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Determining the Mohr-Coulomb model parameters to examine the flowability of ground corn stover and douglas fir

Author
Li, Yang
Published
[University Park, Pennsylvania] : Pennsylvania State University, 2020.
Physical Description
1 electronic document
Additional Creators
Yi, Hojae and Schreyer Honors College
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Open Access.
Summary
As realizing sustainable energy production and consumption is one of the main goals of the biological industry, corn stover, and Douglas fir are widely used biomass sources in biorefineries to produce fertilizers and fuels. Small particles of these materials cause flow problems in the processing and handling systems since the experiment procedures and existing mathematical models of bulk solids failed to predict the biomass behaviors. In this research, hydrostatic triaxial compression (HTC) tests and conventional triaxial compression (CTC) tests were used to measure the physical and mechanical properties of bulk solids. Materials with different moisture contents (10, 25, and 50%) were tested by using a Multipycnometer and the Cubical Triaxial Tester under 100 kPa isotropic pressure. Increased moisture content lowered the flowability of materials via decreasing particle density, increasing internal friction angle and cohesion, and changing other mechanical properties. The Mohr-Coulomb model and the Cam-Clay model were applied to predict the flowing behaviors of bulk solids. The Mohr-Coulomb model provided useful information about the plastic deformation of bulk solids under compaction but lacked information after the failures of materials. The Cam-Clay model complemented the behavior patterns after failures but was limited to predict the behaviors of stiff and densified materials. In summary, the Cubical Triaxial Tester was successfully used in determining parameters of well-established constitutive models, which could predict the bulk flow behavior of ground biomass at different moisture contents. The experimental and analysis procedures presented in this study are expected to be used in engineering effective and reliable biomass handling equipment design and operations.
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Dissertation Note
B.S. Pennsylvania State University 2020.
Technical Details
The full text of the dissertation is available as an Adobe Acrobat .pdf file ; Adobe Acrobat Reader required to view the file.
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