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<p>The gas holdup, bubble size distribution and interfacial area of vertical short blades (SBs) and two pitched SBs with the inclined angles of the SBs from 60°to 45° stirred tank were measured by the electrical conductivity probe technique in the up-pumping mode. Results show that the gas holdup is higher, and the bubble size is also larger in the long blades (LBs) region; In the SBs region, the gas holdup is lower, but the bubble size is also smaller. When the rotating speed is lower, the gas is concentrated in the LBs region. When the rotating speed is high enough, two pitched SBs can significantly increase the gas holdup in the stirred tank. The modified configuration with 60U or 45U impeller can further improve the gas–liquid interface area. The effective fluid exchange between the radial flow generated by the LBs and the strong axial flow generated by the pitched SBs redistribute the bubbles effectively in the 60U or 45U stirred tank. The correlation of power input and rotating speed on gas holdup is fitted.</p>

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Measurement of gas–liquid dispersion characteristics in long-short blades impeller stirred tank by electrical conductivity probe technology in up-pumping mode

  • 期刊论文

  • 发表日期：

    2025年2月13日

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  • Yongjun Wu,
  • Yong Lin

摘要

The gas holdup, bubble size distribution and interfacial area of vertical short blades (SBs) and two pitched SBs with the inclined angles of the SBs from 60°to 45° stirred tank were measured by the electrical conductivity probe technique in the up-pumping mode. Results show that the gas holdup is higher, and the bubble size is also larger in the long blades (LBs) region; In the SBs region, the gas holdup is lower, but the bubble size is also smaller. When the rotating speed is lower, the gas is concentrated in the LBs region. When the rotating speed is high enough, two pitched SBs can significantly increase the gas holdup in the stirred tank. The modified configuration with 60U or 45U impeller can further improve the gas–liquid interface area. The effective fluid exchange between the radial flow generated by the LBs and the strong axial flow generated by the pitched SBs redistribute the bubbles effectively in the 60U or 45U stirred tank. The correlation of power input and rotating speed on gas holdup is fitted.