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Effect of Impeller Geometry on Gas-Liquid Mass Transfer Coefficients in Filamentous Suspensions

  • Sundeep N. Dronawat
  • C. Kurt Svihla
  • Thomas R. Hanley
Chapter
Part of the Applied Biochemistry and Biotechnology book series (ABAB, volume 63-65)

Abstract

Volumetric gas-liquid mass transfer coefficients were measured in suspensions of cellulose fibers with concentrations ranging from 0 to 20 g/L. The mass transfer coefficients were measured using the dynamic method. Results are presented for three different combinations of impellers at a variety of gassing rates and agitation speeds. Rheological properties of the cellulose fibers were also measured using the impeller viscometer method. Tests were conducted in a 20 L stirred-tank fermentor and in 65 L tank with a height to diameter ratio of 3:1. Power consumption was measured in both vessels. At low agitation rates, two Rushton turbines gave 20% better performance than the Rushton and hydrofoil combination and 40% better performance than the Rushton and propeller combination for oxygen transfer. At higher agitation rates, the Rushton and hydrofoil combination gave 14 and 25% better performance for oxygen transfer than two Rushton turbines and the Rushton and hydrofoil combination, respectively.

Index Entries

Filamentous Suspensions Gas-liquid mass transfer non-Newtonian rheology 

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Copyright information

© Humana Press Inc. 1997

Authors and Affiliations

  • Sundeep N. Dronawat
    • 1
  • C. Kurt Svihla
    • 1
  • Thomas R. Hanley
    • 1
  1. 1.Department of Chemical Engineering, Speed Scientific SchoolUniversity of LouisvilleLouisvilleUSA

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