end walls towards the cylinder centre, they may display entirely irregular drift characteristics, or they may not drift at all. We discuss long-term observations of the system and focus on effects induced by a density difference between the particles and the ambient liquid. The key non-dimensional parameters governing the system are identified. It is found that a suitably defined Stokes number enables characterizing parameter regimes with drifting and stationary bands.

Item Type:	Conference Item (Speech)
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) T Technology > TJ Mechanical engineering and machinery
Divisions:	Faculty of Science > Engineering
Journal or Publication Title:	EFMC7 Book of Abstracts
Publisher:	European Mechanics Society
Date:	17 September 2008
Page Range:	p. 129
Status:	Not Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Open Access
Conference Paper Type:	Speech
Title of Event:	The 7th EUROMECH Fluid Mechanics Conference
Type of Event:	Conference
Location of Event:	University of Manchester, Manchester, U.K.
Date(s) of Event:	Sep 14-18, 2008
URI:	http://wrap.warwick.ac.uk/id/eprint/46760

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