--- In TeslaTurbine@y..., "wyzed" <wyzed@f...> wrote:
> Tom, Smooth helps the boundary layer stick. Rough will cause
> and disturb the adhesive aspect of the boundary layer. Telsa
> in one of his many papers, I think it was in " Tesla's Engine A
> Dimension for Power. complied by Jeffery A Hayes available at TEBA.
Tesla was a genius and so he may be correct, however:
1) a rough surface should cause turbulent and not laminar or smooth
2) Since the goal of a turbine is to essentially cause "friction"
between the surface and the working fluid or gas, one could also
argue that the more roughness the better.
3) On page 68 of "Performance of Multiple-disk-rotors Pumps with
Varied Interdisk Spacings", by Joseph H. Morris, "Significant
increases in pressure rise were noted fo the roughened as compared to
smooth disks." Also "Improved pumping performance was noted with the
roughened disks as shown in Tables..."