| 1. |
- Andreasson, Patrik, et al.
(författare)
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River flow with excessive suspended sediment load : an evaluation of turbulent flow characteristics
- 1986
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Ingår i: Nordic Hydrology. - : IWA Publishing. - 0029-1277 .- 1996-9694. ; 17:4-5, s. 383-390
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Tidskriftsartikel (refereegranskat)abstract
- River flows with high volume concentrations (20-50%) of silty sediments generally imply that the mixture has non-Newtonian properties. In this study, the rheological behavior of mixtures with solids particles smaller than 0. 1 mm was identified experimentally with viscosimeters. Characteristic flow parameters, such as energy losses and depths, were then determined in several examples for turbulent open channel flows.
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| 2. |
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| 3. |
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| 4. |
- Sellgren, Anders
(författare)
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Airflow cooling in storm water systems
- 1984
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Ingår i: Proceedings of the Third International Conference on Urban Storm Drainage : Göteborg, Sweden, June 4 - 8, 1984. - Göteborg : Chalmers tekniska högskola. - 9170321280 ; , s. 117-126
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Konferensbidrag (refereegranskat)abstract
- Observations have shown that large quantities of ground heat are lost when air flows through storm water systems during cold spells in winter. The temperature distribution in the ground around a storm water pipeline under a street was examined. The non-linear problem of heat conduction with phase change in moist soil was mathematically modelled and the model was used to simulate ground temperature changes caused by the flow of cold air in a buried pipe. Some consequences of airflow cooling are schematically discussed
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| 5. |
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| 6. |
- Sellgren, Anders, et al.
(författare)
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Choice of solids concentration in mine tailings pipelines
- 1986
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Ingår i: Slurry technology - the second decade. - Washington : Slurry technology association. ; , s. 243-249
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Konferensbidrag (refereegranskat)abstract
- The majority of slurry transport applications are short-distance in-plant installations, mainly in the minerals industry. For example with most ores, after the concentration process, a fine-grained tailings slurry is transported by pipeline, sometimes as far as several kilometers, to disposal areas. Great savings of energy and water can be obtained at concentrators if the tailings slurry is thickened more effectively and water is reused directly instead of being transported the long way around the disposal area. A recent study, Sellgren (1983), shows that large amounts of heating energy can be recovered using a heat pump arrangement. The potential savings in Swedish mines was estimated to be about 10 to 20 GWh per year at every concentrator, the greatest part of which will be savings in oil.
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| 7. |
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| 8. |
- Sellgren, Anders
(författare)
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Effects of chemical additives on sedimentation during slurry transport
- 1986
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Ingår i: Flocculation, sedimentation and consolidation. - : American Institute of Chemical Engineers. - 0816903573 ; , s. 415-425
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Konferensbidrag (refereegranskat)abstract
- Effects of chemical additives and a freeze-thaw cycle on the flow of mainly fine-grained industrial slurries are demonstrated based on experimental results and reported pilot-scale tests. The hydrodynamic behaviour of coarse particle transport at very high concentrations is schematically demonstrated by experimental data and it was concluded that the flow cannot generally be represented by a simple rheological model.
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| 9. |
- Sellgren, Anders, et al.
(författare)
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Effects of highly concentrated slurries on the performance of centrifugal pumps
- 1986
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Ingår i: International Symposium on Slurry Flows : Pres. at the Winter Annual Meeting of the American Society of Mechanical Engineers. - New York : American Society of Mechanical Engineers. ; , s. 143-148
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Konferensbidrag (refereegranskat)abstract
- Clear-water head and efficiency are generally lowered by the presence of solids, the concentration having a predominant influence on efficiency. Experimental results with two mine tailings products pumped at concentrations by weight of up to 60% indicated that the drop in head was limited to about 15% and the reduction in efficiency exceeded the reduction in head if the concentration by weight exceeded 40%. A similar pattern was found with another pump and a coarser mineral, however, the reductional effects were larger. With high concentrations of the finest tailings product (maximum particle size equals 0. 1 mm), the drop in efficiency was reasonably well correlated to the pump Reynolds number and the specific speed. Although the reductional effects are less pronounced in large pumps, the exact scaling criteria are not known at present.
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| 10. |
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