Influence of impeller diameter on local gas dispersion properties in a sparged multi-impeller stirred tank

doi:10.1016/j.cjche.2014.12.006

Chinese Journal of Chemical Engineering ›› 2015, Vol. 23 ›› Issue (4): 615-622.DOI: 10.1016/j.cjche.2014.12.006

Influence of impeller diameter on local gas dispersion properties in a sparged multi-impeller stirred tank

Yuyun Bao, Jie Yang, Bingjie Wang, Zhengming Gao

State Key Laboratory of Chemical Resource Engineering, School of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China

收稿日期:2013-12-24 修回日期:2014-03-24 出版日期:2015-04-28 发布日期:2015-05-13
通讯作者: Zhengming Gao
基金资助:
Supported by the National Natural Science Foundation of China (21121064,21206002,21376016)

Influence of impeller diameter on local gas dispersion properties in a sparged multi-impeller stirred tank

Yuyun Bao, Jie Yang, Bingjie Wang, Zhengming Gao

State Key Laboratory of Chemical Resource Engineering, School of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China

Received:2013-12-24 Revised:2014-03-24 Online:2015-04-28 Published:2015-05-13
Contact: Zhengming Gao
Supported by:
Supported by the National Natural Science Foundation of China (21121064,21206002,21376016)

摘要/Abstract

摘要： Vertical distributions of local void fraction and bubble size in air-water dispersion system were measured with a dual conductivity probe in a fully baffled dished base stirred vessel with the diameter T of 0.48 m, holding 0.134m³ liquid. The impeller combination with a six parabolic blade disk turbine below two down-pumping hydrofoil propellers, identified as PDT+2CBY, was used in this study. The effects of the impeller diameter D, ranging from 0.30T to 0.40T (corresponding to D/T from 0.30 to 0.40), on the local void fraction and bubble size were investigated by both experimental and CFD simulation methods. At low superficial gas velocity V_S of 0.0077 m·s^-1, there is no obvious difference in the local void fraction distribution for all systems with different D/T. However, at high superficial gas velocity, the systemwith a D/T of 0.30 leads to higher local void fraction than systems with other D/T. There is no significant variation in the axial distribution of the Sauter mean bubble size for all the systems with different D/T at the same gas superficial velocity. CFD simulation based on the two-fluid model alongwith the population balancemodel (PBM)was used to investigate the effect of the impeller diameter on the gas-liquid flows. The local void fraction predicted by the numerical simulation approach was in reasonable agreement with the experimental data.

关键词: Impeller diameter, Local void fraction, Bubble size, CFD-PBM, Mixing

Abstract: Vertical distributions of local void fraction and bubble size in air-water dispersion system were measured with a dual conductivity probe in a fully baffled dished base stirred vessel with the diameter T of 0.48 m, holding 0.134m³ liquid. The impeller combination with a six parabolic blade disk turbine below two down-pumping hydrofoil propellers, identified as PDT+2CBY, was used in this study. The effects of the impeller diameter D, ranging from 0.30T to 0.40T (corresponding to D/T from 0.30 to 0.40), on the local void fraction and bubble size were investigated by both experimental and CFD simulation methods. At low superficial gas velocity V_S of 0.0077 m·s^-1, there is no obvious difference in the local void fraction distribution for all systems with different D/T. However, at high superficial gas velocity, the systemwith a D/T of 0.30 leads to higher local void fraction than systems with other D/T. There is no significant variation in the axial distribution of the Sauter mean bubble size for all the systems with different D/T at the same gas superficial velocity. CFD simulation based on the two-fluid model alongwith the population balancemodel (PBM)was used to investigate the effect of the impeller diameter on the gas-liquid flows. The local void fraction predicted by the numerical simulation approach was in reasonable agreement with the experimental data.

Key words: Impeller diameter, Local void fraction, Bubble size, CFD-PBM, Mixing

Yuyun Bao, Jie Yang, Bingjie Wang, Zhengming Gao. Influence of impeller diameter on local gas dispersion properties in a sparged multi-impeller stirred tank[J]. Chinese Journal of Chemical Engineering, 2015, 23(4): 615-622.

Yuyun Bao, Jie Yang, Bingjie Wang, Zhengming Gao. Influence of impeller diameter on local gas dispersion properties in a sparged multi-impeller stirred tank[J]. Chin.J.Chem.Eng., 2015, 23(4): 615-622.

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Influence of impeller diameter on local gas dispersion properties in a sparged multi-impeller stirred tank

Influence of impeller diameter on local gas dispersion properties in a sparged multi-impeller stirred tank

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