Hydrodynamic behavior of magnetized fluidized beds with admixtures of Geldart-B magnetizable and nonmagnetizable particles |
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| Affiliation: | 1. State Key Laboratory of Multi-phase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, P.O. Box 353, Beijing 100190, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;1. Department of Biosystems Engineering, Ferdowsi University of Mashhad, Iran;2. Department of Mathematical Sciences, Isfahan University of Technology, Isfahan, Iran;1. AOM-Systems GmbH, Flughafenstrasse 15, 64347 Griesheim, Germany;2. LacTec GmbH, Otto-Hahn-Strasse 6-8, 63110 Rodgau, Germany;3. Institute of Fluid Mechanics and Aerodynamics, Technische Universität Darmstadt, Alarich-Weiss-Strasse 10, 64287 Darmstadt, Germany;4. Graduate School of Computational Engineering, Technische Universität Darmstadt, Dolivostrasse 15, 64287 Darmstadt, Germany;1. Department of Biosystems and Agricultural Engineering, Michigan State University, East Lansing, MI 48824, USA;2. United States Department of Agriculture Agricultural Research Service, Michigan State University, East Lansing, MI 48824, USA;1. Beijing Research Center of Intelligent Equipment for Agriculture, Beijing 100097, China;2. National Research Center of Intelligent Equipment for Agriculture, Beijing 100097, China;3. Beijing Key Laboratory of Intelligent Equipment Technology for Agriculture, Beijing 100097, China;1. Beijing Research Center of Intelligent Equipment for Agriculture, Beijing, China;2. School of Electrical and Computer Engineering, College of Engineering, University of Georgia, Athens Georgia, United States |
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| Abstract: | This work focuses on the hydrodynamic behavior of admixtures of Geldart-B magnetizable and nonmagnetizable particles in a magnetized fluidized bed. The applied magnetic field was axial, uniform, and steady. In operating the beds, the magnetization-LAST mode was adopted under which four distinct flow regimes exist: fixed, magnetized-bubbling, partial segregation-bubbling, and total segregation-bubbling. The operational phase diagram was drawn to display the transitions between flow regimes in an intuitive manner. Only in the magnetized-bubbling regime could the magnetic field reduce the bubble size and improve fluidization quality. In the segregation-bubbling regimes, fluidization quality deteriorated as segregation developed. The segregation of the binary mixture was quantitatively studied by observing pressure drops in the local bed. Reasons for the improvement in fluidization quality as well as the occurrence of segregation were analyzed. Furthermore, the flow regime transition under magnetization-LAST operation mode was different from that under magnetization-FIRST mode. The magnetically stabilized bed (MSB) flow regime, which could be easily created under magnetization-FIRST mode, could no longer be achieved under magnetization-LAST mode. With the admixture, the MSB was proved to be a metastable equilibrium state. Under the magnetization-LAST mode, the admixture bed reached directly the stable equilibrium state—bubbling with segregation. |
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| Keywords: | Magnetized fluidized bed Admixture Magnetization-LAST Flow regime Hydrodynamic Segregation |
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