scholarly journals Static and dynamic features of granular material failure due to upward pulling of a buried sphere by a slowly increasing force

Soft Matter ◽  
2021 ◽  
Author(s):  
Payman Jalali ◽  
Yuchen Zhao ◽  
Joshua E. S. Socolar
Keyword(s):  
Granular Material ◽  
High Speed ◽  
Material Failure ◽  
Dynamic Features ◽  
Video Imaging ◽  
High Speed Video ◽  
Pulling Force ◽  
Granular Column

A spherical intruder embedded in a confined granular column is extracted by pulling it upward by an attached string. At a certain pulling force (measured), the failure of granular column occurs characterized by high-speed video imaging.

scholarly journals Physics of Electrostatic Projection Revealed by High-Speed Video Imaging

2020 ◽  
Vol 13 (3) ◽  
Author(s):  
Arash Sayyah ◽  
Mohammad Mirzadeh ◽  
Yi Jiang ◽  
Warren V. Gleason ◽  
William C. Rice ◽  
...  
Keyword(s):  
High Speed ◽  
Video Imaging ◽  
High Speed Video

Using High Speed Video Imaging in the Study of Cracking Processes in Rock

2009 ◽  
Vol 32 (2) ◽  
pp. 101631 ◽  
Author(s):  
L. D. Suits ◽  
T. C. Sheahan ◽  
L. N. Y. Wong ◽  
H. H. Einstein
Keyword(s):  
High Speed ◽  
Video Imaging ◽  
High Speed Video

Direct Observation of pH-Induced Coalescence of Latex-Stabilized Bubbles Using High-Speed Video Imaging

Langmuir ◽  
2010 ◽  
Vol 26 (11) ◽  
pp. 7865-7874 ◽  
Author(s):  
Seher Ata ◽  
Elizabeth S. Davis ◽  
Damien Dupin ◽  
Steven P. Armes ◽  
Erica J. Wanless
Keyword(s):  
Direct Observation ◽  
High Speed ◽  
Video Imaging ◽  
High Speed Video

scholarly journals Drop impact entrapment of bubble rings

2013 ◽  
Vol 724 ◽  
pp. 234-258 ◽  
Author(s):  
M.-J. Thoraval ◽  
K. Takehara ◽  
T. G. Etoh ◽  
S. T. Thoroddsen
Keyword(s):  
High Speed ◽  
Strong Influence ◽  
Drop Size ◽  
Water Drop ◽  
High Impact ◽  
Initial Contact ◽  
Streamwise Vortices ◽  
Video Imaging ◽  
High Speed Video ◽  
First Contact

AbstractWe use ultra-high-speed video imaging to look at the initial contact of a drop impacting on a liquid layer. We observe experimentally the vortex street and the bubble-ring entrapments predicted numerically, for high impact velocities, by Thoraval et al. (Phys. Rev. Lett., vol. 108, 2012, article 264506). These dynamics mainly occur within $50~\mathrm{\mu} \mathrm{s} $ after the first contact, requiring imaging at 1 million f.p.s. For a water drop impacting on a thin layer of water, the entrapment of isolated bubbles starts through azimuthal instability, which forms at low impact velocities, in the neck connecting the drop and pool. For Reynolds number $Re$ above ${\sim }12\hspace{0.167em} 000$, up to 10 partial bubble rings have been observed at the base of the ejecta, starting when the contact is ${\sim }20\hspace{0.167em} \% $ of the drop size. More regular bubble rings are observed for a pool of ethanol or methanol. The video imaging shows rotation around some of these air cylinders, which can temporarily delay their breakup into micro-bubbles. The different refractive index in the pool liquid reveals the destabilization of the vortices and the formation of streamwise vortices and intricate vortex tangles. Fine-scale axisymmetry is thereby destroyed. We show also that the shape of the drop has a strong influence on these dynamics.

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