Quantifying turbulence-induced segregation of inertial particles.
نویسندگان
چکیده
Particles with different density from the advecting turbulent fluids cluster due to the different response of light and heavy particles to turbulent fluctuations. This study focuses on the quantitative characterization of the segregation of dilute polydisperse inertial particles evolving in turbulent flow, as obtained from direct numerical simulation of homogeneous isotropic turbulence. We introduce an indicator of segregation amongst particles of different inertia and/or size, from which a length scale r_{seg}, quantifying the segregation degree between two particle types, is deduced.
منابع مشابه
Measuring segregation of inertial particles in turbulence by a full Lagrangian approach.
Preferential concentration of inertial particles in turbulence is studied numerically by evaluating the Lagrangian compressibility of the particle velocity field using the "full Lagrangian method." This is compared with the "mesoscopic Eulerian particle velocity field" both in a direct numerical simulation of turbulence and in a synthetic flow field. We demonstrate that the Lagrangian method, i...
متن کاملInertial particle segregation by turbulence.
We study collections of heavy and light small spherical particles initially well mixed with each other, subjected to linear (Stokes) drag force and gravity, and falling through a fluid turbulence. We introduce the segregation power spectrum, which we use to define the segregation length scale. Kinematic simulation predicts that the turbulence can segregate heavy and light falling particles and ...
متن کاملDynamics analysis of microparticles in inertial microfluidics for biomedical applications
Inertial microfluidics-based devices have recently attracted much interest and attention due to their simple structure, high throughput, fast processing and low cost. They have been utilised in a wide range of applications in microtechnology, especially for sorting and separating microparticles. This novel class of microfluidics-based devices works based on intrinsic forces, which cause micropa...
متن کاملSweep-stick mechanism of heavy particle clustering in fluid turbulence.
It is proposed that the inertial range clustering of small heavy particles in fluid turbulence occurs as a result of the sweep-stick mechanism which causes inertial particles to cluster so as to mimic the clusters of points where the fluid acceleration is perpendicular to the direction of highest contraction between neighboring particles. Direct numerical simulations of inertial particles subje...
متن کاملModulation of homogeneous turbulence seeded with finite size bubbles or particles
0301-9322/$ see front matter 2009 Elsevier Ltd. A doi:10.1016/j.ijmultiphaseflow.2009.11.001 * Corresponding author. Tel.: +1 401 863 1482; fax E-mail address: [email protected] (M.R. Max 1 Present address: Department of Mathematics, Purd IN 47907, USA. The dynamics of homogeneous, isotropic turbulence seeded with finite sized particles or bubbles is investigated in a series of numerical simu...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
- Physical review letters
دوره 101 8 شماره
صفحات -
تاریخ انتشار 2008