-------- Rolling Spheres on a Smooth Incline
Spherical steel beads are flowing through a 2D channel
that is bounded by rough sidewalls. Inclination
angle q = 1 ~ 4 degrees; d = diameter
of the spheres = 0.3175cm.
of Typical Flows :
Oscillatory Two-phase Flow (2PF):[(5.1Mb)]
in experiment; channel width = 6d.
[3X fast forward (~6.7sec, 1.3Mb)],
[6X fast forward(~6.7 sec,0.7Mb)],
Uniform Dense Flow (UDF):[(5.1Mb)]
~8.7sec. in experiment; channel width = 12d.
fast forward(~6.7sec, 1.3Mb)], [Reverse
Local close-up views of UDF
(Channel width = 12d)
(1) near the rough boundary
(shear band):[ (2.6Mb)
* Beads seen at the bottom edge of the images belong
to the layer closest to a bumpy wall.
-- out-of-focus images, total length =(4/1000)sec/fr.*260fr.
(2) along the centerline of the channel
(plug region):[ (2.6Mb)
-- same image
conditions as in (1)
(3) with ultra-high resolution:[
-- 3000 frames/sec.
, 1250 frames in total ; particle-wise spatial resolution
Accelerating Gaseous Flow (AGF):[(5.1Mb)]
~2.2sec. in experiment; channel width = 16d
* In the movies above, the left edge of the image coincides
the inlet of the channel.
* See another region starting at ~25d away from
the channel inlet [( 5.1Mb )]
Flow around an Obstacle [(1.3Mb)]
~4.6sec. in experiment; obstacle diameter = 3.5d
plus [3X fast forward (386kb)],
[2X fast forward(~3.0sec
-- email: JC