Orientation of cylindrical particles in a fluidized bed based on stereo X-ray particle tracking velocimetry (XPTV)

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Chen, Xi
Zhong, Wenqi
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Heindel, Theodore
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Mechanical Engineering
The Department of Mechanical Engineering at Iowa State University is where innovation thrives and the impossible is made possible. This is where your passion for problem-solving and hands-on learning can make a real difference in our world. Whether you’re helping improve the environment, creating safer automobiles, or advancing medical technologies, and athletic performance, the Department of Mechanical Engineering gives you the tools and talent to blaze your own trail to an amazing career.
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Chemical and Biological Engineering

The function of the Department of Chemical and Biological Engineering has been to prepare students for the study and application of chemistry in industry. This focus has included preparation for employment in various industries as well as the development, design, and operation of equipment and processes within industry.Through the CBE Department, Iowa State University is nationally recognized for its initiatives in bioinformatics, biomaterials, bioproducts, metabolic/tissue engineering, multiphase computational fluid dynamics, advanced polymeric materials and nanostructured materials.

The Department of Chemical Engineering was founded in 1913 under the Department of Physics and Illuminating Engineering. From 1915 to 1931 it was jointly administered by the Divisions of Industrial Science and Engineering, and from 1931 onward it has been under the Division/College of Engineering. In 1928 it merged with Mining Engineering, and from 1973–1979 it merged with Nuclear Engineering. It became Chemical and Biological Engineering in 2005.

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1913 - present

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  • Department of Chemical Engineering (1913–1928)
  • Department of Chemical and Mining Engineering (1928–1957)
  • Department of Chemical Engineering (1957–1973, 1979–2005)
    • Department of Chemical and Biological Engineering (2005–present)

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Fluidization of non-spherical particles commonly exists in the biomass utilization and municipal solid waste (MSW) processing industries. In this study, cylindrical particles are used as a typical type of non-spherical particle and its orientation distribution is investigated when being co-fluidized with small spherical bed material. X-ray particle tracking velocimetry (XPTV), based on an X-ray stereography imaging system, is used to measure the 3D orientation of a single tracer particle over a long time period in the fluidized bed. The effects of gas velocity (uf), cylindrical particle mass fraction (ω), particle sphericity (Φ), and bed material size on the orientation distribution of the cylindrical particle are investigated and discussed in detail. An orientation distribution probability density function (PDF) model is proposed based on all experimental results.

The distribution probability P of the angle between the cylindrical particle central axis and vertical direction λ across the bed shows two minima in the ranges 0° ≤ λ < 10° and 40° ≤ λ < 50°, and two maxima in the ranges 20° ≤ λ < 30° and 70° ≤ λ < 80°. Increasing uf reduces λ, while the effect of particle sphericity Φ and cylindrical particle mass fraction ω increases with increasing uf.


This is a manuscript of an article published as Chen, Xi, Wenqi Zhong, and Theodore J. Heindel. "Orientation of cylindrical particles in a fluidized bed based on stereo X-ray particle tracking velocimetry (XPTV)." Chemical Engineering Science 203 (2019): 104-112. DOI: 10.1016/j.ces.2019.03.067. Posted with permission.

Tue Jan 01 00:00:00 UTC 2019