Abstract
This paper discusses the occurrence and the mechanisms behind a previously unreported phenomenon of the "granular jump" observed in the gas-solids flow within the pneumatic conveying system. From the phenomenological point of view the phenomenon resembles the already known processes such as hydraulic jumps in shallow water or propagation of bores in gravity driven avalanches, although clearly the flow itself is driven by the aerodynamic forces related to the gas flow and the behaviour of the front of the "jump" itself, as discussed in the paper, is modified significantly by their presence. A series of high-speed camera visualisations are presented, which focus on this unusual behaviour of the flow on the border-line between cluster and stratified flow regimes in a horizontal pipe. Some similarities are drawn between the observed phenomenon and the broader class of problems exhibiting transition between super- and sub-critical flows. The fluid dynamical phenomena are discussed and the results obtained are compared quantitatively with simple theoretical models.
Original language | English |
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Title of host publication | AIChE Annual Meeting, Conference Proceedings 2006 |
Number of pages | 9 |
Publication status | Published - 2006 |
Externally published | Yes |
Event | American Institute of Chemical Engineers Spring Meeting & 5th World Congress on Particle Technology - Orlando, United States Duration: 23 Apr 2006 → 27 Apr 2006 https://www.aiche.org/conferences/aiche-spring-meeting-and-global-congress-on-process-safety/2006/proceeding/group/fifth-world-congress-on-particle-technology (Link to Conference Website) |
Conference
Conference | American Institute of Chemical Engineers Spring Meeting & 5th World Congress on Particle Technology |
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Country/Territory | United States |
City | Orlando |
Period | 23/04/06 → 27/04/06 |
Internet address |