Download Applications of Fluidization to Food Processing by Peter G. Smith PDF

By Peter G. Smith

Fluidization is a method that permits sturdy debris to tackle a few of the houses of a fluid. regardless of being very conventional in the nutrition processing undefined, figuring out of this crucial procedure is frequently limited.

Applications of Fluidization to nutrition Processing units out the tested conception of fluidization and relates this to nutrition processing purposes, relatively in:
* Drying
* Freezing
* Mixing
* Granulation
* Fermentation

This vital and thorough e-book, written via Peter Smith, who has a long time' event instructing and getting to know in foodstuff processing, is a necessary instrument and reference for nutrition scientists and technologists, and engineers operating in the foodstuff undefined. Libraries, and learn and improvement teams inside all universities and examine institutions the place meals technological know-how, nutrients reviews, nutrients expertise, physics and engineering are studied and taught must have copies of this helpful e-book

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Example text

There is a very wide variety of designs (Kunii and Levenspiel, 1991) from open nozzles to complex bubble caps. The latter have small orifices around the periphery of a cap which rises or falls depending on the balance between the pressure of gas below and the back-pressure from above. The use of bubble caps can prevent the back-flow of solids (Botterill, 1975) and they may be designed to allow stagnant defluidized solids to lie between the caps, for example to provide thermal insulation for the protection of the distributor in high temperature processes.

20 Centrifugal fluidized bed. From Hanni et al. (1976), by permission of the Institute of Food Technologists, USA. 21 Fluidization regimes in a centrifugal fluidized bed. From Hanni et al. (1976), by permission of the Institute of Food Technologists, USA. 8 Hz). The plenum was divided into two equal lengths, allowing different drying conditions in the feed zone and the discharge zone of the bed respectively. Air passed through the perforations of the drying cylinder and left the plenum to be reheated and recirculated.

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. The diameter of the orifices in a perforated plate distributor varies from 1 or 2 mm in small beds used for research or very small-scale production to 50 mm in very large chemical reactors.

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