Section: Fluid Mechanics | Marks: 1
For a two-dimensional turbulent boundary layer, the wall shear stress can be expressed as $\tau_w = \mu \frac{\partial u}{\partial y}\big|_{wall}$ where $u$ is the velocity parallel to the wall and $y$ is the coordinate perpendicular to the wall. In the above expression, $\mu$ denotes
- A. the molecular viscosity of the fluid
- B. the turbulent eddy viscosity
- C. an effective viscosity which is greater than the molecular viscosity
- D. an effective viscosity that is less than the molecular viscosity