For a Newtonian fluid the shear stress is proportional to wh

For a Newtonian fluid, the shear stress is proportional to what? For a fluid element at rest, the forces acting 011 the element are? In low speed flow through a diffuser, the pressure does what with the direction of the flow? Consider steady flow along a streamline. If the flow satisfies the conditions necessary for the Bernoulli equation, which pressure has a constant value along the streamline? The laminar velocity profile for Newtonian fluid is shown below in Figure 1: How does shear stress behave with respect to y?

Solution

A) in a Newtonian fluid the shear stress is proportional to rate of shear strain

B)for a fluid element at rest, the forces acting on element are to be equilibrium I.e the sum of components of forces at any direction is equal to zero.

C)in low speed flow through a diffuser the pressure is always normal to the direction of flow n is compressible

D) the stagnation pressure or total pressure is constant

E)shear stress = (dynamic voscosity)* (du/dy)