SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2019, Vol. 27 ›› Issue (1): 10-20.DOI: 10.1016/j.cjche.2018.04.006

• Fluid Dynamics and Transport Phenomena • 上一篇    下一篇

PIV experiment and large eddy simulation of turbulence characteristics in a confined impinging jet reactor

Miao Liu, Zhengming Gao, Yongjiu Yu, Zhipeng Li, Jing Han, Ziqi Cai, Xiongbing Huang   

  1. State Key Laboratory of Chemical Resource Engineering, School of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China
  • 收稿日期:2017-12-27 修回日期:2018-03-27 出版日期:2019-01-28 发布日期:2019-01-31
  • 通讯作者: Zhipeng Li, Jing Han
  • 基金资助:

    Supported by the National Key R&D Program of China (2017YFB0306701).

PIV experiment and large eddy simulation of turbulence characteristics in a confined impinging jet reactor

Miao Liu, Zhengming Gao, Yongjiu Yu, Zhipeng Li, Jing Han, Ziqi Cai, Xiongbing Huang   

  1. State Key Laboratory of Chemical Resource Engineering, School of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China
  • Received:2017-12-27 Revised:2018-03-27 Online:2019-01-28 Published:2019-01-31
  • Contact: Zhipeng Li, Jing Han
  • Supported by:

    Supported by the National Key R&D Program of China (2017YFB0306701).

摘要: Confined impinging jet reactor (CIJR) is a typical process intensification device used in the chemical industry. In this study, two dimensional Particle Image Velocimetry (PIV) and Large Eddy Simulation (LES) method were used to investigate the flow field in a CIJR with jets of diameter 3 mm under highly turbulent condition. The results showed LES can predict the velocity and Turbulence Kinetic Energy (TKE) distributions in the reactor well by comparing with the PIV results. In the CIJR, the stagnation point fluctuates with the turbulence, and its instantaneous position accords with the normal distribution. Three methods, including s-t representation, Lumley-Newman triangle and A-G representation, were used to compare the turbulence anisotropy in the mixing chamber. It was found that the anisotropy in the impinging area and at the edge of impinging jet was strong and the maximum deviation was up to 40%. The results from 2D PIV would lead to an overestimation of the turbulent kinetic energy as much as 20% to 30% than the results from the three dimensional numerical simulation.

关键词: PIV, LES, Turbulent kinetic energy, Pseudo-isotropic assumption

Abstract: Confined impinging jet reactor (CIJR) is a typical process intensification device used in the chemical industry. In this study, two dimensional Particle Image Velocimetry (PIV) and Large Eddy Simulation (LES) method were used to investigate the flow field in a CIJR with jets of diameter 3 mm under highly turbulent condition. The results showed LES can predict the velocity and Turbulence Kinetic Energy (TKE) distributions in the reactor well by comparing with the PIV results. In the CIJR, the stagnation point fluctuates with the turbulence, and its instantaneous position accords with the normal distribution. Three methods, including s-t representation, Lumley-Newman triangle and A-G representation, were used to compare the turbulence anisotropy in the mixing chamber. It was found that the anisotropy in the impinging area and at the edge of impinging jet was strong and the maximum deviation was up to 40%. The results from 2D PIV would lead to an overestimation of the turbulent kinetic energy as much as 20% to 30% than the results from the three dimensional numerical simulation.

Key words: PIV, LES, Turbulent kinetic energy, Pseudo-isotropic assumption