Experimental study on fluidization of nanoparticle agglomerates with the assistance of vibration

doi:10.7523/j.issn.2095-6134.2020.02.009

Abstract

Abstract: The fluidization characteristics of SiO₂, Al₂O₃, and TiO₂ nanoparticles with the assistance of vibration at different frequencies and amplitudes are studied in a plexiglass fluidized bed with the inner diameter of 40 mm. The effects of vibration on fluidization of nanoparticles with different cohesiveness are compared. The results show that, without vibration, the SiO₂ nanoparticle agglomerates are fluidized smoothly while the Al₂O₃ and TiO₂ nanoparticle agglomerates are fluidized with segregation because there are large agglomerates at the bottom of the fluidized bed. When the vibration is introduced, the minimum fluidization velocity of SiO₂ decreases,and the bed expansion ratio of SiO₂ decreases with the increase of amplitude and frequency. For the Al₂O₃ and TiO₂ nanoparticles, as the amplitude and frequency increase, the minimum fluidization velocity decreases, the bed expansion ratio increases, and the agglomerate size decreases at the bottom of the fluidized bed. However, the vibration makes no significant improvement in fluidization at low frequency and low amplitude for the Al₂O₃ and TiO₂ nanoparticles. Vibration enhances the collision of nanoparticle agglomerates and has the dual effect of promoting the breakage and compaction of the agglomerates. The optimal vibration parameters need to be explored to achieve the optimal fluidization quality of different nanoparticles.

Key words: nanoparticles, agglomerates, fluidization characteristic, vibration

CLC Number:

TQ021

ZHAO Zhiduan, LIU Daoyin, MA Jiliang, CHEN Xiaoping. Experimental study on fluidization of nanoparticle agglomerates with the assistance of vibration[J]. , 2020, 37(2): 204-209.

References

[1] 陈敬中, 刘剑洪, 孙学良. 纳米材料科学导论[M]. 北京:高等教育出版社, 2010.
[2] Geldart D. Types of gas fluidization[J]. Powder Technology, 1973,7(5):285-292.
[3] Ommen J R V, Valverde J M, Pfeffer R. Fluidization of nanopowders:a review[J]. Journal of Nanoparticle Research, 2012,14(3):737.
[4] 王垚, 金涌, 魏飞. 纳米级SiO₂聚团散式流化中聚团参数及曳力系数[J]. 清华大学学报(自然科学版), 2001,41(4/5):32-35.
[5] 王垚, 金涌, 魏飞, 等. 纳米级SiO₂颗粒流化床的塌落行为[J]. 化工学报, 2001, 52(11):957-962.
[6] 王垚, 金涌, 魏飞, 等. 原生纳米级颗粒的聚团散式流态化[J]. 化工学报, 2002,53(4):344-348.
[7] 王远保, 刘道银, 王铮, 等. 纳米颗粒的流化特征及滞后现象研究[J]. 动力工程学报, 2018(2):145-150.
[8] 刘道银, 王远保, 王铮, 等. 超细颗粒聚团流化的临界流化速度[J]. 化工学报, 2017,68(11):121-127.
[9] Zhu C, Liu G, Yu Q, et al. Sound assisted fluidization of nanoparticle agglomerates[J]. Powder Technology, 2004,141(1):119-123.
[10] Zeng P, Zhou T, Yang J. Behavior of mixtures of nano-particles in magnetically assisted fluidized bed[J]. Chemical Engineering & Processing Process Intensification, 2008,47(1):101-108.
[11] Espin M J, Valverde J M, Quintanilla M A S, et al. Electromechanics of fluidized beds of nanoparticles[J]. Physical Review E, 2009,79(1):1-7.
[12] Quintanilla M A S, Valverde J M, Castellanos A, et al. Nanofluidization as affected by vibration and electrostatic fields[J]. Chemical Engineering Science, 2008,63(22):5559-5569.
[13] Valverde J M, Espin M J, Quintanilla M A S, et al. Electrofluidized bed of silica nanoparticles[J]. Journal of Electrostatics, 2009,67(2/3):439-444.
[14] Zhou T, Li H. Force balance modelling for agglomerating fluidization of cohesive particles[J]. Powder Technology, 2000,111(1/2):60-65.
[15] Xu C B, Zhu J. Experimental and theoretical study on the agglomeration arising from fluidization of cohesive particles:effects of mechanical vibration[J]. Chemical Engineering Science, 2005,60(23):6529-6541.
[16] Yang J, Zhou T, Song L. Agglomerating vibro-fluidization behavior of nano-particles[J]. Advanced Powder Technology, 2009,20(2):158-163.
[17] Harris A T. On the vibration assisted fluidisation of silica nanoparticles[J]. International Journal of Nanotechnology, 2008,5(2/3):179-194.
[18] Kaliyaperumal S, Barghi S, Briens L, et al. Fluidization of nano and sub-micron powders using mechanical vibration[J]. Particuology, 2011,9(3):279-287.
[19] Nam C H, Pfeffer R, Dave R N, et al. Aerated vibrofluidization of silica nanoparticles[J]. AIChE Journal, 2004,50(8):1776-1785.
[20] Valverde J M, Castellanos A. Effect of vibration on agglomerate particulate fluidization[J]. AIChE Journal, 2006,52(5):1705-1714.
[21] Xu C, Zhu J. Parametric study of fine particle fluidization under mechanical vibration[J]. Powder Technology, 2006,161(2):135-144.
[22] Wang Y, Gu G S, Wei F, et al. Fluidization and agglomerate structure of SiO₂ nanoparticles[J]. Powder Technology, 2002,124(1/2):152-159.
[23] Raganati F, Chirone R, Ammendola P. Gas-solid fluidization of cohesive powders[J]. Chemical Engineering Research & Design, 2018,133:347-387.
[24] Mawatari Y, Ikegami T, Tatemoto Y, et al. Prediction of agglomerate size for fine particles in a vibro-fluidized bed[J]. Journal of Chemical Engineering of Japan, 2003,36(3):277-283.
[25] Stakic M, Urosevic T. Experimental study and simulation of vibrated fluidized bed drying[J]. Chemical Engineering and Processing, 2011,50(4):428-437.