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Modulation on coherent vortex structures by dispersed solid particles in a three-dimensional mixing layer.

Jianren Fan1, Kun Luo, Youqu Zheng

  • 1Institute for Thermal Power Engineering and CE & EE, Zhejiang University, Hangzhou 310027, China. fanjr@mail.hz.zj.cn

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|October 4, 2003
PubMed
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Numerical simulations reveal that particle-laden turbulent free shear flows show modulated dynamics. Higher particle mass loading alters vortex structure evolution and enhances mixing, impacting industrial applications like combustion and pollution control.

Area of Science:

  • Fluid Dynamics
  • Turbulence
  • Particle Dispersion

Background:

  • Turbulent free shear flows are crucial in industrial processes like combustion and pollution control.
  • Understanding large-scale vortex structures and particle dispersion is key to optimizing these applications.

Purpose of the Study:

  • To numerically investigate the interaction between large-scale vortex structures and particle dispersion in a 3D mixing layer.
  • To analyze the effects of varying particle mass loading on flow dynamics and particle dispersion.

Main Methods:

  • Utilized a pseudospectral method for direct numerical simulation of the fluid flow.
  • Employed a Lagrangian approach to track particle movement.
  • Introduced computational particles to simulate varying mass loading and two-way coupling.

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Main Results:

  • Coherent structures remain dominant but are modulated by particles; vortex length shortens, and pairing is delayed.
  • Increased mass loading reduces fluid energy during Kelvin-Helmholtz rolling up but increases it during vortex pairing.
  • Higher mass loading leads to increased mixed fluid thickness and Reynolds stresses.
  • Particle dispersion differs in transverse and spanwise directions, indicating anisotropic effects on vortex structures.

Conclusions:

  • Particle addition significantly modulates large-scale vortex structures and particle dispersion in turbulent mixing layers.
  • Mass loading is a critical parameter influencing flow energy, mixing, and Reynolds stresses.
  • The anisotropic effects of particles on vortex structures highlight the complexity of particle-laden turbulent flows.