DOI QR코드

DOI QR Code

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

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.

Keywords

References

  1. Brandon, D.J., and Aggarwal, S.K. (2001). A numerical investigation of particle deposition on a square cylinder placed in a channel flow, Aerosol Science and Technology, 34, 340-352. https://doi.org/10.1080/02786820121279
  2. Braza, M., Chassaing, P., and Ha Minh, H. (1986). Numerical study and physical analysis of the pressure and velocity fields in the near wake of a circular cylinder, Journal of Fluid Mechanics, 165, 79-130. https://doi.org/10.1017/S0022112086003014
  3. Haugen, N.E.L., and Kragset, S. (2010). Particle impaction on a cylinder in a crossflow as function of Stokes and Reynolds numbers, Journal of Fluid Mechanics, 661, 239-261. https://doi.org/10.1017/S0022112010002946
  4. Lee, J. (2019). Performance test of MicroAeth® AE51 at concentrations lower than 2 ㎍/m3 in indoor laboratory, Applied Sciences, 9(13), 2766. https://doi.org/10.3390/app9132766
  5. Li, A., and Ahmadi, G. (1992). Dispersion and deposition of spherical particles from point sources in a turbulent channel flow, Aerosol Science and Technology, 16, 209-226. https://doi.org/10.1080/02786829208959550
  6. Morsi, S.A., and Alexander, A.J. (1972). An investigation of particle trajectories in two-phase flow systems, Journal of Fluid Mechanics, 55(2), 193-208. https://doi.org/10.1017/S0022112072001806
  7. Muhr, W. (1976). Theoretical and experimental investigation of particle deposition in fibrous filters by field and inertial forces, Ph.D. thesis, Institut fur Mechanische Verfahrenstechnik und Mechanik, Universitat, Karlsruhe, Germany.
  8. Park, J., Kwon, K., and Choi, H. (1998). Numerical solutions of flow past a circular cylinder at Reynolds numbers up to 160, KSME International Journal, 12(6), 1200-1205. https://doi.org/10.1007/bf02942594
  9. Sharman, B., Lien, F.S., Davidson, L., and Norberg, C. (2005). Numerical predictions of low Reynolds number flows over two tandem circular cylinders, International Journal for Numerical Methods in Fluids, 47, 423-447. https://doi.org/10.1002/fld.812
  10. Singha, S., and Sinhamahapatra, K.P. (2010). High-resolution numerical simulation of low Reynolds number incompressible flow about two cylinders in tandem, Journal of Fluids Engineering, Transactions of the ASME, 132, 011101. https://doi.org/10.1115/1.4000649
  11. Sumner, D. (2010). Two circular cylinders in cross-flow: A review, Journal of Fluids and Structures, 26, 849-899. https://doi.org/10.1016/j.jfluidstructs.2010.07.001
  12. Williamson, C.H.K. (1989). Oblique and parallel modes of vortex shedding in the wake of a circular cylinder at low Reynolds numbers, Journal of Fluid Mechanics, 206, 579-627. https://doi.org/10.1017/S0022112089002429
  13. Yao, J., Zhao, Y., Hu, G., Fan, J., and Cen, K. (2009). Numerical simulation of particle dispersion in the wake of a circular cylinder, Aerosol Science and Technology, 43, 174-187. https://doi.org/10.1080/02786820802549441