Progress and Trends in Rheology II

pp 440-443

Flow of a molten starch through the reverse flight element of a twin screw extrusion cooker

  • J. TayebAffiliated withLaboratoire de Biochimie et Technologie des Glucides, Institut National de la Recherche Agronomique
  • , B. VergnesAffiliated withCentre de Mise en forme des Matériaux, UA 852, Ecole Nationale Supérieure des Mines de Paris

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The reverse screw element is an important part of food processing twin screw extruders, when considering thermomechanical phenomena and product transformation. Using flow rate conservation equations, the pressure and flow rate fields were determined, as well as their evolution with screw speed and feed rate. Experimental confirmation is obtained by computing the residence time distribution.

Key words

Extrusion-cooking reverse flight element maize starch Navier-Stokes equation residence time distribution