Logo  
Arrow Home
Arrow Site Map
Arrow Search
Arrow New User
Arrow Contact Us
Arrow Gallery

  BACK to Gallery of Flow Images   Submit Image    

 
  vortex instabilities

vortex instabilities

  The top picture was obtained using a holography technique [Meng & Hussain, Appl. Opt. 34, 1827 (1995)] and display a nonlinear breakdown of a drop into water. The drop, aqueous polystyrene suspension with 90% water and 0.5cm in diameter, falls freely from a distance of 1cm above the water surface. The drop undergoes vortex ring instability that cascade on smaller and smaller scales (droplets, wakelets, ringlets) and yield flow crowns, 3D arcades and chaotic structures. The bottom picture was taken by J. J. Thompson and H. J. Newal in 1885, showing similar instabilities demonstrated by dye entering water.

References:

Estevadeordal, J., Meng, H., Gogineni, S., Goss, L., and Roquemore, M., "3D Visualization of Vortex-Ring and Bag-Shaped Instabilities Using Holography", Phys. of Fluids (Gallery of Fluid Motion), 9, No.9, S5, 1997.

Meng, H., Estevadeordal, J., Gogineni, S., Goss, L., and Roquemore, M, "Holographic Flow Visualization, a Tool for Studying Three Dimensional Coherent Structures and Instabilities", J. of Visualization, Vol. 1, 2, 133-144, 1998.

Contributor: Dr. Jordi Estevadeordal of ISSI.

 

The copyright on these images is held by the contributors. Permission must be sought before using them in any way.