Prediction of regime transition in three-phase sparged reactors using linear stability analysis

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• 作者：Swapnil V. Ghatage ; Manish R. Bhole ; Nitin Padhiyar ; Jyeshtharaj B. Joshi ; Geoffrey M. Evans
• 关键词：Bubble column ; Slurry bubble column ; Three-phase fluidization ; Flow regime transition ; Linear stability analysis
• 刊名：Chemical Engineering Journal
• 出版年：1 January, 2014
• 年：2014
• 卷：235
• 期：Complete
• 页码：307-330
• 全文大小：1593 K

文摘

The estimation of critical gas holdup at which the transition from homogeneous regime to heterogeneous regime occurs is crucial for the design and scale-up of multiphase reactors. A number of experimental and empirical studies are published in the literature, however, there exists a lack of modeling studies which can satisfactorily predict the flow regime transition in three-phase sparged reactors.

In the present work, the theory of linear stability analysis has been extended to investigate the hydrodynamic stability of three-phase sparged reactors (slurry bubble columns and three-phase fluidization). A mathematical model has been developed for the prediction of regime transition over a wide range of bubble size (0.7-20 脳 10^鈭? m) and terminal rise velocity (80-340 脳 10^鈭? m/s), particle settling velocity (1-1000 脳 10^鈭? m/s), particle concentration (0.0007-30 vol%) and slurry density (800-5000 kg/m³). It was observed that the developed model predicts the transition gas holdup within an absolute deviation of 12% for three-phase sparged reactors. It was also observed that the developed generalized stability criterion predicts the regime transition in two-phase systems satisfactorily when applied to bubble columns.