Vogel and Patterson 



40- 



30- 



Drog 

 Reduction-gms 



0.25mm. Nose Slot 

 Flow rote - 30 ml/sec. 



Tunnel speed 

 600 cm/sec. 



— 500cm/sec. 



400cm/sec. 



300 cm/sec 



200 300 400 500 600 700 800 700 

 Polymer concentration - ports per million by weight. 



1000 



Fig. 12 - Drag reduction vs polymer concentration 

 for POLYOX WSR-301 



986 



