9.1 A model of a river towboat is to be tested at 1:18 scale. The boat is designed to travel at 3.5 m/s in fresh water at 10 C. Estimate the distance from the bow where transition from a laminar to a turbulent boundary layer occurs. Determine the speed for the model boat so that transition occurs at the same relative position.

9.2 For a flow at 9.0 m/s over a smooth flat plate, estimate the maximum length of the laminar boundary layer for air and for water as the fluid.

9.3 The velocity profile for a turbulent boundary layer can be approximated by the power law expression

Evaluate the displacement thickness

and momentum thickness

for the profile. Determine the boundary conditions that are satisfied and not satisfied by this expression.

Transcribed Image Text:

L/1 n