Title
Flow regime identification in fluidized beds by analysing pressure fluctuations signal based on kolomogrov entropy approch
Conference Dates
May 22-27, 2016
Abstract
The investigation of flow regime in gas-solid fluidized bed reactors is very important for their design and scale-up as well as effective operation. In addition, the degrees of mixing, mass and heat transfer in these reactors depending strongly on the common flow regime. In the present work, pressure transducer technique has been used to generate pressure fluctuations signal in gas-solid fluidized bed of 13.97 cm ID. Different static bed heights, different particles size and particles density of both Geldart A and B as well as a range of superficial gas velocity (15-100) cm/s have been used to study the flow regime identification. The Kolmogorov entropy (KE) approach analysis has been applied to pressure fluctuations signal recorded in fluidized bed. The (KE) is considered as a universal tool for the accurate identification of the boundaries of the main hydrodynamic regimes in multiphase reactors. It has been shown that this approach leads to successful identification of the main flow regimes in fluidized bed reactors with different operating conditions.
REFERENCES
1- Nedeltchev, S., Aradhya, S., Zaid, F., & Al-Dahhan, M. (2012). Flow regime identification in three multiphase reactors based on Kolmogorov entropies derived from gauge pressure fluctuations. Journal of Chemical Engineering of Japan, 45(9), 757-764.
2- Nedeltchev, S. (2015). New methods for flow regime identification in bubble columns and fluidized beds. Chemical Engineering Science, 137, 436-446.
3- Nedeltchev, S., Ahmed, F., & Al-Dahhan, M. (2012). A new method for flow regime identification in a fluidized bed based on gamma-ray densitometry and information entropy. Journal of chemical engineering of Japan, 45(3), 197-205.
4- Johnsson, F., Zijerveld, R. C., Schouten, J. C., Van den Bleek, C. M., & Leckner, B. (2000). Characterization of fluidization regimes by time-series analysis of pressure fluctuations. International journal of multiphase flow, 26(4), 663-715.
5- Bi, H. T. (2007). A critical review of the complex pressure fluctuation phenomenon in gas–solids fluidized beds. Chemical Engineering Science,62(13), 3473-3493.
6- van Ommen, J. R., Sasic, S., Van der Schaaf, J., Gheorghiu, S., Johnsson, F., & Coppens, M. O. (2011). Time-series analysis of pressure fluctuations in gas–solid fluidized beds–A review. International Journal of Multiphase Flow,37(5), 403-428.
7- Nedeltchev, S., Jordan, U., Lorenz, O., & Schumpe, A. (2007). Identification of various transition velocities in a bubble column based on Kolmogorov entropy.Chemical engineering & technology, 30(4), 534-539.
8- Nedeltchev, S., Shaikh, A., & Al‐Dahhan, M. (2011). Flow regime identification in a bubble column via nuclear gauge densitometry and chaos analysis.Chemical engineering & technology, 34(2), 225-233.
Muzen, A., & Cassanello, M. C. (2007). Flow regime transition in a trickle bed with structured packing examined with conductimetric probes. Chemical engineering science, 62(5), 1494
Recommended Citation
Muthanna Al-Dahhan and Haidar Taofeeq, "Flow regime identification in fluidized beds by analysing pressure fluctuations signal based on kolomogrov entropy approch" in "Fluidization XV", Jamal Chaouki, Ecole Polytechnique de Montreal, Canada Franco Berruti, Wewstern University, Canada Xiaotao Bi, UBC, Canada Ray Cocco, PSRI Inc. USA Eds, ECI Symposium Series, (2016). https://dc.engconfintl.org/fluidization_xv/7