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Drying paper by impinging jets of superheated steam. Part 1: Constant drying rate in superheated steam

Authors

  • J. F. Bond,

    Corresponding author
    1. Chemical Engineering Department, McGill University, Pulp and Paper Building, 3420 University St., Montreal, Quebec H3A 2A7
    • Chemical Engineering Department, McGill University, Pulp and Paper Building, 3420 University St., Montreal, Quebec H3A 2A7
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  • A. S. Mujumdar,

    1. Chemical Engineering Department, McGill University, Pulp and Paper Building, 3420 University St., Montreal, Quebec H3A 2A7
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  • A. R. P. van Heiningen,

    1. Chemical Engineering Department, McGill University, Pulp and Paper Building, 3420 University St., Montreal, Quebec H3A 2A7
    2. The Chemical Engineering Department, University of New Brunswick, Fredericton, New Brunswick E3B 5A3, Canada
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  • W. J. M. Douglas

    1. Chemical Engineering Department, McGill University, Pulp and Paper Building, 3420 University St., Montreal, Quebec H3A 2A7
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Abstract

Over a wide range of operating conditions, the drying of paper by impinging jets of superheated steam proceeds by a constant rate period followed by a falling rate period. The constant drying rate, investigated here in the jet temperature range 150 ≤ Tj/ ≤ 465°C and over jet Reynolds numbers of 1000 ≤ Rej ≤ 12000, is predicted within + 12% by a heat transfer expression using Martin's (1977) correlation for the heat transfer coefficient corrected for mass transfer by the Couette flow approximation factor, and a property ratio to account for the large temperature difference between the jet and the paper.

Abstract

Le séchage du papier par des jets de vapeur surchauffée connaît une période de vitesse constante suivie d'une période de ralentissement dans une large gamme de conditions opératoires. La vitesse constante de séchage, étudiée ici dans la gamme de températures des jets de 150 ≤ Tj ≤ 465°C et pour des nombres de Reynolds de jets de 1000 ≤ Rej, ≤ 12000, est prédite avec un écart de + 12% par l'expression de transfert de chaleur utilisant la corrélation de Martin (1977) pour le coefficient de transfert de chaleur corrigé pour le transfert de matière par le facteur d'approximation de l'écoulement de Couette, et un rapport des propriétés pour tenir compte de la différence de température importante entre le jet et le papier.

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