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TECHNICAL PAPERS

Effect of Perforated Plate Open Area on Gas Holdup in Rayon Fiber Suspensions

[+] Author and Article Information
Xuefeng Su

 Department of Mechanical Engineering, Ames, Iowa 50011-2161

Theodore J. Heindel1

 Department of Mechanical Engineering, Ames, Iowa 50011-2161theindel@iastate.edu

1

Corresponding author.

J. Fluids Eng 127(4), 816-823 (Apr 14, 2005) (8 pages) doi:10.1115/1.1994878 History: Received July 07, 2004; Revised April 14, 2005

Three different aeration plates are used to study their effect on gas holdup and flow regime transition in fiber suspensions. The aeration plates differ by their open-area ratios (A=0.57%, 0.99%, and 2.14%), where the hole diameter remains the same while the number of holes increase. Experiments are performed using three different Rayon fiber lengths (L=3, 6, and 12mm) over a range of superficial gas velocities (Ug18cms) and fiber mass fractions (0C1.8%) in a 15.24cm dia semi-batch bubble column. Experimental results show that the aeration plate with A=0.99% produces the highest gas holdup in an air-water system and low fiber mass fraction suspensions, and the plate with A=2.14% yields the lowest gas holdup in these systems. In medium fiber mass fraction suspensions, the plate with A=0.57% produces slightly higher gas holdup values, while the other two plates yield similar results. The effect of the aeration plate open area on gas holdup diminishes at high fiber mass fractions (C1.2%). All aeration plates generate homogeneous, transitional, and heterogeneous flow regimes over the range of superficial gas velocities for air-water and low fiber mass fraction suspensions. However, the aeration plate with A=2.14% enhances the flow regime transition, i.e., the superficial gas velocity at which transitional flow appears is lower. Additionally, the fiber mass fraction at which pure heterogeneous flow is observed is lower when A=2.14%.

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Copyright © 2005 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic of experimental bubble column

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Figure 2

Gas distributor plates: (a) A=0.57%, (b) A=0.99%, and (c) A=2.14%

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Figure 3

Gas holdup and flow regime transition using different aeration plates in an air-water system

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Figure 4

Effect of fiber mass fraction on gas holdup with different aeration plates for L=3mm Rayon fiber suspensions: (a) A=0.57%, (b) A=0.99%, and (c) A=2.14%

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Figure 5

Effect of aeration plate open area on gas holdup at various fiber mass fractions (L=3mm): (a) C=0.1%, (b) C=0.25%, (c) C=0.6%, and (d) C=1.2%

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Figure 6

Effect of fiber length on gas holdup: (a) A=0.57%, (b) A=0.99%, and (c) A=2.14%

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Figure 7

Effect of fiber length and aeration plate open area on gas holdup at C=1.4%

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Figure 8

Effect of aeration plate open area, fiber mass fraction, and fiber length on the superficial gas velocity at which flow regime transition is initiated

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