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Statements

Subject Item
dbr:Secondary_flow
rdfs:label
Sekundärströmung Secondary flow
rdfs:comment
In fluid dynamics, flow can be decomposed into primary plus secondary flow, a relatively weaker flow pattern superimposed on the stronger primary flow pattern. The primary flow is often chosen to be an exact solution to simplified or approximated (for instance, inviscid) governing equations, such as potential flow around a wing or geostrophic current or wind on the rotating Earth. In that case, the secondary flow usefully spotlights the effects of complicated real-world terms neglected in those approximated equations. For instance, the consequences of viscosity are spotlighted by secondary flow in the viscous boundary layer, resolving the tea leaf paradox. As another example, if the primary flow is taken to be a balanced flow approximation with net force equated to zero, then the secondary Eine Sekundärströmung oder Querströmung ist in der Strömungslehre, also der Bewegung von Fluiden, eine zusätzliche Strömung in der Ebene quer zur Hauptströmungsrichtung mit vergleichsweise geringer Geschwindigkeit. Zusammen mit der Hauptströmung führen Sekundärströmungen zu spiraligen oder noch komplexeren Bahnlinien und machen strömungstechnische Vorhersagen und Berechnungen schwierig.
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dbc:Tropical_cyclone_meteorology dbc:Fluid_dynamics dbc:Meteorological_phenomena
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dbo:abstract
Eine Sekundärströmung oder Querströmung ist in der Strömungslehre, also der Bewegung von Fluiden, eine zusätzliche Strömung in der Ebene quer zur Hauptströmungsrichtung mit vergleichsweise geringer Geschwindigkeit. Zusammen mit der Hauptströmung führen Sekundärströmungen zu spiraligen oder noch komplexeren Bahnlinien und machen strömungstechnische Vorhersagen und Berechnungen schwierig. Ausgelöst werden Sekundärströmungen oft durch Ungleichmäßigkeiten wie Hindernisse, Reibung oder die Veränderung eines Querschnitts. Da sie zusätzliche Geschwindigkeiten bewirken, wird für Sekundärströmungen oft auch zusätzliche Energie benötigt, und es können zusätzliche Kräfte auftreten. Deshalb sind Sekundärströmungen in der Technik meist unerwünscht; in Sonderfällen können sie aber auch bewusst herbeigeführt werden, um wünschenswerte Effekte herbeizuführen (beispielsweise Vermischung und Ausgleich oder Stabilisierung). In fluid dynamics, flow can be decomposed into primary plus secondary flow, a relatively weaker flow pattern superimposed on the stronger primary flow pattern. The primary flow is often chosen to be an exact solution to simplified or approximated (for instance, inviscid) governing equations, such as potential flow around a wing or geostrophic current or wind on the rotating Earth. In that case, the secondary flow usefully spotlights the effects of complicated real-world terms neglected in those approximated equations. For instance, the consequences of viscosity are spotlighted by secondary flow in the viscous boundary layer, resolving the tea leaf paradox. As another example, if the primary flow is taken to be a balanced flow approximation with net force equated to zero, then the secondary circulation helps spotlight acceleration due to the mild imbalance of forces. A smallness assumption about secondary flow also facilitates linearization. In engineering secondary flow also identifies an additional flow path.
gold:hypernym
dbr:Inviscid
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