In-Situ and Image-Based Force Measurement for a Steady Dry Granular Flow Over an Obstacle
Date Issued
2012
Date
2012
Author(s)
Jiang, Ming-Jhe
Abstract
This work attempts direct and indirect measurements for the force developed by a steady dry granular flow down an incline as it impinges and runs over an obstacle constructed by putting together two load cells and one shear cell. Three load cells were implemented to achieve in-situ measurements of the impact force, the tangential friction, and the overhead normal loads. High-speed imaging technique and relevant image analysis were employed to estimate depth profiles of the flow density and velocity which information were further integrated into a two-dimensional control
volume analysis to estimate the corresponding force components using the requirement of streamwise momentum conservation. The force data obtained from the
3D in-situ and 2D indirect measurements agree well over the inspected inclination angles, 23 and 26 degrees, provided that the flow is not too loose or too thin for which
erroneous PTV is inevitable. In addition, we also discover unique temporal profiles for reservoir discharge and explanations are given based on relevant high-speed
imaging analysis.
Subjects
steady dry granular flow
in-situ measurements
Particle Tracking Velocimetry
Type
thesis
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