Surface Deformation in Liquid-Solid Flows M. L. Hunt and A. Ruiz-Angulo California Institute of Technology
Ui X
-0.1 -0.15
Ui
Ui/Uel = 1.2, e = 0.54 Ui/Uel = 1.9, e = 0.68 Ui/Uel = 2.2, e = 0.70
-0.25 -0.015
-0.005
0 time [s]
0.005
0.01
COR rigid wall
0.8
60
0.7
50
indentation depth
40 30 20
0.2
10
0.1 2
3
10
10
Stokes Number
dc 0.6
100.00
0.4
-50.00
0.2
-200.00 -350.00
[mm]
227.00
0 -0.2 -0.4
-500.00 -723.93
-0.6 -0.8 0
0.5
0.3
steel-rigid wall (no deformations) steel-soft wall dry collisions(soft wall) wet collisions(soft wall)
nm
0.6
0.4
coefficient of restitution (COR) soft wall
0 1 10
0.015
0.9
70
H
-0.01
80
100
200
300
400 [mm]
12.7 mm steel particle, Ui = 0.195 m/s. Aluminum impact surface, Uel = 0.105 m/s , e = 0.68, H = 0.74 µm, Ra = 0.017 µm
500
600
700
0
Coefficient of Restitution, e
-0.05
-0.2
dp
Indentation Depth / Surface Roughness, H/Ra
0
X / dp
This research project presents experimental measurements of the approach and rebound of a particle colliding with a "deformable" surface in a viscous liquid.
1
Stokes number dependence: l lubrication effect and elastic deformation l lubrication effect and elastic-plastic deformation l negligible lubrication effect and elastic-plastic deformation Sponsored by the Petroleum Research Fund
