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Effects of roughness on particle dynamics in turbulent channel flows: a DNS analysis

Published online by Cambridge University Press:  02 January 2014

Barbara Milici ,
Mauro De Marchis ,
Gaetano Sardina  and
Enrico Napoli
Barbara Milici
Affiliation:
Facoltà di Ingegneria, Architettura e delle Scienze Motorie, Università degli studi di Enna ‘Kore’, 94100 Enna, Italy
Mauro De Marchis*
Affiliation:
Facoltà di Ingegneria, Architettura e delle Scienze Motorie, Università degli studi di Enna ‘Kore’, 94100 Enna, Italy
Gaetano Sardina
Affiliation:
Facoltà di Ingegneria, Architettura e delle Scienze Motorie, Università degli studi di Enna ‘Kore’, 94100 Enna, Italy
Enrico Napoli
Affiliation:
Dipartimento di Ingegneria Civile, Ambientale, Aerospaziale e dei Materiali, Università degli Studi di Palermo, 90133 Palermo, Italy
*
†Email address for correspondence: mauro.demarchis@unikore.it
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Abstract

Deposition and resuspension mechanisms in particle-laden turbulent flows are dominated by the coherent structures arising in the wall region. These turbulent structures, which control the turbulent regeneration cycles, are affected by the roughness of the wall. The particle-laden turbulent flow in a channel bounded by irregular two-dimensional rough surfaces is analysed. The behaviour of dilute dispersions of heavy particles is analysed using direct numerical simulations (DNS) to calculate the three-dimensional turbulent flow and Lagrangian tracking to describe the turbophoretic effect associated with two-phase turbulent flows in a complex wall-bounded domain. Turbophoresis is investigated in a quantitative way as a function of the particle inertia. The analysis of the particle statistics, in term of mean particle concentration and probability density function (p.d.f.) of wall-normal particle velocity, shows that the wall roughness produces a completely different scenario compared to the classical smooth wall. The effect of the wall roughness on the particle mass flux is shown for six particle populations having different inertia.

JFM classification

Multiphase and Particle-laden Flows: Multiphase and Particle-laden Flows Turbulent Flows: Turbulent Flows
Type
Papers
Information
Journal of Fluid Mechanics , Volume 739 , 25 January 2014 , pp. 465 - 478
Copyright
©2013 Cambridge University Press 

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