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Lookup NU author(s): Dr Francisco KisukaORCiD, Dr Colin HareORCiD
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License (CC BY-NC 4.0).
© 2023 University of Surrey. AIChE Journal published by Wiley Periodicals LLC on behalf of American Institute of Chemical Engineers. Bladed mixers are commonly used for processing granular materials, requiring significant mechanical energy for optimal blending. During this process, heat is generated due to dissipated mechanical energy within the granular medium. However, our understanding of heat generation mechanisms without external thermal loads is limited. This article investigates heat generation by monitoring temperature changes in granular beds mixed using an overhead stirrer. First-order kinetic equations are employed to extrapolate experimental data to a thermal equilibrium where heat generation and loss rates are balanced. Lead, steel, and glass particles are utilized under different operating conditions. Notably, metallic particles exhibit faster heating due to their lower heat capacity. Increasing rotation speed, fill ratio, and particle size result in greater temperature rises. Additionally, flat blades generate more heat compared to tilted blades. Through dimensional analysis, the experimental data are collapsed into linear curves that correlate system power consumption and granular bed temperature with operating conditions.
Author(s): Kisuka F, Rangel RL, Hare C, Vivacqua V, Wu C-Y
Publication type: Article
Publication status: Published
Journal: AIChE Journal
Year: 2023
Volume: 69
Issue: 12
Print publication date: 01/12/2023
Online publication date: 28/08/2023
Acceptance date: 25/07/2023
Date deposited: 13/06/2024
ISSN (print): 0001-1541
ISSN (electronic): 1547-5905
Publisher: John Wiley and Sons Inc.
URL: https://doi.org/10.1002/aic.18219
DOI: 10.1002/aic.18219
Data Access Statement: The numerical experimental data for Figures 5–12 related to Case No. 1–6 are included as Appendix S1 for each case number, as highlighted in Table 2. The fitting parameters used in Equation (4) for Cases No. 1–6 are also given in the Appendix S2. The video data for particle dynamics for representative cases No. 2 and 6 are also added as Appendix S1. The two cases are selected to demonstrate the particle motion that appears to be slow at the bottom and faster at the top of the container. Such information could not be captured in the images in Figure 3.
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