Optical Fiber Probes for Bubble Dynamics Measurement in

Optical Fiber Probes for Bubble Dynamics Measurement in Bubble Columns J. L. Xue, M. H. Al-Dahhan & M. P. Dudukovic In cooperation with Robert F. Mudde Delft University of Technology, The Netherlands Chemical Reaction Engineering Laboratory (CREL) November, 2001 CHEMICAL REACTION ENGINEERING LABORATORY

The Configuration of the Four-point Probe: Probe r Tip 2 Tip 3 Tip 1 L Three of the tips are of the same length and form an equilateral triangle. The central tip is about 1. 5 mm longer than the others. The diameter of the probe is 1. 2 mm (r=0. 6 mm) Tip 0 Tip 3 r r r Tip 2 Tip 0 Tip 1 Configuration of the four point fiber optical probe Bubble rise velocity: Sketch of pulse sequences Bubble chordal length pierced by probe tip: Local gas holdup: CHEMICAL REACTION ENGINEERING LABORATORY

Measurement Error due to Bubble Fluctuation and the Deviation of the Bubble velocity from the Probe Axial Direction: Schematic of the Bubble Fluctuation T 2 T 3 T 1 v T 0 j (degree) Calculated Relative Error for Bubble Velocity due to the Deviation of the Bubble Velocity from the Probe Axial Direction (L=1. 5 mm, r=0. 6 mm) Schematic of the Deviation of the Bubble Velocity from the Probe Axial Direction CHEMICAL REACTION ENGINEERING LABORATORY

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