Effects of Geometric Properties of a Perforated Plate Used as Gas Distributor on Average Gas Holdup in a Bubble Column

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  • Kawasaki Hiroyuki
    Department of Material Systems Engineering and Life Science, The University of Toyama
  • Kato Hiroyuki
    Department of Material Systems Engineering and Life Science, The University of Toyama
  • Yamamoto Tatsumi
    Department of Material Systems Engineering and Life Science, The University of Toyama
  • Kumazawa Hidehiro
    Department of Material Systems Engineering and Life Science, The University of Toyama

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  • 気泡塔内の平均ガスホールドアップに対するガス分散器として用いた多孔板における幾何学的条件の影響
  • キホウトウ ナイ ノ ヘイキン ガスホールドアップ ニ タイスル ガス ブンサンキ ト シテ モチイタ タコウバン ニ オケル キカガクテキ ジョウケン ノ エイキョウ

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Abstract

The effects of the geometric properties of the perforated plate used as a gas distributor on average gas holdup, φ, were experimentally investigated in a bubble column. The geometric properties of hole diameter, d, the number of holes, n, and the hole pitch, p, were varied as follows: d=0.5, 1.0 and 2.0 mm; n=22, 88, 352, 864 and 1766; and p=0.7, 1.0, 1.6, 2.0, 3.0 and 6.2 cm. The hole arrangement on the perforated plate was a regular triangle. The clear liquid height, Z0, was 0.64 and 1.92 m.<br>For the entire range of superficial gas velocity, uG0, covered in this study, the highest values of φ were obtained with the perforated plates having d=0.5 mm, n=864, p=1.0 cm and d=0.5 mm, n=1766, p=0.7 cm at both values of Z0. The value of φ obtained with the perforated plate of d=0.5 mm, n=88, p=0.7 cm was the smallest at both values of Z0. An empirical correlation predicting the bubble free rising velocity was obtained by use of the dimensional parameter np/dDT2.

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