0.3 



> 



8 0.2 



_J 



UJ 



> 



o 



UJ 



o 



z> 

 o 



UJ 



a: 



u_ 

 o 



UJ 0.1 



C/) 



cr 



UJ 



> 



—1 1 1 \ 1 i 1 1~~ 



ONSET OF CROSS FLOW OSCILLATIONS, fg = fn 



MAXIMUM CROSS FLOW 

 OSCILLATIONSv 



5x10"^ 



V AT Y=Y 



MAX 



'oo 



+ 

 -+- 



J L 



o L/D=11.5 

 + L/D=10 

 A L/D= 8 



1TRANSITI0N 

 REYNOLDS NUMBER 



10' 



10* 



5x10^ 



REYNOLDS NUMBER, Re = 



VD 



Figure 2.15 Inverse reduced velocity t^~' ^o^ maximum displacemenl amplitudes plotted against the Rey- 

 nolds number for roughened cylinders. The inverse of V^ is the Strouhal number based on /„. Maximum 

 peak displacemenl, ; onset of vortex-excited oscillations — ; from Woolton (24). 



40 



