Abstract
Individual fine particles suspended in a gas flow undergo a process of aggregation due to interparticle attraction. As the aggregate grows in size, the gas drag force on the surface of the aggregate increases to compensate the aggregate weight. Thus, the size of the aggregate becomes limited by the balance between the shear force exerted by the gas on the particles in the aggregate outer ring and interparticle attractive force. In this chapter, a fundamental equation is developed to predict the size of these dynamic aggregates.
This is a preview of subscription content, log in via an institution to check access.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
References
Gady, B., Schleef, D., Reifenberger, R., Rimai, D., DeMejo, L.P.: Identification of electrostatic and van der Waals interaction forces between a micrometer-size sphere and a flat substrate. Phys. Rev. B 53, 8065–8070 (1996)
Hamaker, H.C.: The London-van der Waals attraction between spherical particles. Physica 4, 1058–1072 (1937)
Castellanos, A.: The relationship between attractive interparticle forces and bulk behaviour in dry and uncharged fine powders. Adv. Phys. 54, 263–376 (2005)
Krupp, H.: Particle adhesion. Theory and experiment. Adv. Colloid Interface Sci. 1, 111–239 (1967)
Massimilla, L., Donsi, G.: Cohesive forces between particles of fluid-bed catalysts. Powder Technol. 15(2), 253–260 (1976)
Rietema, K.: The Dynamics of Fine Powders. Elsevier, London (1991)
Schaeffer, D.M., Carpenter, M., Gady, B., Reifenberger, R., DeMejo, L.P., Rimai, D.S.: Surface roughness and its influence on particle adhesion using atomic force techniques. In: Rimai, D.S., DeMejo, L.P., Mittal, K.L. (eds.) Fundamentals of Adhesion and Interfaces, pp. 35–48. VSP, Utrecht, The Netherlands (1995)
Castellanos, A.: The relationship between attractive interparticle forces and bulk behaviour in dry and uncharged fine powders. Adv. Phys. 54, 263–376 (2005)
Feng, J.Q.: Electrostatic interaction between two charged dielectric spheres in contact. Phys. Rev. E 62, 2891–2897 (2000)
Bauccio, M. (ed.): ASM Engineered Materials Reference Book, 2nd edn. ASM International, Materials Park (1994)
Glor, M.: Hazards due to electrostatic charging of powders. J. Electrost. 16, 175–191 (1985)
Hays, D.A.: Adhesion of charged particles. In: Rimai, D.S., DeMejo, L.P., Mittal, K.L. (eds.) Fundamentals of Adhesion and Interfaces, pp. 61–71. VSP, Utrecht, The Netherlands (1995)
Hendricks, C.D.: Electrostatic imaging. In: Moore, A.D. (ed.) Electrostatics and Its Applications, pp. 281–306. John Wiley & Sons, New York (1973)
Valverde, J.M., Quintanilla, M.A.S., Espin, M.J., Castellanos, A.: Nanofluidization electrostatics. Phys. Rev. E 77, 031301 (2008)
Sutherland, D.N., Tan, C.T.: Sedimentation of a porous sphere. Chem. Eng. Sci. 25(12), 1948–1950 (1970). doi:10.1016/0009-2509(70)87013-0
Zhu, C., Yu, Q., Dave, R.N., Pfeffer, R.: Gas fluidization characteristics of nanoparticle agglomerates. AIChE J. 51, 426–439 (2005)
Nguyen, H.P., Chopard, B., Stoll, S.: Hydrodynamic properties of fractal aggregates in 2D using lattice Boltzmann simulation. Future Gener. Comput. Syst. 20, 981–991 (2004)
Chopard, B., Nguyen, H., Stoll, S.: A lattice Boltzmann study of the hydrodynamic properties of 3D fractal aggregates. Math. Comput. Simul. 72, 103–107 (2006)
Castellanos, A., Valverde, J.M., Quintanilla, M.A.S.: Aggregation and sedimentation in gas-fluidized beds of cohesive powders. Phys. Rev. E. 64, 041304 (2001)
Witten, T.A., Sander, L.M.: Diffusion-limited aggregation, a kinetic critical phenomenon. Phys. Rev. Lett. 47, 1400–1403 (1981)
Kantor, Y., Witten, T.A.: Mechanical stability of tenuous objects. J. Phys. Lett. 45, 675–679 (1984)
Manley, S., et al.: Limits to gelation in colloidal aggregation. Phys. Rev. Lett. 93, 108302 (2004)
Kantor, Y., Webman, I.: Elastic properties of random percolating systems. Phys. Rev. Lett. 52, 1891–1894 (1984)
Quintanilla, M.A.S., Valverde, J.M., Castellanos, A.: The transitional behavior of avalanches in cohesive granular materials. J. Stat. Mech. Theory Exp. 7, 07015 (2006)
Valverde, J.M., Castellanos, A.: High viscosity gas fluidization of fine particles: An extended window of quasihomogeneous flow. Phys. Rev. E 74, 021302 (2006)
Valverde, J.M., Quintanilla, M.A.S., Castellanos, A., Mills, P.: The settling of fine cohesive powders. Europhys. Lett. 54, 329–334 (2001)
Pfeffer, C.N.R., Dave, R.N., Sundaresan, S.: Aerated vibrofluidization of silica nanoparticles. AIChE J. 50, 1776–1785 (2004)
Valverde, J.M., Castellanos, A.: Random loose packing of cohesive granular materials. Europhys. Lett. 75(6), 985–991 (2006)
Author information
Authors and Affiliations
Rights and permissions
Copyright information
© 2013 Springer Science+Business Media Dordrecht
About this chapter
Cite this chapter
Valverde Millán, J.M. (2013). Dynamic Aggregation of Fine Particles in Gas-Fluidized Beds. In: Fluidization of Fine Powders. Particle Technology Series, vol 18. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-5587-1_7
Download citation
DOI: https://doi.org/10.1007/978-94-007-5587-1_7
Publisher Name: Springer, Dordrecht
Print ISBN: 978-94-007-5586-4
Online ISBN: 978-94-007-5587-1
eBook Packages: Chemistry and Materials ScienceChemistry and Material Science (R0)