The Flow Patterns in Deformation Process of Vortex Ring

2000 ◽  
Vol 2000.4 (0) ◽  
pp. 195-196
Author(s):  
Kouhei IZUCHI ◽  
Ikuhiro OHYA ◽  
Nobuyuki OHKURA ◽  
Hidetoshi HAYAFUJI ◽  
Muneshige OKUDE
Keyword(s):  
Vortex Ring ◽  
Deformation Process ◽  
Flow Patterns

Flow Patterns of a Circular Vortex Ring With Density Difference Under Gravity

1972 ◽  
Vol 39 (4) ◽  
pp. 869-872 ◽  
Author(s):  
C.-J. Chen ◽  
L.-M. Chang
Keyword(s):  
Vortex Ring ◽  
Flow Patterns ◽  
Density Difference ◽  
Ambient Fluid ◽  
Stability Curve ◽  
The Stability

The evolution of a circular vortex ring with a density 1.5 times of the ambient fluid under gravity was investigated. Three distinct patterns, namely, laminar, wavy, and turbulent, were observed. It is found that approximately as Nre > 2000, the vortex becomes turbulent, as Nre < 1500, laminar but to disintegrate into subrings. The stability curve was determined.

THE FORMATION AND STRUCTURE OF VORTEX RINGS

1964 ◽  
Vol 42 (4) ◽  
pp. 678-683 ◽  
Author(s):  
R. H. Magarvey ◽  
C. S. MacLatchy
Keyword(s):  
Thin Layer ◽  
Experimental Evidence ◽  
Vortex Ring ◽  
Flow Patterns ◽  
Vortex Rings ◽  
Qualitative Investigation ◽  
Ambient Fluid ◽  
Preliminary Examination ◽  
The Stability ◽  
Circular Axis

A preliminary examination was made of the formation and structure of the classical vortex ring. It is inferred from the experimental evidence that the configuration is not a true ring, but a layer of disperse fluid rolled about a circular axis. The stability of this pseudo-ring was found to be a result of the stability of its two rolled layers. The evidence suggests that a thin layer of fluid demarcated by two surfaces of discontinuity of opposite vorticity is relatively stable. A qualitative investigation was made of the flow patterns within the structure, but no attempt was made to relate velocities to ring geometry or to the physical characteristics of the ambient fluid.

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