壁面附近的空隙率总是大于床层内部，因为阻力比较小，流体在近壁处的流速必大于床层内部，这种现象称为壁效应。壁面效应walleffect船舶在有限水域中航行时，周围固体壁面的存在对 船舶的航行性能产生的影响。
在近壁区范围内，采用壁函数技术解决壁面效应问题。
In the areas close to the boundary, the technique of wall function is adopted to solve the effect of the wall surface.
在实验结果的基础上，通过定义壁面修正因子考虑壁面效应的影响，得到了颗粒堆积多孔介质在小填充层数时流动阻力特性的准则关系式。
On the basis of the experimental results, the empirical correlation equation was determined by taking into account of the wall effect with a wall modified factor.
热泳力对粒径为50微米的颗粒也有影响，但是由于颗粒的质量较大，再加上壁面效应，其作用效果远没有2微米颗粒明显，仅在近壁区颗粒的浓度略有升高，而其它部分基本不变。
Although the thermophoresis force could affect the 50-micron particle, the concentration did not change as large as 2-micron particle because of the large mass and the wall effect.
应用推荐