3. Agglomeration phenomenon and Group C subclasses

According to Geldart's classification, group C powders are not fluidizable due to their very high interparticle forces. However, analysis of the literature shows that fluidization of fine powders in the form of agglomerates (clusters) is sometimes possible. The agglomeration of primary particles into larger structures enables a favorable shift in the ratio between interparticle and hydrodynamic forces. The agglomerates can then reach a size of several tens or even hundreds of micrometers, and behave like group A or B particles. As a result, the aeration rate required to form and fluidize these agglomerates is much higher than the minimum fluidization rate of individual particles obtained by conventional correlations

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Agglomeration phenomenon and Group C subclasses

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Agglomerate structure and size

Bibliography

(1) - GELDART (D.), HARNBY (N.), WONG (A.C.) - Fluidization of cohesive powders. - Powder Technology, 37, p. 25-37 (1984).
(2) - MOLERUS (O.) - Interpretation of Geldart's type A, B, C and D powders by taking into account interparticle cohesion forces....

Software tools

Ergun Fluidization Software http://www.utc.fr/ergun/

Websites

UNIT module (open-access distance learning course): "Powder Science and Technology" and fluidization model http://nte.enstimac.fr/STP/co/STP_web.html http://nte.enstimac.fr/STP/co/OU8.html

Events

Fluidization XV May 22-26, 2016, Fairmont Le Chateau Montebello, Quebec, Canada

World Congress of Particle Technology VIII April 22-26, 2018, Orlando, Florida, United States

9th Symposium on Powder Science and Technology (STP) 2018, Compiègne, France

Patents

K. Saleh, F. Cordier, D. Steinmetz, M. Hemati, S. Gomez Gallardo, B. Chaudret, K. Philippot. Process for manufacturing supported metal nanoparticles in a fluidized bed. National registration no. FR 0107020.

K. Saleh, D. Steinmetz, M. Hemati. Process for coating and laminating fine powders in a fluidized-bed coater. Publication no. 2 791 905, national registration no. 99 04433, Patent FR 2 791 905 A1....