Question

The size of eddy is proportional to the streamline flow.

(a) True

(b) False

This question was posed to me in quiz.

I would like to ask this question from Role of Diffusion in Bioprocessing in section Mass Transfer of Bioprocess Engineering

Answer 1

The correct option is (b) False

Easy explanation: Turbulence in fluids produces bulk mixing on a scale equal to the smallest eddy size. Within the smallest eddies, flow is largely streamline so that further mixing must occur by diffusion of fluid components. Mixing on a molecular scale therefore relies on diffusion as the final step in the mixing process.