drag flow

基本解释

The drag of flow in pipes can be greatly reduced by adding a very small amount of high molecular polymer to water.
在清水里加入微量的高分子聚合物，可以大大降低管路阻力。
The differences of coefficient of drag of flow and convection heat transfer between sewage and clean water are analyzed.
并给出与清水相比，流动阻力增大与对流换热系数减小的幅度。
This article mainly describes the development status and prospects of computational fluid dynamics (CFD) concerning the drag and flow field in ship hydrodynamics.
本文着重评述船舶水动力学中有关阻力和流动领域计算流体力学（CFD）发展现状和前景。