Mixing times in single andmulti-orifice-impinging transverse (MOIT) jet mixers with crossflow

doi:10.1016/j.cjche.2016.01.018

›› 2016, Vol. 24 ›› Issue (7): 825-831.DOI: 10.1016/j.cjche.2016.01.018

• Fluid Dynamics and Transport Phenomena • 下一篇

Mixing times in single andmulti-orifice-impinging transverse (MOIT) jet mixers with crossflow

Peicheng Luo¹, Yuncui Tai¹, Yi Fang¹, Hua Wu²

1 School of Chemistry & Chemical Engineering, Southeast University, Nanjing 211189, China;
2 Institute for Chemical and Bioengineering, Department of Chemistry and Applied Bioscience, ETH Zurich, 8093 Zurich, Switzerland

收稿日期:2015-07-02 修回日期:2015-12-07 出版日期:2016-07-28 发布日期:2016-08-17
通讯作者: Peicheng Luo, Hua Wu
基金资助:
Supported by the National Natural Science Foundation of China (21476048, 21006011) and the Fundamental Research Funds for the Central University (104.205.2.5).

Mixing times in single andmulti-orifice-impinging transverse (MOIT) jet mixers with crossflow

Peicheng Luo¹, Yuncui Tai¹, Yi Fang¹, Hua Wu²

1 School of Chemistry & Chemical Engineering, Southeast University, Nanjing 211189, China;
2 Institute for Chemical and Bioengineering, Department of Chemistry and Applied Bioscience, ETH Zurich, 8093 Zurich, Switzerland

Received:2015-07-02 Revised:2015-12-07 Online:2016-07-28 Published:2016-08-17
Supported by:
Supported by the National Natural Science Foundation of China (21476048, 21006011) and the Fundamental Research Funds for the Central University (104.205.2.5).

摘要/Abstract

摘要： We study the macromixing behavior of single and multi-orifice-impinging transverse (MOIT) jet mixers with crossflow, in particular, the overall mixing time and the back-splash mixing time of the injected flow with the crossflow, using the PLIF technique. It is found that for a given mixer configuration, there is a critical jet-tocrossflow velocity ratio r_c at which the back-splash begins to occur. Further increase in the velocity ratio r leads to sharp increase in the back-splash mixing time, which can offset the intensification of the downstream mixing. The dimensionless overall mixing time decreases as r increases to reach either a plateau or a local minimum, and the corresponding r value represents the optimal velocity ratio r_opt for the macromixing. The momentumratio of the two liquid streams is a key factor determining r_c and r_opt. For a larger scale mixer, a higher momentum ratio is required to achieve the optimal macromixing with the minimum dimensionless overall mixing time.

关键词: Mixing, Chemical reactors, Mixing time, Jet mixer, Planar laser induced fluorescence (PLIF)

Abstract: We study the macromixing behavior of single and multi-orifice-impinging transverse (MOIT) jet mixers with crossflow, in particular, the overall mixing time and the back-splash mixing time of the injected flow with the crossflow, using the PLIF technique. It is found that for a given mixer configuration, there is a critical jet-tocrossflow velocity ratio r_c at which the back-splash begins to occur. Further increase in the velocity ratio r leads to sharp increase in the back-splash mixing time, which can offset the intensification of the downstream mixing. The dimensionless overall mixing time decreases as r increases to reach either a plateau or a local minimum, and the corresponding r value represents the optimal velocity ratio r_opt for the macromixing. The momentumratio of the two liquid streams is a key factor determining r_c and r_opt. For a larger scale mixer, a higher momentum ratio is required to achieve the optimal macromixing with the minimum dimensionless overall mixing time.

Key words: Mixing, Chemical reactors, Mixing time, Jet mixer, Planar laser induced fluorescence (PLIF)

Peicheng Luo, Yuncui Tai, Yi Fang, Hua Wu. Mixing times in single andmulti-orifice-impinging transverse (MOIT) jet mixers with crossflow[J]. , 2016, 24(7): 825-831.

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Mixing times in single andmulti-orifice-impinging transverse (MOIT) jet mixers with crossflow

Mixing times in single andmulti-orifice-impinging transverse (MOIT) jet mixers with crossflow

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