Flow patterns in granulating systems

Forrest, Sarah, Bridgwater, John, Mort, Paul R., Litster, James and Parker, David J. (2003) Flow patterns in granulating systems. Powder Technology, 130 1-3: 91-96. doi:10.1016/S0032-5910(02)00232-2


Author Forrest, Sarah
Bridgwater, John
Mort, Paul R.
Litster, James
Parker, David J.
Title Flow patterns in granulating systems
Journal name Powder Technology   Check publisher's open access policy
ISSN 0032-5910
Publication date 2003-02-19
Sub-type Article (original research)
DOI 10.1016/S0032-5910(02)00232-2
Volume 130
Issue 1-3
Start page 91
End page 96
Total pages 6
Place of publication Lausanne, Switzerland
Publisher Elsevier Science SA
Collection year 2003
Language eng
Subject C1
290699 Chemical Engineering not elsewhere classified
670602 Crop and animal protection chemicals
670400 Human Pharmaceutical Products
290000 Engineering and Technology
290600 Chemical Engineering
Abstract Particle flow patterns were investigated for wet granulation and dry powder mixing in ploughshare mixers using Positron Emission Particle Tracking (PEPT). In a 4-1 mixer, calcium carbonate with mean size 45 mum was granulated using a 50 wt.% solution of glycerol and water as binding fluid, and particle movement was followed using a 600-mum calcium hydroxy-phosphate tracer particle. In a 20-1 mixer, dry powder flow was studied using a 600-mum resin bead tracer particle to simulate the bulk polypropylene powder with mean size 600 mum. Important differences were seen between particle flow patterns for wet and dry systems. Particle speed relative to blade speed was lower in the wet system than in the dry system, with the ratios of average particle speed to blade tip speed for all experiments in the range 0.01-015. In the axial plane, the same particle motion was observed around each blade; this provides a significant advance for modelling flow in ploughshare mixers. For the future, a detailed understanding of the local velocity, acceleration and density variations around a plough blade will reveal the effects of flow patterns in granulating systems on the resultant distribution of granular product attributes such as size, density and strength. (C) 2002 Elsevier Science B.V All rights reserved.
Keyword Engineering, Chemical
Granulation
Ploughshare Mixer
Flow Patterns
Positron Emission Particle Tracking
High-shear Mixer
Positron Camera
Wet Granulation
Agglomeration
Kinetics
Powders
Growth
Q-Index Code C1

 
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Created: Wed, 15 Aug 2007, 02:04:26 EST