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Laminar and turbulent transition of fine-grained slurries
The paper deals with experimental investigation of flow behaviour of fine-grained highly concentrated slurries (water mixtures of kaolin and ash-gypsum). Transition from laminar to turbulent regime results in an abrupt increase of the flow resistance and the flow patterns becomes fundamentally different for the two regimes. The optimum operational condition is slightly above the laminar/turbulent transition point, where flow conditions should be often very attractive from an economic point of view. The change from laminar to turbulent regime results in an abrupt increase in the hydraulic gradient. The optimal operational conditions depend mainly on flow regime, i.e. on slurry concentration and operational velocity value. Operational point slightly above the laminar/turbulent transition point VTR would be advisable since this region is often the most attractive from power consumption point of view. Near the laminar/turbulent transition point the hydraulic gradient could reach values even less than of clear water. A high level of instability and occurrence of pressure fluctuations is characteristic for the laminar/turbulent transition zone. The intersection method is very practical to determine laminar/turbulent transition if proper turbulent model is used.
Laminar and turbulent transition of fine-grained slurries
The paper deals with experimental investigation of flow behaviour of fine-grained highly concentrated slurries (water mixtures of kaolin and ash-gypsum). Transition from laminar to turbulent regime results in an abrupt increase of the flow resistance and the flow patterns becomes fundamentally different for the two regimes. The optimum operational condition is slightly above the laminar/turbulent transition point, where flow conditions should be often very attractive from an economic point of view. The change from laminar to turbulent regime results in an abrupt increase in the hydraulic gradient. The optimal operational conditions depend mainly on flow regime, i.e. on slurry concentration and operational velocity value. Operational point slightly above the laminar/turbulent transition point VTR would be advisable since this region is often the most attractive from power consumption point of view. Near the laminar/turbulent transition point the hydraulic gradient could reach values even less than of clear water. A high level of instability and occurrence of pressure fluctuations is characteristic for the laminar/turbulent transition zone. The intersection method is very practical to determine laminar/turbulent transition if proper turbulent model is used.
Laminar and turbulent transition of fine-grained slurries
Übergang laminar/turbulent von Feinkorn-Schlämmen
Vlasak, P. (Autor:in) / Chara, Z. (Autor:in)
2003
6 Seiten, 3 Bilder, 2 Tabellen, 11 Quellen
Aufsatz (Konferenz)
Englisch
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