### Abstract

Lingua originale | English |
---|---|

pagine (da-a) | 465-478 |

Numero di pagine | 14 |

Rivista | Default journal |

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

### Cita questo

*Default journal*,

*739*, 465-478.

**Effects of roughness on particle dynamics in turbulent channel flows: a DNS analysis.** / Napoli, Enrico; Milici, Barbara; De Marchis, Mauro; Sardina, Gaetano.

Risultato della ricerca: Article

*Default journal*, vol. 739, pagg. 465-478.

}

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 - Default journal

JF - Default journal

ER -