Abstract/Details

Visualizing fluidized beds with X-rays


2008 2008

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Abstract (summary)

This study applies minimum fluidization velocity experiments, X-ray computed tomography (CT), X-ray stereography, and particle tracking to fluidized beds of glass beads, ground walnut shell, and ground corncob operating with a variety of flow conditions. 3-D local, time-averaged gas holdup is calculated from CT data, while dynamic features are captured by X-ray stereography. The results show that CT is most effective on glass bead fluidized beds. Due to high X-ray attenuation, glass bead CT data has higher resolution than walnut shell and corncob beds. Glass bead gas holdup data also feature the lowest noise due to the high homogeneity of the beads. Conversely, stereography is most effective in corncob and walnut shell fluidized beds. High X-ray penetration in these beds allows clear observation of internal flow features. It is also determined that increasing the superficial gas velocity in the bed decreases the effects of side air injection.

Indexing (details)


Subject
Mechanical engineering
Classification
0548: Mechanical engineering
Identifier / keyword
Applied sciences; Fluidized beds; Gas holdup; Minimum fluidization velocity; X-ray computed tomography; X-ray particle tracking; X-ray stereography
Title
Visualizing fluidized beds with X-rays
Author
Franka, Nathan Paul
Number of pages
271
Publication year
2008
Degree date
2008
School code
0097
Source
MAI 46/05M, Masters Abstracts International
Place of publication
Ann Arbor
Country of publication
United States
ISBN
9780549542964
Advisor
Heindel, Theodore J.
Committee member
Brown, Robert C.; Hu, Hui
University/institution
Iowa State University
Department
Mechanical Engineering
University location
United States -- Iowa
Degree
M.S.
Source type
Dissertations & Theses
Language
English
Document type
Dissertation/Thesis
Dissertation/thesis number
1453162
ProQuest document ID
304635770
Copyright
Database copyright ProQuest LLC; ProQuest does not claim copyright in the individual underlying works.
Document URL
http://search.proquest.com/docview/304635770
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