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6 results on '"Farnish, Richard J."'

5. Resolving lateral segregation effects of static blenders

Author

Ton, Bram T., Farnish, Richard J., and Zigan, Stefan

Subjects
Finite element method, TA, Computational methods in mechanics, static blender, segregation, Particle methods (Numerical analysis), Elements finits, Mètode dels
Abstract

To date static blenders have mainly been used for mixing fluids, but recent research has shown the potential of static blenders for blending powders and granular materials as well. A problem when using a static blender in conjunction with powders and granular materials is trajectory induced segregation at the output of the blender. In order to evaluate the blending process two granular materials exhibiting extreme particle densities and sizes have been discharged into a static blender. The blend is collected in a radially compartmentalised receiving container and the blend composition of each compartment is then analysed. This paper presents a simple counter measure to reduce the effect of trajectory induced segregation. In addition this research has shown that, contrary to expectations, an increased number of blending stages does not necessarily bring improvements in homogeneity of the output stream. The results presented in this paper are of special interest to anyone blending powders and granular materials in an industrial environment.

Published
2015

6. Breakage Characteristics of Granulated Food Products for Prediction of Attrition during Lean-Phase Pneumatic Conveying.

Author

Kotzur, Benjamin A., Bradley, Michael S. A., Berry, Robert J., and Farnish, Richard J.

Subjects
BREAKAGE, shrinkage, etc. (Commerce), PNEUMATIC-tube transportation, FOOD industry, PRODUCT quality, BREAD crumbs
Abstract

Pneumatic conveying is utilised in a variety of industries to convey food products exhibiting diverse handling characteristics. Attrition of particles caused by this conveying process can result in a number of undesirable outcomes such as loss in product quality or issues in subsequent handling processes. The ability to predict the breakage behaviour of particulate materials is desirable in both new system design and resolving issues in existing plants. This work considers two different particulate materials (Salt and Golden Breadcrumbs) across a range of particle sizes, and quantifies their breakage behaviour under varying impact conditions. Narrow size fractions of each material were degraded; material retained on 250 μm and 355 μm sieves for Salt, and 500 μm, 710 μm and 1,000 μm sieves for Golden Breadcrumbs. Velocity was found to be the most influential factor with respect to particle attrition. The results from the narrow size fraction tests were superimposed to form a simulated full size distribution breakage behaviour, which was then compared to the experimentally determined behaviour. A good agreement was found, however the proportion of material predicted for size fractions smaller than 355 μm for Golden Breadcrumbs and 180 μm for Salt was under-predicted. Recommendations for increasing accuracy of the prediction method are given. [ABSTRACT FROM AUTHOR]

Published
2016
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