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Details of Grant 

EPSRC Reference: GR/J75135/01
Title: POWDER AND PASTE MIXING USING POSITRON-BASED 3D IMAGING TECHNIQUES
Principal Investigator: Beynon, Professor T
Other Investigators:
Parker, Professor DJ Bridgwater, Professor J
Researcher Co-Investigators:
Project Partners:
Department: School of Physics and Astronomy
Organisation: University of Birmingham
Scheme: Standard Research (Pre-FEC)
Starts: 01 September 1994 Ends: 31 August 1997 Value (£): 157,951
EPSRC Research Topic Classifications:
Particle Technology Rheology
EPSRC Industrial Sector Classifications:
Construction Food and Drink
Pharmaceuticals and Biotechnology
Related Grants:
Panel History:  
Summary on Grant Application Form
A positron camera allows single particles down to 1 mm in size to be tracked accurately when moving at 2 m/s. The camera is used to unravel some of the many mysteries surrounding the poorly understood operation of powder mixing, which is central to areas as diverse as food, advanced materials and paste preparation. It is known that performance is very sensitive to the equipment and particle properties. A purpose of the programme is to demonstrate for the first time the conditions necessary for geometric and dynamic similarity as demanded by the underlying dimensionless groups. Another is the investigation of the influence of bed fill, rotational speed, blade spacing and geometry in the axial and radial displacements, and velocities. The behaviour of segregating particles, be it due to size or density, is another key feature. The tracer particles will be further used to follow paste mixing in a parallel set of studies conducted on the same equipment. Here it is anticipated that the behaviour of the process will be linked to the macroscopic rheological properties concerned with the behaviour of the paste in extension or in shear.
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Organisation Website: http://www.bham.ac.uk