### Abstract

The effect of nonuniform seeding on the dispersion of heavy particles in a temporally evolving mixing layer has been investigated using simulation of the two-dimensional, incompressible Navier-Stokes equations. Mean-square dispersion and particle concentration were obtained from the trajectories of 20,000 particles. Particle Stokes numbers (St) in the calculations were 0.05, 1, and 10 where St is defined as the ratio of the particle time constant to large scale fluid time scale. Particles were initially distributed along the centerline, nonuniformity achieved by locating a greater fraction of particles near the saddle point of the layer. Consistent with previous experimental and numerical studies, particle dispersion following the development of the large scale roller is largest for St = 1, though in general the maximum dispersion is a function of both time and Stokes number. More importantly, it is shown that substantial increases—as large as a factor of 10—in particle dispersion can be obtained using nonuniform seedings relative to that obtained for an initially uniform distribution. It is also demonstrated that particle concentrations are substantially less peaked along the center of the layer for initially nonuniform seedings relative to uniform distributions.

Original language | English (US) |
---|---|

Title of host publication | 34th Aerospace Sciences Meeting and Exhibit |

Publisher | American Institute of Aeronautics and Astronautics Inc, AIAA |

ISBN (Print) | 9780000000002 |

State | Published - 1996 |

Externally published | Yes |

Event | 34th Aerospace Sciences Meeting and Exhibit, 1996 - Reno, United States Duration: Jan 15 1996 → Jan 18 1996 |

### Other

Other | 34th Aerospace Sciences Meeting and Exhibit, 1996 |
---|---|

Country | United States |

City | Reno |

Period | 1/15/96 → 1/18/96 |

### Fingerprint

### ASJC Scopus subject areas

- Space and Planetary Science
- Aerospace Engineering

### Cite this

*34th Aerospace Sciences Meeting and Exhibit*American Institute of Aeronautics and Astronautics Inc, AIAA.

**Particle transport in a nonuniformly seeded mixing layer.** / Wang, Q.; Squires, Kyle.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

*34th Aerospace Sciences Meeting and Exhibit.*American Institute of Aeronautics and Astronautics Inc, AIAA, 34th Aerospace Sciences Meeting and Exhibit, 1996, Reno, United States, 1/15/96.

}

TY - GEN

T1 - Particle transport in a nonuniformly seeded mixing layer

AU - Wang, Q.

AU - Squires, Kyle

PY - 1996

Y1 - 1996

N2 - The effect of nonuniform seeding on the dispersion of heavy particles in a temporally evolving mixing layer has been investigated using simulation of the two-dimensional, incompressible Navier-Stokes equations. Mean-square dispersion and particle concentration were obtained from the trajectories of 20,000 particles. Particle Stokes numbers (St) in the calculations were 0.05, 1, and 10 where St is defined as the ratio of the particle time constant to large scale fluid time scale. Particles were initially distributed along the centerline, nonuniformity achieved by locating a greater fraction of particles near the saddle point of the layer. Consistent with previous experimental and numerical studies, particle dispersion following the development of the large scale roller is largest for St = 1, though in general the maximum dispersion is a function of both time and Stokes number. More importantly, it is shown that substantial increases—as large as a factor of 10—in particle dispersion can be obtained using nonuniform seedings relative to that obtained for an initially uniform distribution. It is also demonstrated that particle concentrations are substantially less peaked along the center of the layer for initially nonuniform seedings relative to uniform distributions.

AB - The effect of nonuniform seeding on the dispersion of heavy particles in a temporally evolving mixing layer has been investigated using simulation of the two-dimensional, incompressible Navier-Stokes equations. Mean-square dispersion and particle concentration were obtained from the trajectories of 20,000 particles. Particle Stokes numbers (St) in the calculations were 0.05, 1, and 10 where St is defined as the ratio of the particle time constant to large scale fluid time scale. Particles were initially distributed along the centerline, nonuniformity achieved by locating a greater fraction of particles near the saddle point of the layer. Consistent with previous experimental and numerical studies, particle dispersion following the development of the large scale roller is largest for St = 1, though in general the maximum dispersion is a function of both time and Stokes number. More importantly, it is shown that substantial increases—as large as a factor of 10—in particle dispersion can be obtained using nonuniform seedings relative to that obtained for an initially uniform distribution. It is also demonstrated that particle concentrations are substantially less peaked along the center of the layer for initially nonuniform seedings relative to uniform distributions.

UR - http://www.scopus.com/inward/record.url?scp=84962138783&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84962138783&partnerID=8YFLogxK

M3 - Conference contribution

AN - SCOPUS:84962138783

SN - 9780000000002

BT - 34th Aerospace Sciences Meeting and Exhibit

PB - American Institute of Aeronautics and Astronautics Inc, AIAA

ER -