Faculty Advisor

Koehler, Stephan A

Abstract

We studied the topography of a granular bed after dragging intruders, such as vertical posts, through an initially leveled surface using a stereographic camera. We studied the parameters R, the intruder radius, and Z, the immersion depth, in relation to surface displacements for slow moving intruders which were much larger than the particle size. The inclination angles of surfaces exceeded theta=35° in the trough behind the post, and were significantly greater than the angle of repose theta=24° of free standing piles. The mounds and their profiles were roughly geometrically similar, and increased in size with intruder radius R and immersion depth Z. The ratio of the mound volumes to immersed intruder volumes exhibited a roughly linear increase with the ratio Z/R.

Publisher

Worcester Polytechnic Institute

Date Accepted

May 2013

Major

Engineering Physics

Project Type

Major Qualifying Project

Accessibility

Unrestricted

Advisor Department

Physics

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