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Effect of Sweep and Ejection Events on Particle Dispersion in Wall Bounded Turbulent Flows

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Abstract

This paper studies the sweep and ejection events in a channel flow with Re τ = 80 by using Direct Numerical Simulation (DNS). The effects of ejection and sweep events on the transport of fluid particles are analyzed separately through a quadrant technique. By analyzing trajectories of the particles released at different wall-normal locations, it is found that the particles from the ejection events mainly move upward while the particles from the sweep events move downward of the flow during short and intermediate diffusion time durations. Numerical results show that the effects of the ejection and sweep events on the mean displacement and the mean square dispersion remain for a long time, one-order of magnitude larger than the streamwise Lagrangian integral scales.

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Authors and Affiliations

  1. School of Mechanical Engineering, Shanghai Institute of Technology, Shanghai, 200235, China

    Jian-ping Luo

  2. Shanghai Key Laboratory of Mechanics in Energy Engineering and Shanghai Institute of Applied Mathematics and Mechanics, Shanghai University, Shanghai, 200072, China

    Zhi-ming Lu

  3. School of Science, Shanghai Institute of Technology, Shanghai, 200235, China

    Xiang Qiu

  4. Shanghai Institute of Technology, Shanghai, 200235, China

    Dong-mei Li & Yu-lu Liu

Authors
  1. Jian-ping Luo
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  2. Zhi-ming Lu
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  3. Xiang Qiu
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  4. Dong-mei Li
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  5. Yu-lu Liu
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Correspondence to Zhi-ming Lu.

Additional information

Project supported by the National Natural Science Foundation of China (Grant Nos. 11172179, 11102114), the Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry (Grant No. ZX2010-12), the Key Project of Shanghai Municipal Education Commission (Grant No. 11ZZ87) and the Shanghai Pujiang Program (Grant No. 08PJ1409100).

Biography: LUO Jian-ping (1964-), Female, Ph. D., Associate Professor

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Luo, Jp., Lu, Zm., Qiu, X. et al. Effect of Sweep and Ejection Events on Particle Dispersion in Wall Bounded Turbulent Flows. J Hydrodyn 24, 794–799 (2012). https://doi.org/10.1016/S1001-6058(11)60305-3

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  • DOI: https://doi.org/10.1016/S1001-6058(11)60305-3

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