Abstract
| Lingua originale | English |
|---|---|
| pagine (da-a) | 465-478 |
| Numero di pagine | 14 |
| Rivista | Journal of Fluid Mechanics |
| Volume | 739 |
| Stato di pubblicazione | Published - 2014 |
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All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering
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Effects of roughness on particle dynamics in turbulent channel flows: a DNS analysis. / Napoli, Enrico; Milici, Barbara; De Marchis, Mauro; Sardina, Gaetano.
In: Journal of Fluid Mechanics, Vol. 739, 2014, pag. 465-478.Risultato della ricerca: Article
}
TY - JOUR
T1 - Effects of roughness on particle dynamics in turbulent channel flows: a DNS analysis
AU - Napoli, Enrico
AU - Milici, Barbara
AU - De Marchis, Mauro
AU - Sardina, Gaetano
PY - 2014
Y1 - 2014
N2 - 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.
AB - 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.
UR - http://hdl.handle.net/10447/100698
M3 - Article
VL - 739
SP - 465
EP - 478
JO - Journal of Fluid Mechanics
JF - Journal of Fluid Mechanics
SN - 0022-1120
ER -