Zierep and Sawatzki 



Fig 4 For larger Reynolds number the streamlines 

 are spirals, s = 5 mm, Re = 2350 



Fig 5 For large Reynolds number the vortex axes 

 become spirals and end in the flow field, 

 s = 1.05 mm. Re = 27,000, Ta = 41.6 



278 



