Flows wtth Drag Reductton (Veloetty and Frtctton) 
/ A’ = 350 
yt’? =19.0 log,,(Re f'*)-32.4 7 
300 
40 
30 
ae 
f 
20 
10 
y. 1 
if *=4.0 log, (Re ¢ 7)-0.4 
10? 10° Re f/2 10° 10° 10° 
: Seg , 9 
Fig. 8 Friction factor curves as a function of A . 
PS2k 
