Journal
CHEMICAL ENGINEERING SCIENCE
Volume 211, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ces.2019.115257
Keywords
Incoherent analysis; Wet particle; Flow transition; Bubble dynamics; Turbulence
Categories
Funding
- Science Fund for Creative Research Groups of National Natural Science Foundation of China [61621002]
- National Natural Science Foundation of China for Young [21808198]
- Major Research Project of National Natural Science Foundation of China [91834303]
- Natural Science Foundation of Zhejiang Province for Young [LQ18B060001]
- National Science Fund for Distinguished Young [21525627]
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This paper studies the bubble dynamics and flow transition behavior in wet particle systems. Non-coherent algorithm was used to quantitatively calculate the bubble diameters in a three-dimensional fluidized bed system loaded with wet particles, obtaining the bubble dynamics under the action of liquid. The results indicate that the incoherent analysis can detect the formation of even tiny bubbles in the fluidized bed. The kurtosis and skewness of the pressure fluctuation signal was used to obtain the critical transition conditions of the flow pattern from turbulent to laminar. Through the decay index of the incoherent spectrum, the operating conditions of the Levy-Kolmogorov flow pattern to the Kolmogorov flow region were determined. From the comparison of the liquid bridge and the drag forces, the competitive mechanism of different forces acting on the particles that conformed the bed was analyzed, reflecting the change of the apparent minimum fluidization velocity of wet particles. (C) 2019 Elsevier Ltd. All rights reserved.
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