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

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

Research output: Contribution to journalArticle

31 Citations (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.
Original languageEnglish
Pages (from-to)465-478
Number of pages14
JournalJournal of Fluid Mechanics
Volume739
Publication statusPublished - 2014

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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