Formula for shear stress (τ) according to Newtons law of viscosity - Heat Transfer

Q.  What is the correct formula for the shear stress (τ) in a flowing fluid according to the Newton's law of viscosity?

Where,
μ = absolute viscosity of the flowing fluid
(du / dy) = change in velocity of a layer per unit change in distance of that layer from the surface
A = area of the surface on which the fluid is flowing
- Published on 11 Aug 15

a. (τ) = (1 / μ) (du / dy)
b. (τ) = μ (du / dy)
c. (τ) = μ A (du / dy)
d. none of the above

ANSWER: (τ) = μ (du / dy)

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