By Peter G. Smith
Fluidization is a method that allows sturdy debris to tackle the various houses of a fluid. regardless of being very common in the foodstuff processing undefined, knowing of this crucial process is frequently limited.
Applications of Fluidization to meals Processing units out the validated thought of fluidization and relates this to meals processing purposes, quite in:
This vital and thorough e-book, written by way of Peter Smith, who has a long time' adventure educating and learning in foodstuff processing, is a necessary device and reference for nutrients scientists and technologists, and engineers operating in the nutrition undefined. Libraries, and examine and improvement teams inside all universities and study institutions the place meals technology, meals reports, meals expertise, physics and engineering are studied and taught must have copies of this helpful ebook
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Extra info for Applications of Fluidization to Food Processing
Simple perforated plate-type distributors suffer from particles passing back through to the plenum despite mean gas velocities well above the settling velocity for the particles. This is because of imbalances in gas ﬂow between the oriﬁces, which is difﬁcult to eliminate. Hence, such plates take the form of either a layer of mesh sandwiched between two perforated plates or two staggered perforated plates without a mesh screen (Kunii and Levenspiel, 1991). However, these structures often lack rigidity and need to be reinforced or sometimes curved (concave to the bed) to withstand heavy loads.
Other types of ﬂuidization Spouted beds A spouted bed requires a cylindrical container with an inverted conical base and a vertical pipe entering at the apex of the cone. 19. Particles are carried at high velocity upwards in the central jet in a dilute phase and at the bed surface the particles form a kind of fountain and rain down onto the clearly deﬁned surface. They then travel down the bed in the annulus at much lower velocities than those in the central spout. On reaching the gas inlet point, the particles are re-entrained and thus complete a well-deﬁned and regular cycle.
Porous or sintered plates are the ideal and are used in small-scale studies of ﬂuidized bed behaviour (Kunii and Levenspiel, 1991) and form a highly expanded unstable gas-solid dispersion directly above the distributor which rapidly divides into a large number of small bubbles plus an emulsion phase. Bubbles grow rapidly thereafter by coalescence. Kunii and Levenspiel (1991) also suggest that other A Description of Fluidized Bed Behaviour 21 materials offer similar properties to porous plates, including ﬁlter cloths, compressed ﬁbres, compacted wire plates and even thin beds of small particles.