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Title: Instrumentation to Monitor Transient Periodic Developing Flow in Non-Newtonian Slurries

Staff at Pacific Northwest National Laboratory have conducted mixing and mobilization experiments with non-Newtonian slurries that exhibit Bingham plastic and shear thinning behavior and shear strength. This paper describes measurement techniques applied to identify the interface between flowing and stationary regions of non-Newtonian slurries that are subjected to transient, periodic, developing flows. Techniques were developed to identify the boundary between the flowing and stationary regions, time to mix, characteristic velocities of the flow field produced by the symmetrically spaced nozzles, and the velocity of the upwell formed in the center of the tank by the intersection of flow from four symmetrically spaced nozzles that impinge upon the tank floor. Descriptions of the instruments and instrument performance are presented. These techniques were an effective approach to characterize mixing phenomena, determine mixing energy required to fully mobilize vessel contents and to determine mixing times for process evaluation.
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Conference: Proceedings of the ASME 2013 International Mechanical Engineering Congress & Exposition (IMECE2013 ), November 15-21, 2013, San Diego, California, 7B:Paper No. IMECE2013-65374
American Society of Mechanical Engineers, New York, NY, United States(US).
Research Org:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
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Country of Publication:
United States
Transient; Periodic Developing flow; Non-Newtonian Slurries