Campus Units
Mechanical Engineering, Chemical and Biological Engineering
Document Type
Conference Proceeding
Conference
2013 Fluids Engineering Division Summer Meeting
Publication Version
Published Version
Publication Date
2013
Journal or Book Title
Proceedings of the ASME 2013 Fluids Engineering Division Summer Meeting (FEDSM2013)
Volume
2
Issue
FEDSM2013-16054
First Page
V002T22A001
DOI
10.1115/FEDSM2013-16054
Conference Date
July 7–11, 2013
City
Incline Village, NV
Abstract
Characterizing the mixing effectiveness of systems or processes in granular applications is difficult due to ineffective sampling procedures and a lack of quantifiable measurement techniques. The mixing effectiveness of a screw pyrolyzer consisting of a binary mixture of 500–6350 μm red oak chips and 300–500 μm glass beads is evaluated using optical visualization and composition analysis techniques. The mass fraction of binary mixture samples is determined and the weighted sample variance from four outlet ports is used to evaluate the mixing effectiveness. The effect of dimensionless screw pitch on the mixing effectiveness is investigated at levels of p/D = 0.75, 1.25, and 1.75. Optical visualization is captured across the entire mixing region’s periphery allowing qualitative observations to be made, leading to the visual observation that increasing the dimensionless screw pitch increases the mixing effectiveness. Quantitative composition analysis utilizing a one-way analysis of variance (ANOVA) statistical model confirms that increasing the dimensionless screw pitch from 0.75 to 1.25 results in a significant increase in mixing effectiveness. However, diminishing increases in mixing effectiveness were shown as the dimensionless screw pitch increased from 1.25 to 1.75, and statistically these two conditions could not be distinguished given the amount of data in this study. Results are compared to previous granular mixing measurement techniques found in the literature, and similar results are reported.
Copyright Owner
ASME
Copyright Date
2013
Language
en
File Format
application/pdf
Recommended Citation
Kingston, Todd A. and Heindel, Theodore J., "Visualization and Composition Analysis to Quantify Mixing in a Screw Pyrolyzer" (2013). Mechanical Engineering Conference Presentations, Papers, and Proceedings. 182.
https://lib.dr.iastate.edu/me_conf/182
Comments
This proceeding is published as Kingston, T.A., and Heindel, T.J., “Visualization and Composition Analysis to Quantify Mixing in a Screw Pyrolyzer,” Proceedings of ASME 2013 Fluids Engineering Division Summer Meeting, July 7-11, 2013, Incline Village, Nevada, USA, Paper FEDSM2013-16054, 2013. DOI: 10.1115/FEDSM2013-16054. Posted with permission.