Multi-scale analysis of flow structures in fluidized beds with immersed tubes

作     者：Hamid R.Norouzi Maryam Tahmasebpoor Reza Zarghami Navid Mostoufi 

作者机构：Multiphase Systems Research Lab.School of Chemical EngineeringCollege of EngineeringUniversity of Tehran Department of Chemical and Petroleum EngineeringUniversity of Tabriz 

出 版 物：《Particuology》 (颗粒学报（英文版）)

年 卷 期：2015年第13卷第4期

页      面：99-106页

核心收录：

学科分类：080706[工学-化工过程机械] 07[理学] 0817[工学-化学工程与技术] 08[工学] 0807[工学-动力工程及工程热物理] 070104[理学-应用数学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0701[理学-数学] 0702[理学-物理学] 

基　　金：supported by the Iranian National Science Foundation(Grant No.93/36348) 

主　　题：Immersed tube Non-linear analysis Pressure fluctuations Recurrence plot Wavelet transform 

摘      要：Multi-scale analysis and non-linear analysis were combined to investigate the hydrodynamics of fluidized beds with and without horizontal tubes. Pressure fluctuations were measured and analyzed employing discrete wavelet analysis, recurrence plot analysis, and recurrence quantification analysis. A systematic procedure was followed to determine wavelet parameters. At low gas velocities, the energy of macro-structures reduces with the addition of the first tube and then increases with the addition of a second tube. However, there is no notable difference at high gas velocities. Determinism is high for the bed without tubes, which can be attributed to the periodic behavior of bubbles. Determinism decreases with the addition of tubes because the breakage of bubbles results in less periodic behavior. The three methods of analysis used in this study captured the effects of immersed tubes on the hydrodynamics of fluidized beds. Recurrence quantitative analysis was found to be a powerful and easy-to-use method that can capture the nonlinear characteristics of fluidized beds much more quickly than conventional methods of nonlinear analysis. This method can thus be effectively used for the online monitoring of hydrodynamic changes in fluidized beds.