Energy Analysis on the Effect of Magnetic Field on Nanoparticles Fluidization

Document Type : Research Paper


Multiphase Systems Research Lab, School of Chemical Engineering, College of Engineering, University of Tehran, Tehran, Iran


Effects of magnetic field strength and direction were studied on the fluidization of titanium oxide nanoparticles (anatase phase) with ferromagnetic iron (III) oxide nanoparticles. The main hydrodynamic structures were defined and studied using wavelet transform. Energy analysis was used to study the effect of the field direction and strength on fluidization. The results suggested that mesostructures (agglomerates) have the most effect on the nanoparticle fluidization characteristics. Higher energy at high field strength for upward direction, suggests more intense interaction between agglomerates in the bed for nanoparticles that result in more stochastic pattern and lower ABF regime characteristics. Downward direction at low magnetic field strength shows improving the fluidization quality by the effect of the vibration of the solenoid. It was observed that at low field strength, vibration has a major effect on fluidization than the magnetic force. At high magnetic field strength, as the magnetic force becomes stronger, the downward field decreases the energy of finer structure (agglomerates) which leads to less movement and resistance against fluidization.


  1. Van Ommen JR, Valverde JM, Pfeffer R. Fluidization of nanopowders: a review. Journal of nanoparticle research. 2012;14(3):1-29.
  2. Zhao Z, Liu D, Ma J, Chen X. Fluidization of nanoparticle agglomerates assisted by combining vibration and stirring methods. Chemical Engineering Journal. 2020;388:124213.
  3. Mostoufi N. Revisiting classification of powders based on interparticle forces. Chemical Engineering Science. 2021;229:116029.
  4. Geldart D. Types of gas fluidization. Powder technology. 1973;7(5):285-92.
  5. Esmailpour AA, Mostoufi N, Zarghami R. Effect of temperature on fluidization of hydrophilic and hydrophobic nanoparticle agglomerates. Experimental Thermal and Fluid Science. 2018;96:63-74.
  6. Seville J, Willett C, Knight P. Interparticle forces in fluidisation: a review. Powder Technology. 2000;113(3):261-8.
  7. Shabanian J, Jafari R, Chaouki J. Fluidization of ultrafine powders. International review of chemical engineering. 2012;4(1):16-50.
  8. Yao W, Guangsheng G, Fei W, Jun W. Fluidization and agglomerate structure of SiO2 nanoparticles. Powder Technology. 2002;124(1-2):152-9.
  9. Liu Y, Ohara H, Tsutsumi A. Pulsation-assisted fluidized bed for the fluidization of easily agglomerated particles with wide size distributions. Powder Technology. 2017;316:388-99.
  10. An K, Andino JM. Enhanced fluidization of nanosized TiO2 by a microjet and vibration assisted (MVA) method. Powder Technology. 2019;356:200-7.
  11. Hoorijani H, Zarghami R, Nosrati K, Mostoufi N. Investigating the hydrodynamics of vibro-fluidized bed of hydrophilic titanium nanoparticles. Chemical Engineering Research and Design. 2021;174:486-97.
  12. Vahdat MT, Zarghami R, Mostoufi N. Fluidization characterization of nano-powders in the presence of electrical field. The Canadian Journal of Chemical Engineering. 2018;96(5):1109-15.
  13. Karimi F, Haghshenasfard M, Sotudeh-Gharebagh R, Zarghami R, Mostoufi N. Enhancing the fluidization quality of nanoparticles using external fields. Advanced Powder Technology. 2018;29(12):3145-54.
  14. van Ommen JR, Sasic S, van der Schaaf J, Gheorghiu S, Johnsson F, Coppens M-O. Time-series analysis of pressure fluctuations in gas–solid fluidized beds – A review. International Journal of Multiphase Flow. 2011;37(5):403-28.
  15. Zarghami R, Mostoufi N, Sotudeh-Gharebagh R. Nonlinear characterization of pressure fluctuations in fluidized beds. Industrial & engineering chemistry research. 2008;47(23):9497-507.
  16. Tamadondar MR, Zarghami R, Tahmasebpoor M, Mostoufi N. Characterization of the bubbling fluidization of nanoparticles. Particuology. 2014;16:75-83.
  17. Farahani AA, Norouzi HR, Zarghami R. Mixing of nanoparticle agglomerates in fluidization using CFD-DEM at ABF and APF regimes. Chemical Engineering Research and Design. 2021;169:165-75.
  18. Liu H, Wang S. Fluidization behaviors of nanoparticle agglomerates with high initial bed heights. Powder Technology. 2021;388:122-8.
  19. Hoorijani H, Zarghami R, Mostoufi N. Studying the effect of direction and strength of magnetic field on fluidization of nanoparticles by recurrence analysis. Advanced Powder Technology. 2022.
  20. Rodrigues A, Dmello G, Pai P. Selection of Mother Wavelet for Wavelet Analysis of Vibration Signals in Machining. Journal of Mechanical Engineering and Automation 2016, 6(5A): 81-85.
  21. Rioul O, Vetterli M. Wavelets and signal processing. IEEE signal processing magazine. 1991;8(4):14-38.
  22. Tahmasebpoor M, Zarghami R, Sotudeh-Gharebagh R, Mostoufi N. Characterization of fluidized beds hydrodynamics by recurrence quantification analysis and wavelet transform. International journal of multiphase flow. 2015;69:31-41.
Volume 56, Issue 1
June 2022
Pages 153-164
  • Receive Date: 21 January 2022
  • Revise Date: 03 April 2022
  • Accept Date: 05 April 2022
  • First Publish Date: 22 April 2022