Gas-liquid mass transfer in co-current three-phase fluidized beds with non-Newtonian fluids: Theoretical models based on the energy dissipation rate

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• 作者：Hideki Miura ; Takashi Katoh ; Yoshinori Kawase ; ^{ykawase@toyonet.toyo.ac.jp}
• 关键词：Co-current three-phase fluidized bed ; Non-Newtonian liquid ; Gas&ndash ; liquid mass transfer ; Gas hold-up
• 刊名：Chemical Engineering Journal
• 出版年：2012
• 期刊代码：16_13858947
• 类别：ce
• 出版时间：15 March, 2012
• 卷：185-186
• 期：Complete
• 页码：337-346
• 文件大小：1083 K

摘要

The gas-liquid mass transfer in the co-current three-phase fluidized bed with non-Newtonian liquids was studied. Gas hold-ups (蠒_g) and volumetric gas-liquid mass transfer coefficients (k_La) in a bed of glass beads fluidized in non-Newtonian liquids with gas phase were measured. The gas hold-ups affecting gas-liquid mass transfer rate increased and decreased with increasing particle size and liquid velocity, respectively. The k_La coefficients were evaluated from the dynamic gassing-out method based on the tanks-in-series model describing non-ideal mixing in the three-phase fluidized bed. While an increase in the liquid velocity decreased the k_La coefficient, an increase in the particle size enhanced the k_La coefficient. The increase in purely viscous non-Newtonian flow behaviors reduced gas hold-up and gas-liquid mass transfer rate because of the bubble coalescing nature of the highly viscous non-Newtonian fluid. The theoretical models for 蠒_g and k_La in three-phase fluidized beds with non-Newtonian fluids were developed on the basis of the energy dissipation rate. They could reasonably fit the present experimental data.