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
- Mechanical Engineering
- Mechanics of Materials
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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 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 wallbounded 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.
AB - 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 wallbounded 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.
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 -