Identification of the Main Transition Velocities in a Bubble Column Based On a Modified Shannon Entropy
Identification of the Main Transition Velocities in a Bubble Column Based On a Modified Shannon Entropy
Nedeltchev, S.; Schubert, M.
The gas holdup fluctuations in a bubble column (0.15 m in ID) have been recorded by means of a conductivity wire-mesh sensor in order to extract information about the main transition velocities. These parameters are very important for bubble column design, operation and scale-up. For this purpose, the classical definition of the Shannon entropy was modified and used to identify both the onset (at Ug=0.034 m/s) of the transition flow regime and the beginning (at Ug=0.089 m/s) of the churn-turbulent flow regime. The results were compared with the Kolmogorov entropy (KE) results. A slight discrepancy was found, namely the transition velocities identified by means of the KE were shifted to somewhat higher (0.045 and 0.101 m/s) superficial gas velocities Ug.
Keywords: Bubble column; Gas holdup fluctuations; Modified Shannon entropy; Kolmogorov entropy
Involved research facilities
- TOPFLOW Facility
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Lecture (Conference)
18th International Conference on Chemical, Biochemical and Biomolecular Engineering (ICCBBE 2016), 25.-26.02.2016, London, United Kingdom - International Journal of Chemical, Molecular, Nuclear, Materials and Metallurgical Engineering 10(2016)2, 214-217
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