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首页> 外文期刊>International Journal of Heat and Mass Transfer >The effect of stable stratification and thermophoresis on fine particle deposition in a bounded turbulent flow
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The effect of stable stratification and thermophoresis on fine particle deposition in a bounded turbulent flow

机译：稳定分层和热泳对有限湍流中细颗粒沉积的影响

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摘要

Small inertial particle transfer and deposition in a thermally stratified turbulent channel flow is studied by large eddy simulation. The Lagrangian tracking approach is used to describe the dynamics of particles. The objective of this study is to examine the influences of thermal stratification and the thermophoresis on the preferential concentration and deposition of small particles with different particle relaxation time scales. The diameters of particle are ranged from 0.6 urn to 5 u.m. Numerical results show that the thermophoresis strengthens the deposition of particles near the cold wall while it weakens the deposition near the hot wall. With the Richardson number increases, the particle mean velocity increases regularly in the core of the channel, and the particle fluctuation intensities decrease due to the re-laminarization tendency of stably stratified turbulent boundary layer. The magnitude of the thermophoretic force on particles decreases in the stable stratified flow, which results in smaller deposition rate with increasing the Richardson number.
机译：通过大涡模拟研究了热分层湍流通道中的小惯性粒子转移和沉积。拉格朗日跟踪方法用于描述粒子的动力学。本研究的目的是研究热分层和热泳对具有不同粒子弛豫时间尺度的小粒子的优先浓度和沉积的影响。颗粒的直径为0.6微米至5微米。数值结果表明，热泳增强了冷壁附近的颗粒沉积，而减弱了热壁附近的颗粒沉积。随着Richardson数的增加，通道中心的粒子平均速度有规律地增加，并且由于稳定分层的湍流边界层的再分层趋势，粒子起伏强度减小。在稳定的分层流中，粒子上的热泳力的大小减小，这导致随着Richardson数的增加而减小了沉积速率。

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