Particle and aerosol research (한국입자에어로졸학회지)

Korean Association for Particle and Aerosol Research (한국입자에어로졸학회)
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Simulation of fluid flow and particle transport around two circular cylinders in tandem at low Reynolds numbers

낮은 레이놀즈 수에서 두 개의 원형 실린더 주위 유동 및 입자 거동 해석

  • Khalifa, Diaelhag Aisa Hamid (Dept. of Mechanical Engineering, Kumoh National Institute of Technology) ;
  • Jeong, S. (Dept. of Mechanical Engineering, Kumoh National Institute of Technology) ;
  • Kim, D. (Dept. of Mechanical Engineering, Kumoh National Institute of Technology)
  • ;
  • 정석민 (금오공과대학교 기계공학과) ;
  • 김동주 (금오공과대학교 기계공학과)
  • Received : 2021.10.06
  • Accepted : 2021.10.20
  • Published : 2021.12.31
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Abstract

Understanding particle-laden flow around cylindrical bodies is essential for the better design of various applications such as filters. In this study, laminar flows around two tandem cylinders and the motions of particles in the flow are numerically investigated at low Reynolds numbers. We aim to reveal the effects of the spacing between cylinders, Reynolds number and particle Stokes number on the characteristics of particle trajectories. When the cylinders are placed close, the unsteady flow inside the inter-cylinder gap at Re = 100 shows a considerable modification. However, the steady recirculation flow in the wake at Re = 10 and 40 shows an insignificant change. The change in the flow structure leads to the variation of particle dispersion pattern, particularly of small Stokes number particles. However, the dispersion of particles with a large Stokes number is hardly affected by the flow structure. As a result, few particles are observed in the cylinder gap regardless of the cylinder spacing and the Reynolds number. The deposition efficiency of the upstream cylinder shows no difference from that of a single cylinder, increasing as the Stokes number increases. However, the deposition on the downstream cylinder is found only at Re = 100 with large spacing. At this time, the deposition efficiency is generally small compared to that of an upstream cylinder, and the deposition location is also changed with no deposited particles near the stagnation point.

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References

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