Quote:
Originally Posted by Bicycle Bob
Surface treatments do not affect the Reynold's number.
Helmet aerodynamics is a well-studied specialty, funded for the Olympics, and the design using a boundary-layer turbulator near the maximum diameter, with laminar flow from there forward to the stagnation point is a well-known classic design to deal with length limitations.
|
Bob,you are correct.
I should have said that the roughening would allow the transition to turbulent boundary layer at the lower Reynolds number.
As would a wire trip-strip,as demonstrated by Prandtl.