Numerical simulation of micro-mixing in stirred reactors using the engulfment model coupled with CFD
文献类型：会议论文
| 作者 | Duan, Xiaoxia; Feng, Xin; Yang, Chao; Mao, Zai-Sha |
| 出版日期 | 1905-07-06 |
| 会议日期 | November 16, 2014 - November 21, 2014 |
| 会议地点 | Atlanta, GA, United states |
| 关键词 | Computational efficiency - Kinetics - Transport properties - Probability density function - Turbulence - Diffusion in liquids - Kinetic energy - Mixing - Mixtures - Numerical models - Tanks (containers) |
| 页码 | 46-53 |
| 英文摘要 | Stirred tanks are widely encountered in process industries, often used for complex and fast reactions such as reactive crystallization, nitrification and sulfonation. The yield and selectivity of desired products depend directly on the conditions of mixing on the molecular level. The micro-mixing simulations are being developed with improvement of computer capacity and application of computational fluid dynamics. The engulfment model (E-model) based on the turbulence promoted diffusion has been widely used. Owing to the computational efficiency and model simplicity, the E-model compared with other micro-mixing models based on the probability density function is more suitable for industrial scale reactors. However, the E-model does not contain the information about macro-mixing on the reactor scale and is only resolved in the Lagrangian frame perspective. In this paper, a CFD method combining with the E-model is presented and implemented to predict the micro-mixing effects on the course of parallel competing chemical reactions carried out in a semi-batch single phase stirred tank. The new modeling approach describes the small-scale segregation of fluid by solving the transport equations of mixture fraction and its variance based on the CFD simulation of the macro-flow, and then calculates the representative turbulence kinetic energy and dissipation in the reaction zone via the weighted average of the mixture-fraction variance for the E-model. The model predictions of segregation index at different agitation speeds and feeding locations are compared with the experimental results in satisfactory agreement. |
| 资助机构 | American Institute of Chemical Engineers |
| 会议录 | North American Mixing Forum 2014 - Core Programming Area at the 2014 AIChE Annual Meeting
 |
| 学科主题 | Computational Fluid Dynamics |
| 源URL | [http://ir.ipe.ac.cn/handle/122111/59293]  |
| 作者单位 | Institute of Process Engineering, Chinese Academy of Sciences, Beijing; 100190, China |
| 推荐引用方式 GB/T 7714 | Duan, Xiaoxia,Feng, Xin,Yang, Chao,et al. Numerical simulation of micro-mixing in stirred reactors using the engulfment model coupled with CFD[C]. 见:. Atlanta, GA, United states. November 16, 2014 - November 21, 2014. |
入库方式： OAI收割
来源：过程工程研究所
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