Flows with Drag Reductton (Veloctty and Frtctton) 
UpStale 250 Wee. | 
e 0.18"ID 
4 0.416" ID 
\ 
\ 
\\ 
\\\\ 
\\\\ 
ReVit 
Fig.11 Measurements of friction coefficients. 
AP-30 100 W.PP.M. 
4 0.416 ID 
@® 1.624 ID 
Oe 
.e) 
0 
0 
ie) 
0 
6 
10 10? 10° 10° 
Fig.12 Measurements of friction coefficients. 
1323 
10° 
