Title: Grinding in an air classifier mill - Part I: Characterisation of the one-phase flow
Authors: Toneva, Petya
Epple, Philipp
Breuer, Michael 
Peukert, Wolfgang
Wirth, Karl Ernst
Language: eng
Issue Date: 25-Jul-2011
Publisher: Elsevier
Document Type: Article
Source: In: Powder technology. - Amsterdam [u.a.] : Elsevier Science, 1967- ; ZDB-ID: 2019938-7 . - Bd. 211.2011, 1, Seite 19-27
Journal / Series / Working Paper (HSU): Powder Technology
Volume: 211
Issue: 1
Page Start: 19
Page End: 27
Publisher Place: Amsterdam
In this and the related second paper [1], we present an in-depth study of the two-phase flow and the stressing conditions of particles in an air classifier hammer mill. This type of mill belongs to the mostly used mills at all. In order to develop a predictive grinding model not only the material's reaction to the applied stress but also the stressing conditions within the mill, e.g. impact velocity, incidence angle, number of stress events, have to be known. The latter are strongly affected by the interactions between the fluid and the solid phase within the mill. Systematic flow investigations in the vicinity of the impact elements and in the region of the internal classifier have been performed by Particle Image Velocimetry (PIV) and by numerical predictions of the fluid flow in the complete mill using a commercial CFD solver. Different pin geometries have been studied at various peripheral velocities of the grinding disk and the classifier. The classifier velocity does not influence the velocity profiles near the impact elements in the main flow direction and vice versa, the flow in the grinding zone has little influence on the classification. The velocity profile in front of the impact element, where the comminution process takes place, is constant with time and preserves a characteristic form independent of the operational conditions. © 2011 Elsevier B.V.
Organization Units (connected with the publication): Strömungsmechanik 
ISSN: 00325910
Publisher DOI: 10.1016/j.powtec.2011.03.009
Appears in Collections:3 - Reported Publications

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