Prom [5] it is seen that, even for small accelerations, the pressure may 

 reach low values as x increases. An example of cavitation resulting in such 

 a flow is shown in Figure 6, which was taken from Reference 11 , although here 

 there are additional terms due to the displacement flow about the rod. In the 

 experiments of Figure 6 an aluminum rod' was moved upward in corn syrup. The 

 same type of phenomenon may be produced by magnetostriction oscillations of a 



bar. 12 



Another type of cavitation is that produced by the entry of a mis- 

 sile from air into water. Although such cavities exhibit the properties of 

 "steady-state" cavities during parts of the life cycle, the dynamics of the 

 motion is somewhat different and will be described below. Such a cavity 

 formed behind an aluminum sphere dropped through an air-water interface i*s 

 shown in Figure 7. A final example of a steady-state cavity, which might be 

 considered as associated with water-to-air entry, is shown in Figure 8. This 

 figure shows a towed float in the shape of a blunt, symmetrical airfoil of 



Figure 6 - Cavitation Produced in a Highly Viscous Syrup 

 by a Receding Piston— After Harvey et al, Reference 11 



