| Autor: |
I.D. Doig, R.H. Buchanan, R.J. Ring |
| Rok vydání: |
1973 |
| Předmět: |
|
| Zdroj: |
Powder Technology. 8:117-125 |
| ISSN: |
0032-5910 |
| DOI: |
10.1016/0032-5910(73)80074-9 |
| Popis: |
Efflux rates of solids submerged in water are reported for a novel hopper geometry incorporating an inner concentric cylinder within an otherwise conventional hopper with a cone base and central orifice. Solids are contained in the annular region between the outer and inner cylinders. Solid efflux rates depend on either the distance the inner cylinder (which forms a gate for solids contained in the annulus) is raised or (beyond a particular gate aperture) the base orifice size. The arrangement allows co-current solids—water flow, and the solids efflux rate W is given by W =AeffϱB(gdp) 1 2 (frcase|ϱP-ϱw/ϱP) 1 2 X 2.32(sin φ - μs cos φ)0.94 where the gate aperture area Aeff determines the efflux rate. It is argued that the inverse dependence on the square root of the particle diameter, dp, results from a tendency towards stick—slip flow in the converging region immediately above the “gate”. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
|
