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Rapid Decompression of Dense Particle Beds

Abstract Rapid expansion of dense beds of fine, spherical particles subjected to rapid depressurization is studied in a vertical shock tube. As the particle bed is unloaded, a high-speed video camera captures the dramatic evolution of the particle bed structure. Pressure transducers are used to measure the dynamic pressure changes during the particle bed expansion process. Image processing, signal processing, and Particle Image Velocimetry techniques, are used to examine the relationships between particle size, initial bed height, bed expansion rate, and gas velocities.

The gas-particle interface and the particle bed as a whole expand and evolve in stages. First, the bed swells nearly homogeneously for a very brief period of time (< 2ms). Shortl... (more)
Created Date 2019
Contributor Zunino, Heather (Author) / Adrian, Ronald J (Advisor) / Clarke, Amanda (Committee member) / Chen, Kangping (Committee member) / Herrmann, Marcus (Committee member) / Huang, Huei-Ping (Committee member) / Arizona State University (Publisher)
Subject Fluid mechanics / Physics / Mechanical engineering / Compressible / Granular / Multiphase / Particle Image Velocimetry / Shocktube / Volcanology
Type Doctoral Dissertation
Extent 200 pages
Language English
Note Doctoral Dissertation Engineering 2019
Collaborating Institutions Graduate College / ASU Library
Additional Formats MODS / OAI Dublin Core / RIS

  Full Text
36.8 MB application/pdf
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Description Dissertation/Thesis
21.2 MB video/x-msvideo
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Description Rapid expansion of bed composed of [212, 297]micron particles.
25.5 MB video/x-msvideo
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Description Rapid expansion of bed composed of [44, 90]micron particles.
25.5 MB video/x-msvideo
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Description Rapid expansion of bed composed of [150, 212]micron particles.