针对微细颗粒在壁面上的沉积特性,采用湍流雷诺应力模型结合颗粒拉格朗日轨道模型对无量纲弛豫时间τ+为0.1～100量级的微细颗粒在壁面的沉积特性进行了研究,考查了流动方式和流速对颗粒沉积速率的影响.研究表明:在垂直向下流动和水平流动情况下,颗粒的沉积速率随着颗粒无量纲弛豫时间τ+增加而增加,但是垂直向下流动中,当颗粒无量纲弛豫时间τ+增大到一定值,颗粒的沉积速率基本保持定值.对于相同无量纲弛豫时间τ+的颗粒,颗粒在壁面上的沉积速率随着摩擦速度u*的增加而减少.
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