University of Twente Student Theses


Collapse of a sand bed

Gjaltema, C. (2013) Collapse of a sand bed.

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Abstract:Granular materials are widely used in industrial processes and the lack of understanding of the physics, specific for the behaviour of granular materials, makes it difficult, for example, to effectively design industrial facilities. This thesis takes a closer look at the behaviour of the compaction of a sand bed under different conditions; namely different ambient pressures and different shock strengths. This shock is achieved by releasing a ball from a specific distance and letting it swing against the side of a container filled with loosely packed sand. The pressure difference above and below the sand and the drop of the sand bed were measured, and the maximum pressure reached during the experiments together with the behaviour of the decay of the pressure were analysed. The data shows that the compaction of the sand is very dependent on the release distance of the ball and thus the shock strength; the compaction is larger for larger deviations of the ball. Surprisingly it also depends on the ambient pressure inside the container, but to a lesser extent. It can be concluded that the compaction of the sand bed level both depends on the deviation of the ball and the ambient pressure inside the container.
Item Type:Essay (Bachelor)
Faculty:TNW: Science and Technology
Subject:33 physics
Programme:Applied Physics BSc (56962)
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