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Drag on individual cubic assemblies of spheres in non-newtonian tube flow

Authors

  • Girish Subramaniam,

    1. Department of Agricultural and Biological Engineering, The Pennsylvania State University, University Park, PA 16803, U.S.A.
    Current affiliation:
    1. ASTEC, 4403 First Ave. S.E., Cedar Rapids, IA 52402, U.S.A.
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  • Carlos A. Zuritz

    Corresponding author
    1. Department of Agricultural and Biological Engineering, The Pennsylvania State University, University Park, PA 16803, U.S.A.
    • Department of Agricultural and Biological Engineering, The Pennsylvania State University, University Park, PA 16803, U.S.A.
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Abstract

An obstacle in modeling aseptic processing of particulate foods is the lack of a reliable estimator for the drag force of the non-Newtonian liquid phase on the suspended particles as they flow through the holding tubes of such systems. The objective was to develop an expression for the drag force on cubic assemblies of spherical particles suspended in a pseudoplastic fluid flowing in a tube.

An apparatus was assembled for direct measurement of the drag force exerted by solutions of sodium carboxymethyl cellulose (CMC) on the assemblies inside a tube. An empirical drag correction factor, as a function of particle volume fraction (applicable to Stokes' law), was developed.

Abstract

Un des obstacles du traitement aseptique par modélisation d'aliments particulaires est l'absence d'un facteur d'estimation fiable pour la force de traǐnée de la phase liquide non newtonienne sur les particules suspendues s'écoulant dans les tubes de rétention de tels systèmes. L'objectif est d'établir une expression pour la force de traǐnée sur les assemblages cubiques des particules spétriques suspendues dans un fluide pseudoplastique qui s'écoule dans un tube.

On a monté un appareil pour la mesure directe de la force de traǐnée exercée par des solutions de carboxyméthyl cellulose (CMC) de sodium sur les assemblages à l'intérieur d'un tube. Un facteur empirique de correction de la force de traǐnée a été établi en fonction de la fraction du volume des particules (applicable è la loi de Stoke).

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