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In the field of fluid dynamics, a convection cell is the phenomenon that occurs when density differences exist within a body of liquid or gas. These density differences result in rising and/or falling currents, which are the key characteristics of a convection cell. When a volume of fluid is heated, it expands and becomes less dense and thus more buoyant than the surrounding fluid. The colder, denser part of the fluid descends to settle below the warmer, less-dense fluid, and this causes the warmer fluid to rise. Such movement is called convection, and the moving body of liquid is referred to as a convection cell. This particular type of convection, where a horizontal layer of fluid is heated from below, is known as Rayleigh–Bénard convection. Convection usually requires a gravitational fi

AttributesValues
rdf:type
rdfs:label
  • Konvekční buňka (cs)
  • Convection cell (en)
  • Cellule de convection (fr)
  • Sel konveksi (in)
  • Cella di convezione (it)
  • Komórka konwekcyjna (pl)
  • Célula de convecção (pt)
  • Конвективний осередок (uk)
  • 对流单体 (zh)
rdfs:comment
  • Konvekční buňka, také konvektivní buňka, je systém stoupajících a klesajících konvekčních proudů v látce plynné nebo tekuté, tvořící v ustáleném stavu uzavřenou smyčku. Tvar konvekčních buněk vznikajících v tekutině závisí na mnoha faktorech: na geometrii média (např. tvar nádoby), distribuci a účinnosti zdroje tepla, ale také na vlastnostech plynu podléhajícím konvekci (zejména Rayleighovo číslo a viskozita). (cs)
  • Une cellule de convection est une zone d'un fluide où celui-ci circule en circuit fermé. Le sens de rotation du fluide est cohérent au sein d'une même cellule, et son déplacement est de même sens de part et d'autre d'une paroi séparant deux cellules adjacentes. L'organisation en cellules de convection est l'un des modes de la convection, que l'on observe quand le déséquilibre (thermique, notamment) à l'origine des mouvements convectifs est relativement modéré (pour un fort déséquilibre on passe à différents types de régimes turbulents, sans individualisation de cellules). (fr)
  • Komórka konwekcyjna – układ wznoszących i opadających prądów konwekcyjnych w płynie, tworzących w stanie stacjonarnym zamkniętą pętlę. Kształt komórek konwekcyjnych powstających w cieczy zależy od wielu czynników: geometrii ośrodka (np. kształtu naczynia), rozkładu i wydajności źródeł ciepła, a także od właściwości płynu podlegającego konwekcji (w szczególności od jego liczby Rayleigha i lepkości). (pl)
  • Uma célula de convecção é um fenômeno de dinâmica dos fluidos que ocorre em situações onde existem diferenças de temperatura dentro de um corpo líquido ou gasoso. Estas diferenças fazem com que o líquido ou gás movimente-se devido à diferenças de densidade causada pelas diferentes temperaturas, com o fluido subindo quando adquirindo uma temperatura maior, e descendo quando sua temperatura cai. (pt)
  • Конвективний осередок (рос. конвективная ячейка, англ. convection cell; нім. Konvektionszelle f) – в , гіпотетична система руху мантійної речовини під впливом розігрівання внутрішніх частин Землі. В центральній частині системи відбувається підняття речовини, а у зовнішній – опускання. Деякі дослідники вважають, що висхідні гілки течії приурочені до серединно-океанічних хребтів, а низхідні – до острівних дуг і континентальних околиць. (uk)
  • In the field of fluid dynamics, a convection cell is the phenomenon that occurs when density differences exist within a body of liquid or gas. These density differences result in rising and/or falling currents, which are the key characteristics of a convection cell. When a volume of fluid is heated, it expands and becomes less dense and thus more buoyant than the surrounding fluid. The colder, denser part of the fluid descends to settle below the warmer, less-dense fluid, and this causes the warmer fluid to rise. Such movement is called convection, and the moving body of liquid is referred to as a convection cell. This particular type of convection, where a horizontal layer of fluid is heated from below, is known as Rayleigh–Bénard convection. Convection usually requires a gravitational fi (en)
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  • http://commons.wikimedia.org/wiki/Special:FilePath/Thunderstorm_formation.jpg
  • http://commons.wikimedia.org/wiki/Special:FilePath/Altocumulus15.jpg
  • http://commons.wikimedia.org/wiki/Special:FilePath/Rayleigh–Bénard_convection_pattern_in_honey_wine_with_cinnamon_floating_on_top_after_10_days_of_fermentation.jpg
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  • Konvekční buňka, také konvektivní buňka, je systém stoupajících a klesajících konvekčních proudů v látce plynné nebo tekuté, tvořící v ustáleném stavu uzavřenou smyčku. Tvar konvekčních buněk vznikajících v tekutině závisí na mnoha faktorech: na geometrii média (např. tvar nádoby), distribuci a účinnosti zdroje tepla, ale také na vlastnostech plynu podléhajícím konvekci (zejména Rayleighovo číslo a viskozita). (cs)
  • In the field of fluid dynamics, a convection cell is the phenomenon that occurs when density differences exist within a body of liquid or gas. These density differences result in rising and/or falling currents, which are the key characteristics of a convection cell. When a volume of fluid is heated, it expands and becomes less dense and thus more buoyant than the surrounding fluid. The colder, denser part of the fluid descends to settle below the warmer, less-dense fluid, and this causes the warmer fluid to rise. Such movement is called convection, and the moving body of liquid is referred to as a convection cell. This particular type of convection, where a horizontal layer of fluid is heated from below, is known as Rayleigh–Bénard convection. Convection usually requires a gravitational field, but in microgravity experiments, thermal convection has been observed without gravitational effects. Fluids are generalized as materials that exhibit the property of flow; however, this behavior is not unique to liquids. Fluid properties can also be observed in gases and even in particulate solids (such as sand, gravel, and larger objects during rock slides). A convection cell is most notable in the formation of clouds with its release and transportation of energy. As air moves along the ground it absorbs heat, loses density and moves up into the atmosphere. When it is forced into the atmosphere, which has a lower air pressure, it cannot contain as much fluid as at a lower altitude, so it releases its moist air, producing rain. In this process the warm air is cooled; it gains density and falls towards the earth and the cell repeats the cycle. Convection cells can form in any fluid, including the Earth's atmosphere (where they are called Hadley cells), boiling water, soup (where the cells can be identified by the particles they transport, such as grains of rice), the ocean, or the surface of the Sun. The size of convection cells is largely determined by the fluid's properties. Convection cells can even occur when the heating of a fluid is uniform. (en)
  • Une cellule de convection est une zone d'un fluide où celui-ci circule en circuit fermé. Le sens de rotation du fluide est cohérent au sein d'une même cellule, et son déplacement est de même sens de part et d'autre d'une paroi séparant deux cellules adjacentes. L'organisation en cellules de convection est l'un des modes de la convection, que l'on observe quand le déséquilibre (thermique, notamment) à l'origine des mouvements convectifs est relativement modéré (pour un fort déséquilibre on passe à différents types de régimes turbulents, sans individualisation de cellules). (fr)
  • Komórka konwekcyjna – układ wznoszących i opadających prądów konwekcyjnych w płynie, tworzących w stanie stacjonarnym zamkniętą pętlę. Kształt komórek konwekcyjnych powstających w cieczy zależy od wielu czynników: geometrii ośrodka (np. kształtu naczynia), rozkładu i wydajności źródeł ciepła, a także od właściwości płynu podlegającego konwekcji (w szczególności od jego liczby Rayleigha i lepkości). (pl)
  • Uma célula de convecção é um fenômeno de dinâmica dos fluidos que ocorre em situações onde existem diferenças de temperatura dentro de um corpo líquido ou gasoso. Estas diferenças fazem com que o líquido ou gás movimente-se devido à diferenças de densidade causada pelas diferentes temperaturas, com o fluido subindo quando adquirindo uma temperatura maior, e descendo quando sua temperatura cai. (pt)
  • Конвективний осередок (рос. конвективная ячейка, англ. convection cell; нім. Konvektionszelle f) – в , гіпотетична система руху мантійної речовини під впливом розігрівання внутрішніх частин Землі. В центральній частині системи відбувається підняття речовини, а у зовнішній – опускання. Деякі дослідники вважають, що висхідні гілки течії приурочені до серединно-океанічних хребтів, а низхідні – до острівних дуг і континентальних околиць. (uk)
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