Question

0.27 Velocity gradient is - velocity per unit
perpendicular​

Answer 1

Answer:

n other words a velocity gradient is established throughout the layers. x is the distance perpendicular to the surface. In order to make relationship 5.1 into an equation a constant of proportionality is required, i.e. when η is termed the coefficient of viscosity (or more usually “the viscosity” of the fluid).

Answer 2

Explanation:

By definition of Tangential force which is equal to the product of coefficient of viscosity, velocity gradient and area.

i.e F

T

=ηA

dX

dV

So,

A

F

T

=η(1)

Therefore, the tangential force per unit area of the liquid layer required to maintain unit velocity gradient is known as Coefficient of viscosity of the liquid.