Fully resolved simulation of single-particle dynamics in a microcavity
- 238 Downloads
Fluid flow laden with a single finite size neutrally buoyant particle over a confined microcavity adjacent to a main straight microchannel is numerically simulated by a fully resolved simulation method. This method is based on coupled immersed boundary–lattice Boltzmann method, which can directly resolve the fluid flow and the interactions between fluid and particles without any empirical models. The evolution of the fluid microvortex and the motions of the particle, such as trapping, orbiting, and rotating, in a confined microcavity are investigated as a function of Reynolds number ranging from 5 to 250. The results reveal that the topology structure of the microvortex changes from local apex ear, to globally crescentic and then triangle as Reynolds number increases. Three phases for particle stable and unstable entrapping behavior and four particle-trapping modes are observed and identified. The particle-trapping pathway varies from outer to inner, invariable, inner to outer, and inner to escape corresponding to different Reynolds numbers. The mechanisms for this phenomenon are revealed by a new improved competing model between outward centrifugal force and inward inertial lift force. Finally, the orbiting and rotating motion of the particle is quantitatively analyzed for the first time.
KeywordsParticle trapping Microvortex Lattice Boltzmann method Immersed boundary method
This work is supported by the National Natural Science Foundation of China (NSFC) (Grant nos. 51876075, 51876076) and the Foundation of State Key Laboratory of Coal Combustion (Grant no. FSKLCCA1802).
- Aidun CK, Clausen JR (2009) Lattice-Boltzmann method for complex flows. Annu Rev Fluid Mech 42:439–472. https://doi.org/10.1146/annurev-fluid-121108-145519 MathSciNetCrossRefzbMATHGoogle Scholar
- Jiang M, Liu Z (2018) A boundary thickening-based direct forcing immersed boundary method for fully resolved simulation of particle-laden flows. arXiv preprint: http://arxiv.org/abs/180609403
- Madou M, Zoval J, Jia G, Kido H, Kim J, Kim N (2006) Lab on a CD. Annu Rev Biomed Eng 8:601–628. https://doi.org/10.1146/annurev.bioeng.8.061505.095758 CrossRefGoogle Scholar
- Martel JM, Toner M (2014) Inertial focusing in microfluidics. Ann Rev Biomed Eng 16:371–396. https://doi.org/10.1146/annurev-bioeng-121813-120704 CrossRefGoogle Scholar
- Maxey M (2017) Simulation methods for particulate flows and concentrated suspensions. Annu Rev Fluid Mech 49:171–193. https://doi.org/10.1146/annurev-fluid-122414-034408 MathSciNetCrossRefzbMATHGoogle Scholar
- Mittal R, Iaccarino G (2005) Immersed boundary methods. Ann Rev Fluid Mech 37:239–261. https://doi.org/10.1146/annurev.fluid.37.061903.175743 MathSciNetCrossRefzbMATHGoogle Scholar
- Sun D-K, Wang Y, Dong A-P, Sun B-D (2016) A three-dimensional quantitative study on the hydrodynamic focusing of particles with the immersed boundary-Lattice Boltzmann method. Int J Heat Mass Transfer 94:306–315. https://doi.org/10.1016/j.ijheatmasstransfer.2015.11.012 CrossRefGoogle Scholar
- Zhang J, Li M, Li W, Alici G (2013) Investigation of trapping process in “Centrifuge-on-a-chip”. In: Advanced intelligent mechatronics (AIM), 2013 IEEE/ASME International Conference on IEEE, pp 1266–1271Google Scholar