Print Email Facebook Twitter Universal scaling laws for dense particle suspensions in turbulent wall-bounded flows Title Universal scaling laws for dense particle suspensions in turbulent wall-bounded flows Author Simões Costa, P. (TU Delft Fluid Mechanics) Picano, Francesco (University of Padova) Brandt, Luca (KTH Royal Institute of Technology) Breugem, W.P. (TU Delft Multi Phase Systems; TU Delft Fluid Mechanics) Date 2016 Abstract The macroscopic behavior of dense suspensions of neutrally buoyant spheres in turbulent plane channel flow is examined. We show that particles larger than the smallest turbulence scales cause the suspension to deviate from the continuum limit in which its dynamics is well described by an effective suspension viscosity. This deviation is caused by the formation of a particle layer close to the wall with significant slip velocity. By assuming two distinct transport mechanisms in the near-wall layer and the turbulence in the bulk, we define an effective wall location such that the flow in the bulk can still be accurately described by an effective suspension viscosity. We thus propose scaling laws for the mean velocity profile of the suspension flow, together with a master equation able to predict the increase in drag as a function of the particle size and volume fraction. To reference this document use: http://resolver.tudelft.nl/uuid:fd89156a-6522-449b-aab6-d96093b5041c DOI https://doi.org/10.1103/PhysRevLett.117.134501 ISSN 0031-9007 Source Physical Review Letters, 117 (13) Part of collection Institutional Repository Document type journal article Rights © 2016 P. Simões Costa, Francesco Picano, Luca Brandt, W.P. Breugem Files PDF PhysRevLett.117.134501_1_.pdf 430.23 KB Close viewer /islandora/object/uuid:fd89156a-6522-449b-aab6-d96093b5041c/datastream/OBJ/view