Skin friction drag, also known simply as skin drag or viscous drag, is a type of drag force experienced by an object moving through a fluid, such as air or water. It arises due to the frictional resistance between the fluid and the surface of the object.
Where:
- is the skin friction drag
- is the density of the fluid
- is the velocity of the object relative to the fluid
- is the skin friction coefficient
- is the reference area of the object