Fluid Shear Stress

Definition - What does Fluid Shear Stress mean?

Fluid shear stress refers to the stress coplanar component along with a cross section of a material. This occurs due to the component’s force vector that is analogous to the cross section.

It is in contradiction to normal stress that arises from force vectors that are perpendicular to the material’s cross section, where it acts.

Corrosionpedia explains Fluid Shear Stress

Fluids that move along solid boundaries gain shear stress on that given boundary. In fact, "no-slip situation" indicates that the fluid speed relative to the boundary is regarded as zero. However, at some point from that boundary, the speed of flow should be identical to the fluid.

In a flow within a straight container or vessel, fluids do not move at identical velocity at each point within the vessel. In such a case, the flow of fluid is slowest near the wall of the vessel and quickest at its focal area. The velocity of fluid assumes a laminar-flow type of profile or "parabolic." This kind of flow is produced by the friction within the wall of the vessel and is associated with the viscosity of the fluid.

The friction produces a tangential force released by the flowing fluid, referred to as the fluid shear stress. The magnitude of this depends on the fluid velocity when moving from and around the vessel. The rate of this shear stress should be monitored and accurately measured to prevent stress, which causes corrosion.

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