| Issue |
Europhys. Lett.
Volume 56, Number 4, November 2001
|
|
|---|---|---|
| Page(s) | 536 - 541 | |
| Section | Electromagnetism, optics, acoustics, heat transfert, classical mechanics, and fluid dynamics | |
| DOI | https://doi.org/10.1209/epl/i2001-00554-7 | |
| Published online | 01 December 2003 | |
Intermittent granular flow in the presence of an electric field
1
Center for Condensed Matter Physics & Institute of Physics
Chinese Academy of Sciences - Beijing 100080, PRC
2
Nonlinear Physics Group, Department of Physics,
San Jose State University San Jose, CA 95192-0106, USA
Received:
9
May
2001
Accepted:
22
August
2001
In this letter experimental observations of vertical-pipe granular flow in
the presence of an electric field are reported. Granular nickel particles
flowing down a vertical pipe are found to be retarded by a local horizontal
ac electric field when the field voltage V is greater than a critical voltage
Vc. For 
, the steady-state flow rate is practically
unaffected by V. The flow rate decreases discontinuously at Vc, and then
decreases gradually for 
. Physically, particle
clusters are formed above an arch interface, which exists in the electric-field
region when . The vertical flow consists of
clusters intermittently dropping off from the interface. A transient density
wave with wavelength lengthened by electric field is also observed.
PACS: 45.70.-n – Granular systems / 97.10.Ld – Magnetic and electric fields; polarization of starlight
© EDP Sciences, 2001
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