Prediction of solid concentration profiles in three-phase reactors by a wake shedding model

✍ Scribed by Atsushi Tsutsumi; Tawatchai Charinpanitkul; Kunio Yoshida

• Publisher: Elsevier Science
• Year: 1992
• Tongue: English
• Weight: 633 KB
• Volume: 47
• Category: Article
• ISSN: 0009-2509
• DOI: 10.1016/0009-2509(92)85052-d

✦ Synopsis

A structural model for predicting axial solid concentration profile in three-phase reactors is presented. The model takes account of the entrainment of solid particles due to bubble wake motion in the axial solid mixing. The prediction of axial solid concentration profiles from the model shows good agreement with data obtained in a wide range of experimental conditions. KEwwoRDs three-phase reactor; wake shedding model; axial solid concentration profile JNTRODUCXJON In cocurrent gas-liquid-solid reactors the axial distribution of solid particles has been recognized as an important factor determining the hydrodynamic characteristics of reactors (e.g., Fan, 1989). Considerable efforts, therefore, have been made toward the quantitative description of the axial solid distribution. Most of them have been based on the sedimentation-dispersion model that was originally proposed by Cova (1966) and Suganuma and Yamanishi (1966). The model considers a solids axial dispersion flux and a solids sedimentation flux superimposed on the average slurry convection flux. For the batch mode with respect to solids and liquids the sedimentationdispersion model gives the expression of the axial solid distribution as Cf = CfO exp (WEp~Z) (1)