Question

Newton's law for shear strain rate and shear stress for laminar flow

Answer 1

For all Newtonian fluids in laminar flow, the shear stress is proportional to the strain rate in the fluid, where the viscosity is the constant of proportionality. For non-Newtonian fluids, the viscosity is not constant. The shear stress is imparted onto the boundary as a result of this loss of velocity.

Derivations from other quantities: τ = F/A

Common symbols: τ

SI unit: pascal