Wall shear stress (WSS) is defined as the tangential force per unit area that is exerted by the flowing fluid on the surface of the conduit tube. ... This velocity gradient near the wall is termed wall shear rate.

What is wall shear stress and formula?

As we know, the shear stress can be calculated by the equation: shear stress=viscosity*du/dy (one dimensional flow) in a laminar flow.

What causes wall shear stress?

Shear stress is caused by the flow of fluid across the surface and its value is directly proportional to the velocity of the surrounding fluid [38]. With the lack of sensors, shear stress could only be approximated with use of CFD techniques.