Internal Imaging Measurement of Immersed Granular Flows in a Rotating Drum
Date Issued
2010
Date
2010
Author(s)
Tai, Yung-Hui
Abstract
In this thesis, immersed granular avalanches in a rotating drum are studied experimentally using particle tracking velocimetry (PTV). To observe internal motions, refractive index matched solid and liquid materials are used. A laser light sheet is then used to illuminate slices through the flow. Two-dimensional motions of both solid and liquid motions in the center plane are measured using a stationary laser light sheet. We then seek to measure the full three-dimensional positions and velocities of the solid grains by scanning the flow volume using a rotating light sheet. Fast scans are obtained using a special rotating mirror device, and calibrated in 3D using a trilinear coordinate transformation. The effect of varying the drum rotation rate is examined. Measurements in 2D and 3D are obtained for avalanches of 1500 spherical grains.
Subjects
rotating drum
immersed granular avalanches
a special rotating mirror device
trilinear coordinate transformation
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