Transport of particles in a turbulent rough-wall pipe flow
L Chan, T Zahtila, A Ooi, J Philip
Journal of Fluid Mechanics | Cambridge University Press (CUP) | Published : 2021
Dense, small particles suspended in turbulent smooth-wall flow are known to migrate towards the wall. It is, however, not clear if the particle migration continues in a rough-wall flow and what the responsible mechanism is, especially with changing roughness parameters. Here, we address this using direct numerical simulation of a turbulent pipe flow of a fixed friction Reynolds numbers and changing the roughness size as well as the Stokes number of the particles. The transport and deposition mechanisms of particles are segregated into three different regimes dictated by the Stokes number. Particles with small Stokes number follow the carrier fluid and are affected by the turbulent structures..View full abstract
This work was supported by computational resources provided by the Australian Government through NCI and Pawsey under the National Computational Merit Allocation Scheme and also by Pawsey's Energy and Resources Merit Allocation Scheme. The authors gratefully acknowledge the financial support from the Australian Research Council.