Abstract
Residence times of 1·0, 1·5, and 2·0 cm potato cubes with 0·4, 0·8 and 1·2% aqueous solutions of sodium carboxymethyl cellulose and flow rates of 453, 534 and 599 ml/s in a vertical scraped surface heat exchanger (SSHE) rotating at 60, 110, and 160 rpm were measured, and distribution characteristics of particle flow for each set of conditions were investigated. Pearson's χ 2 goodness of fit test indicated that most of the individual particle residence time distributions in a vertical SSHE flow could be described by the gamma model, whereas many of the individual distributions fitted to the normal model in addition to the gamma model for horizontal SSHE. Orientation of SSHE appeared to be the important factor influencing the forces acting on the particles during flow in a SSHE. Particle-particle interactions, as well as a combination of process parameters, caused ‘tailing’ of some particles, resulting in skewed distributions to the right.
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