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

Enrico Napoli, Barbara Milici, Mauro De Marchis, Gaetano Sardina

Risultato della ricerca: Articlepeer review

34 Citazioni (Scopus)

Abstract

Deposition and resuspension mechanisms in particle-laden turbulent flows aredominated by the coherent structures arising in the wall region. These turbulentstructures, which control the turbulent regeneration cycles, are affected by theroughness of the wall. The particle-laden turbulent flow in a channel boundedby irregular two-dimensional rough surfaces is analysed. The behaviour of dilutedispersions of heavy particles is analysed using direct numerical simulations (DNS)to calculate the three-dimensional turbulent flow and Lagrangian tracking to describethe turbophoretic effect associated with two-phase turbulent flows in a complex wallboundeddomain. Turbophoresis is investigated in a quantitative way as a function ofthe particle inertia. The analysis of the particle statistics, in term of mean particleconcentration and probability density function (p.d.f.) of wall-normal particle velocity,shows that the wall roughness produces a completely different scenario compared tothe classical smooth wall. The effect of the wall roughness on the particle mass flux isshown for six particle populations having different inertia.
Lingua originaleEnglish
pagine (da-a)465-478
Numero di pagine14
RivistaJournal of Fluid Mechanics
Volume739
Stato di pubblicazionePublished - 2014

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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