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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

Attributes	Values
rdfs:label	Sekundärströmung (de) Secondary flow (en)
rdfs:comment	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. (de) 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 (en)
foaf:depiction
dcterms:subject	Meteorological phenomena Tropical cyclone meteorology Fluid dynamics
Wikipage page ID	14983028 (xsd:integer)
Wikipage revision ID	1117745543 (xsd:integer)
Link from a Wikipage to another Wikipage	Potential flow Pratt & Whitney PW2000 North American XB-70 Bernoulli's principle Anticyclone Cut bank Viscosity Vortex Dust devil Viscosity Isobar (meteorology) Meteorological phenomena Concorde Continuity equation Engineering Geostrophic wind Boundary layer Oxbow lake Streamlines, streaklines, and pathlines Tropical cyclone Tropical cyclone meteorology Centripetal force Tornado Coriolis effect Helicoidal flow Latent heat Linearization Gradient wind Drag (physics) Fluid dynamics Balanced flow Geostrophic current Relative humidity Fluid dynamics Divergence Newton's second law Meander Roughness length Turbomachinery Point bar Compressors Tea leaf paradox Turbines Eyewall Lockheed SR-71
Link from a Wikipage to an external page	https://web.archive.org/web/20091129121751/http:/www.softinway.com/news/articles/THERMAL-AND-CFD-ANALYSIS-OF-STEAM-TURBINE-1.asp https://www.youtube.com/watch%3Fv=Ws621bORm5o
sameAs	Secondary flow Secondary flow Secondary flow Secondary flow Secondary flow Secondary flow Secondary flow Secondary flow
dbp:wikiPageUsesTemplate	dbt:Annotated_link dbt:ISBN dbt:Main dbt:More_citations_needed dbt:Reflist dbt:Short_description
thumbnail	wiki-commons:Special:FilePath/Iraqi_Dust_Devil.jpg?width=300
has 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). (de) 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. (en)
gold:hypernym	Inviscid
prov:wasDerivedFrom	wikipedia-en:Secondary_flow?oldid=1117745543&ns=0
page length (characters) of wiki page	18807 (xsd:nonNegativeInteger)
foaf:isPrimaryTopicOf	wikipedia-en:Secondary_flow
is Link from a Wikipage to another Wikipage of	Schoharie Creek Bridge collapse Hydraulic diameter Culvert Dust devil Index of physics articles (S) Coriolis force Three-dimensional losses and correlation in turbomachinery Oxbow lake Secondary circulation Tornado Tornado preparedness Heat transfer enhancement Helicoidal flow Fluid dynamics Balanced flow Fluid mechanics Meander cutoff Baer–Babinet law Aeolian processes

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