Shear stress in a turbulent flow is due to
Option (A)
The viscous property of the fluid
Option (B)
The fluid
Fluctuation of velocity in the direction of flow
Fluctuation of the velocity in the direction of flow as well as transverse to it
Correct Option:
Question Solution:
Due to continuous and quick fluctuations in velocity components in all the three directions, continuous mixing of liquid takes place in turbulent flow. This results in a lot of transfer of momentum which results in shear stresses in viscous shear stresses. The total shear is the sum of viscous shear and turbulent shear.
t = m(d`u/dy) + h.(d`u/dy)