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首页> 外文会议>Italian Conference on Chemical and Process Engineering(ICheaP-6) vol.2; 20030608-11; Pisa(IT) >Transfer, Segregation and Deposition of Heavy Particles in Horizontal and Vertical Turbulent Channel Flows
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Transfer, Segregation and Deposition of Heavy Particles in Horizontal and Vertical Turbulent Channel Flows

机译：水平和垂直湍流通道中重颗粒的转移，分离和沉积

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摘要

Particle transfer in the wall region of turbulent boundary layers is dominated by coherent structures which ⅰ) control the turbulence regeneration cycle, ⅱ) bring particles toward and away from the wall and ⅲ) favour particle segregation in the viscous region giving rise to nonuniform particle distribution profiles which peak close to the wall. In this work, we focus on the transfer mechanism of inertial particles and on the influence of gravity on transfer, segregation and deposition mechanisms. By tracking O(10~5) particles in Direct Numerical Simulation (DNS) of a turbulent channel flow at Re_τ = 150, we find that particles reach the wall mainly by two different mechanisms: free-flight, stronger for larger particles, and diffusional deposition, more significant for smaller particles. For dominant diffusional deposition, particles are segregated very near the wall and are then slowly driven to the wall.
机译：湍流边界层壁区域中的颗粒转移以相干结构为主导，structures）控制湍流再生周期，ⅱ）使颗粒进入和离开壁，ⅲ）促进粘性区域中的颗粒偏析，导致颗粒分布不均匀轮廓接近墙壁。在这项工作中，我们着重研究惯性粒子的传递机理，以及重力对传递，离析和沉积机理的影响。通过在Re_τ= 150的湍流通道流的直接数值模拟（DNS）中跟踪O（10〜5）粒子，我们发现粒子主要通过两种不同的机制到达壁：自由飞行，较大粒子更强和扩散沉积，对于较小的颗粒更重要。对于主要的扩散沉积，颗粒非常靠近壁被隔离，然后缓慢地被驱动到壁上。

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