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Using a Population Balance Model Coupled with Structural Effects to Aid Product Design of Bran Cereal
Particle degradation is a mechanistic based process – a function of the structure of individual agglomerates in a system. Degradation can be caused by stress-strain or impact events. This breakage can result from fracture of agglomerates to smaller particles or knocking off corners of large particles by abrasion. To mitigate degradation of a given product, Industry often uses single point indices tests to estimate particle size degradation in typical processes which provide an accurate estimate ONLY if the true cause of degradation in the process matches that measured with the particular tester. Population balance modeling provides a powerful tool to determine the root cause of material degradation and offers guidance on how the material should be changed to reduce degradation. Both a simple index approach and a population balance model (coupled with a particle structural analysis) are addressed. Each analysis gives information concerning the behavior of a product in a process. A population balance model also provides information about the cause of particle breakage. This paper reviews advantages and disadvantages of both methods using bran cereal as an example.

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