What Is the No-Slip Condition in Fluid Dynamics?

Fluid dynamics is a very important area of engineering in which all the fundamental principles are explained to obtain useful fluid-based engineering systems. There are lots of engineering terms in fluid dynamics. One of them is the no-slip condition. 

No-Slip Condition in Fluid Flow

Velocity profile of a flow section.

The liquid and gas phases of materials are called fluids. In many engineering or natural systems, fluid flows around or through shapes such as pipes. In a fluid flow over a surface or inside a surface, there is no fluid flow at the contact surface between the fluid and the surface. The velocity of the fluid is 0 at that point. This phenomenon is called a no-slip condition in fluid dynamics. In the flux region right above the no-slip layer, fluid velocity starts to increase. This fluid velocity increases with getting far from the no-slip layer. Because of this phenomenon, a boundary layer takes place. And velocity profile of the fluid takes place in the boundary layer. The velocity profile of s fluid depends on the viscosity of the fluid. 

Surface Drag

Because of this boundary layer phenomenon, there will be a force occurrence on the surface of the fluid flow and the material which is called surface drag force. This drag force is also called skin friction drag

Flow Separation

Flow separation over an airfoil(Image Source: Wikipedia).

If the flow surface comes to an end, there will be a flow separation region at the tip section of the surface because of the boundary layer. This flow separation phenomenon is strictly studied in the design of aircraft wings and other surfaces that external air flows upon. 


The general explanation of originating fluid mechanics terms thanks to the no-slip condition phenomenon can be explained like above. 

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