Question

Eddy viscosity is a turbulent transfer of_________

(a) Fluid

(b) Heat

(c) Momentum

(d) Pressure

The question was asked during an interview for a job.

My question is from Turbulent Boundary Layer on a Flat Plate in section Boundary Layer Flow & Forces on Sub-merged Bodies of Fluid Mechanics

Answer 1

Right option is (c) Momentum

For explanation: Eddy viscosity is a turbulent transfer of momentum by eddies. It gives rise to an internal fluid friction. It is in analogous to the action of molecular viscosity in laminar fluid flow. Eddy viscosity takes place on a large scale.