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Received June 27, 2012
Accepted October 2, 2012
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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
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A model for estimating agglomerate sizes of non-magnetic nanoparticles in magnetic fluidized beds
1Key Laboratory of Resources Chemistry of Nonferrous Metals, Central South University, Changsha 410083, Hunan, China 2Department of Mechanical Engineering, Hunan Institute of Technology, Hengyang 421002, Hunan, China 3Department of Applied Chemistry, Kyushu Institute of Technology, 1-1 Sensui-cho, Tobata, Kitakyushu 804-8550, Japan
zhoutao@csu.edu.cn
Korean Journal of Chemical Engineering, February 2013, 30(2), 501-507(7), 10.1007/s11814-012-0170-5
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Abstract
The behavior of SiO2, TiO2 and ZnO non-magnetic nanoparticles and the effects of processing parameters on agglomerate sizes were investigated systematically in a magnetic fluidized bed (MFB) by adding coarse magnets. A mathematical model is developed based on energy balance among the agglomerate collision energy, magnetic energy, energy generated by turbulent shear and cohesive energy to predict the agglomerate sizes. The results showed that slugging of the bed disappeared and the measured agglomerate sizes decreased, so that the fluidization quality of non-magnetic nanoparticles was significantly improved by adding coarse magnets due to introduction of magnetic field. The average agglomerate sizes predicted by this model are in agreement with the experimental data.
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References
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Khan AR, Richardson JF, Chem. Eng. Sci., 45, 255 (1990)
Timoshenko SP, Goodier JN, McGraw-Hill, New York, 68 (1970)
