中文摘要：

边界层内具有较大的速度梯度，即使黏度很小，产生的剪应力也不可忽略，流动、传热传质阻力都集中在该区域，因此边界层的厚度对传递过程有重要影响。壁面上的流动边界层沿流体主流方向逐渐增厚，其本质是动量传递的结果，即流体在垂直壁面方向上的动量传递距离在不断增加，但移动壁面的边界层发展规律与固定壁面的情况是否相同，教科书中尚未见到对比和讨论。本文对比了这两种边界层发展的异同点，并探讨了两者产生差异的原因。

英文摘要：

The velocity gradient obviously exists in fluid boundary layer. The resultant shear stress cannot be ignored even for a fluid with small viscosity. The flow, heat and mass transfer resistances also mainly exists in this area. Therefore the thickness of the boundary layer greatly affects transport processes. Flu- id boundary layer on a wall becomes thicker and thicker along the flow direction, which results from mo- mentum transfer, i.e. the distance of momentum transfer increases in the vertical direction of the wall. However, it has never been discussed or compared in textbooks whether the boundary layer development on a moving wall is as same as that on a fixed one. This paPer compares the similarities and differences between the two types of boundary layers and the underlying reasons are discussed.