Since if the frictional resistance coefficient is a function ofrelativeroughness, then the form resistance coefficient is independent of the Reynolds number.
若流线型物体表面的摩擦阻力系数仅为相对粗糙度的函数，则形状阻力系数与雷诺数无关。
2
The roughnesscoefficient increases when the relativeroughnessof the surface becomes larger under the same condition of discharge.