Sphere’s incipient rocking on an aerodynamically rough bed surface

Xiao-Hu, Z., Valyrakis, M. and Zhen-Shan, L. (2018) Sphere’s incipient rocking on an aerodynamically rough bed surface. In: Driss, Z., Necib, B. and Zhang, H.-C. (eds.) Thermo-Mechanics Applications and Engineering Technology. Springer: Cham, pp. 135-149. ISBN 9783319709567 (doi: 10.1007/978-3-319-70957-4_6)

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Particle entrainment due to air at low mobility conditions is important in a range of processes relevant to applied research themes ranging from aeolian sediment transport mechanics to particle technology (e.g. pneumatic transport). Until re-cently, challenges in accurately measuring particle displacement have hindered progress in identifying the relevant mechanisms responsible for this. In this study, the design of appropriate particle transport experiments in a wind tunnel and measurements of angular displacement of an exposed particle resting on a flat, aerodynamically roughened bed surface. Specifically, the minute displacements (rocking) to full dislodgement events (rolling) of the particle are detected by a high resolution laser distance sensor (LDS). Displacement statistics based on pa-rameters such as variation, frequency, duration, amplitude, time between dis-placements are investigated and discussed. These results suggest that rocking and rolling of particles can be separated by an angular threshold position, equal rough-ly to 0.41π. Following this statistical framework to establish such a threshold pa-rameter for a wider range of particle features is useful for the determination of the conditions under which transport at low mobility rates occurs.

Item Type:Book Sections
Glasgow Author(s) Enlighten ID:Valyrakis, Dr Manousos
Authors: Xiao-Hu, Z., Valyrakis, M., and Zhen-Shan, L.
College/School:College of Science and Engineering > School of Engineering > Infrastructure and Environment
Published Online:01 February 2018

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