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Applied Mathematics and Mechanics (English Edition) ›› 2009, Vol. 30 ›› Issue (11): 1379-1392.doi: https://doi.org/10.1007/s10483-009-1104-7

• Articles • 上一篇    下一篇

Large eddy simulation of hot and cold fluids mixing in a T-junction for predicting thermal fluctuations

朱维宇1 卢涛1 姜培学2 郭志军1 王奎升1   

  1. 1. School of Mechanical and Electrical Engineering, Beijing University of Chemical Technology, Beijing 100029, P. R. China;
    2. Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Thermal Engineering, Tsinghua University, Beijing 100084, P. R. China
  • 收稿日期:2009-03-03 修回日期:2009-09-10 出版日期:2009-12-02 发布日期:2009-11-01

Large eddy simulation of hot and cold fluids mixing in a T-junction for predicting thermal fluctuations

ZHU Wei-Yu1, LU Tao1, JIANG Pei-Xue2, GUO Zhi-Jun1, WANG Kui-Sheng1   

  1. 1. School of Mechanical and Electrical Engineering, Beijing University of Chemical Technology, Beijing 100029, P. R. China;
    2. Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Thermal Engineering, Tsinghua University, Beijing 100084, P. R. China
  • Received:2009-03-03 Revised:2009-09-10 Online:2009-12-02 Published:2009-11-01

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摘要： Temperature fluctuations in a mixing T-junction have been simulated on the FLUENT platform using the large eddy simulation (LES) turbulent flow model and a sub-grid scale Smagorinsky-Lilly model. The normalized mean and root mean square temperatures for describing time-averaged temperature and temperature fluctuation intensity, and the velocity are obtained. The power spectrum densities of temperature fluctuations, which are key parameters for thermal fatigue analysis and lifetime evaluation, are analyzed. Simulation results are consistent with experimental data published in the literature, showing that the LES is reliable. Several mixing processes under different conditions are simulated in order to analyze the effects of varying Reynolds number and Richardson number on the mixing course and thermal fluctuations.

关键词: numerical simulation, thermal fluctuation, T-junction, mixing

Abstract: Temperature fluctuations in a mixing T-junction have been simulated on the FLUENT platform using the large eddy simulation (LES) turbulent flow model and a sub-grid scale Smagorinsky-Lilly model. The normalized mean and root mean square temperatures for describing time-averaged temperature and temperature fluctuation intensity, and the velocity are obtained. The power spectrum densities of temperature fluctuations, which are key parameters for thermal fatigue analysis and lifetime evaluation, are analyzed. Simulation results are consistent with experimental data published in the literature, showing that the LES is reliable. Several mixing processes under different conditions are simulated in order to analyze the effects of varying Reynolds number and Richardson number on the mixing course and thermal fluctuations.

Key words: numerical simulation, thermal fluctuation, T-junction, mixing

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