Quantifying turbulence induced segregation of inertial particles

行波流中的惯性粒子动力学

Inertial Particle Dynamics in Traveling Wave Flow

本文研究行波流中惯性粒子的拉格朗日动力学，通过计算FTLE和iFTLE揭示重粒子被吸引至FTLE脊线而轻粒子被排斥，为污染物输运和混合优化提供理论依据。

Quantifying microbubble clustering in turbulent flow from single-point measurements

Single-point hot-wire measurements in the bulk of a turbulent channel have been performed in order to detect and quantify the phenomenon of preferential bubble accumulation. We show that statistical analysis of the bubble-probe colliding-times series can give a robust method for investigation of clustering in the bulk regions of a turbulent flow where, due to the opacity of the flow, no imaging technique can be employed. We demonstrate that micro-bubbles (radius R_0 ~ 0.1 mm) in a developed turbulent flow, where the Kolmogorov length-scale is, eta ~ R_0, display preferential concentration in s…

纤维的弹性更偏好湍流的混沌

Elasticity of fibres prefers the chaos of turbulence

本文研究惯性弹性纤维在湍流中的优先采样行为，揭示惯性与弹性的竞争效应及其在大参数下的反转，并通过李雅普诺夫指数量化采样区域的混沌特性。

Particle-laden two-dimensional elastic turbulence

The aggregation properties of heavy inertial particles in the elastic turbulence regime of an Oldroyd-B fluid with periodic Kolmogorov mean flow are investigated by means of extensive numerical simulations in two dimensions. Both the small and large scale features of the resulting inhomogeneous particle distribution are examined, focusing on their connection with the properties of the advecting viscoelastic flow. We find that particles preferentially accumulate on thin highly elastic propagating waves and that this effect is largest for intermediate values of particle inertia. We provide a qua…