a: 



LJ 

 CD 



< 



X 

 D 

 O 



\- 



V) 



.28n 

 .27- 

 .26- 

 .25- 

 .24- 

 .23- 

 .22- 

 .21- 

 .20- 

 .19- 

 .18- 

 .17- 

 .16. 



SUPERCRITICAL 

 (Reg = 800 TO 1000)' 







* 



O A A 



SUBCRITICAL 



CRITICAL 

 (Re, = 200 TO 250) 



50 100 150 200 250 300 



ROUGHNESS REYNOLDS NUMBER, Reg 



350 



Figure 2.22 Strouhal number Si — f^Dl I' plotted against tlie rougliness Reynolds number 

 Rej = V^lv. Here 8 is the cylinder surface roughness. Legend for data points: 



Peltzer and Rooney (31): 



Rough (8/D = 10"^) 



A Rough, low turbulence = .03"/o 



Buresti and Lanciotli (32): 



•Rough (8/D = 10-3) 



• Rough (8/D = 3.5 xlO^^) 



Alemdaroglu, Rebillat and Goethals (33): 



1 Rough (8/D = 10-5) 



O Rough (6/D = 5 X IQ-^) 

 ® Rough (8/D = 3.4 x IQ-^) 



400 



47 



