Effect of Clearance between Two Sensor-Probes on Measured Values of Bubble Properties in a Bubble Column.

  • Kikuchi Ken-ichi
    Department of Materials-Process Engineering and Applied Chemistry for Environments, Faculty of Engineering and Resource Science, Akita University
  • Takahashi Hiroshi
    Department of Materials-Process Engineering and Applied Chemistry for Environments, Faculty of Engineering and Resource Science, Akita University
  • Koike Takatoshi
    Department of Materials-Process Engineering and Applied Chemistry for Environments, Faculty of Engineering and Resource Science, Akita University
  • Chiba Shigeki
    Department of Materials-Process Engineering and Applied Chemistry for Environments, Faculty of Engineering and Resource Science, Akita University

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Abstract

The effect of probe clearance on the rising velocity and chord length of bubbles in a bubble column was examined in measurements with the two-channel U-shaped optical fiber probe method. The probe clearances ranged from 0.2 to 1.5 cm. A few restrictions required in the signal processing to obtain the reasonable data. With increasing probe clearance, the observed values of the bubble velocities slightly increase; however, those of the bubble chord lengths drastically increase to 160% in the coalesced bubble regime, though they are almost constant in the dispersed bubble regime. A simple theory is proposed considering the probability of bubbles contacting with the probes, and used to successfully explain the experimental results.

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