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Title
Notes
Entered
Comments

Wave Tank

wavetank_y0908d08.gif

click here to download video

mp2 (15 MB)
 
Runtime:
   19" 

'0908.09

   
 
 
 

A dilute concentration of birefringent fluid in the blue fluid of a wave tank (16" x 3" x 1"). 
 
 

(file name: WaveTank_y0908d08v2.mpg)
 

Vortex Street

vortex_street_y0907d18.jpg

click here to download photo

click here to download video

mp2 (9.5 MB)
 
Runtime:
   12"

'0908.09

A vortex street produced by pulling a 3/4" diameter cylinder across a quiescent birefringent fluid. (tank size: 24" x 8" x 1") 
 
(file name: VortexStreet_y0907d18)
 

Gallery of Fluid Motion 2008 entry

lsc_gfm_2008.jpg
Jet bursting into a quiescent chamber

click here to download photo

click here to download video

mp2
     (131 MB)
 
Runtime:
   2' 50"

'0908.20

This was my entry for the Gallery of Fluid Motion at the American Physical Society's Division of Fluid Mechanics (APS DFD) annual conference, San Antonio, Texas, November, 2008.
 
(file name: lsc_gfm_2008)

   

aquachrome060605.jpg

 
wmv (1.5MB)

 
'0606.05

 
Handheld demo.  Neat, spontaneous colors.  20" runtime. 

"Early Results"
WMV (13MB)
'0510.02

 
 
1st video; 3' runtime
 

 

p1190019.jpg

"Free Jet"

WMV (4.5MB)

'0601.20

Nice, colorful flow circulating through the viewing area.
 
Think of a self-contained fountain -- but with great colors, ones that magically appear and disappear.  
 
Runtime: 20"  

 

Photos

Title
Notes
Entered
Comments

p9020003.jpg

"Cylinder"

325 KB, JPG
'0510.02

 
Quasi-Karman Vortex Street. 
 
This was a first attempt at producing a vortex street.  Two vortices appear to be shedding off the top of the cylinder and two off the bottom.  It has been suggested that better vortex development could be had with a wider channel (here ~ 4x the cylinder diameter).  Efforts at improving the upstream laminar flow and flow rate are also in process. 

pb090005.jpg

Angle of Attack: 0°

329 KB, JPG

'0511.21

 
Hydrofoil at 0 Angle of Attack. 
 
The upstream flow is far from laminar.  Much effort has been put into improving this and more needs to be done.  Nonetheless, this photo should give one an idea of the flow around this object. 
 
As one might expect, with this 0 angle of attack, the flow is virtually undisturbed and fully attached to the surface of the hydrofoil. 

pb090006.jpg

Angle of Attack: 10°

331 KB, JPG

'0511.28

Flow separation indicated at ~1/3 cord. 

pb090007.jpg

Angle of Attack: 40°

335 KB, JPG

'0511.28

More flow separation. 

pb090008.jpg

Angle of Attack: 60°

327 KB, JPG

'0511.28

Flow separation fully developed. 
 
Note colors coming off the leading and trailing edges.  The absence of colors in that region between the leading and trailing edges indicates very little flow in that area.  Since the flow rate is very slow here (~1 cm/sec), the turbulence one might expect in this area is not occurring. 
















 
 
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Last updated:
 
'0908.08
Changes: Added the "Wave Tank" video 
 
'0902.13
Changes: Added the "Vortex Trail" video
 
'0601.21                  
Changes: Minor mods; removed the 130 MB "Early Results" MPG video.