Here is the link :
https://www.sciencedirect.com/...ii/S0141029617300974 But not available publicly, you have to pay. It is on tubular sections.
For my arms, left of the graph (8x10exp4 Reynolds) is equivalent to 42km/h.
This paper is available, on the "V" style vortex generator developed for London 2012 british athletes (running), and then used by Endura, for exemple on the suit used by Tim Don in Kona 2018 for exemple :
https://core.ac.uk/...oad/pdf/82244006.pdf When you look to Tim in Kona 2018 pictures, the V shapes are clearly visible on the sleeves.
Same way the stripes on Wurf (Castelli PR) or Lange (custom Fusion) sleeves, similar to the one studied on the graph I posted initially.
Typically these vortex generators are now banned by UCI. But not by WTC. And clearly you can do many things in the UCI 1mm irregularity limit :-)