Abstract
Understanding the behaviour of particles entrained in a fluid flow upon changes in flow direction is crucial in problems where particle inertia is important, such as the erosion process in pipe bends. We present results on the impact of particles in a T-shaped channel in the laminar-turbulent transitional regime. The impacting event for a given system is described in terms of the Reynolds number and the particle Stokes number. Experimental results for the impact are compared with the trajectories predicted by theoretical particle-tracing models for a range of configurations to determine the role of the viscous boundary layer in retarding the particles and reducing the rate of collision with the substrate. In particular, a two-dimensional model based on a stagnation-point flow is used together with three-dimensional numerical simulations. We show how the simple two-dimensional model provides a tractable way of understanding the general collision behaviour, while more advanced three-dimensional simulations can be helpful in understanding the details of the flow. © 2013 Cambridge University Press.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 236-255 |
| Number of pages | 20 |
| Journal | Journal of Fluid Mechanics |
| Volume | 727 |
| DOIs | |
| State | Published - Aug 23 2013 |
| Externally published | Yes |
Bibliographical note
KAUST Repository Item: Exported on 2020-10-01Acknowledged KAUST grant number(s): KUK-C1-013-04
Acknowledgements: The authors gratefully acknowledge helpful discussions with A. M. Lock, M. Taroni and D. Vella, and thank the Princeton Plasma Physics Laboratory (PPPL), in particular P. Heitzenroeder, M. Kalish, C. Neumeyer and M. Mardenfeld for inspiration and conversation. I.M.G. thanks Award No. KUK-C1-013-04, made by King Abdullah University of Science and Technology (KAUST) for support. S.R. acknowledges funding through project J-3072 of the Austrian Science Foundation. D.V. and H.A.S. thank the Princeton Environmental Institute via the Grand Challenges Program at Princeton University for partial support of this work.
This publication acknowledges KAUST support, but has no KAUST affiliated authors.