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- Double_diffusive_convection abstract "Double diffusive convection is a fluid dynamics phenomenon that describes a form of convection driven by two different density gradients, which have different rates of diffusion.Convection in fluids is driven by density variations within them. These density variations may be caused by gradients in the composition of the fluid, or by differences in temperature (through thermal expansion). Thermal and compositional gradients can often diffuse with time, reducing their ability to drive the convection, and requiring that gradients in other regions of the flow exist in order for convection to continue. A common example of double diffusive convection is in oceanography, where heat and salt concentrations exist with different gradients and diffuse at differing rates. An effect that affects both of these variables is the input of cold freshwater from an iceberg.Double diffusive convection is important in understanding the evolution of a number of systems that have multiple causes for density variations. These include convection in the Earth's oceans (as mentioned above), in magma chambers, and in the sun (where heat and helium diffuse at differing rates).Two quite different types of fluid motion exist—and therefore are classified accordingly—depending on whether the stable stratification is provided by the density-affecting component with the lowest or the highest molecular diffusivity. If the stratification is provided by the component with the lower molecular diffusivity (for example in case of a stable salt-stratified ocean perturbed by a thermal gradient due to an iceberg), the stratification is called to be of \"diffusive\"type (see external link below), otherwise it is of \"finger\" type, occurring frequently in oceanographic studies as salt-fingers. These long fingers of rising and sinking water occur when hot saline water lies over cold fresh water of a higher density. A perturbation to the surface of hot salty water results in an element of hot salty water surrounded by cold fresh water. This element loses its heat more rapidly than its salinity because the diffusion of heat is faster than of salt; this is analogous to the way in which just unstirred coffee goes cold before the sugar has diffused to the top. Because the water becomes cooler but remains salty, it becomes denser than the fluid layer beneath it. This makes the perturbation grow and causes the downward extension of a salt finger. As this finger grows, additional thermal diffusion accelerates this effect.".
- Double_diffusive_convection thumbnail Salt_fingers.png?width=300.
- Double_diffusive_convection wikiPageExternalLink annurev.fl.26.010194.001351.
- Double_diffusive_convection wikiPageExternalLink doublediff.
- Double_diffusive_convection wikiPageExternalLink Ruddick_Gargett_intro.pdf.
- Double_diffusive_convection wikiPageExternalLink saltfing.htm.
- Double_diffusive_convection wikiPageID "22786313".
- Double_diffusive_convection wikiPageLength "10644".
- Double_diffusive_convection wikiPageOutDegree "22".
- Double_diffusive_convection wikiPageRevisionID "703317398".
- Double_diffusive_convection wikiPageWikiLink Astrophysics.
- Double_diffusive_convection wikiPageWikiLink Category:Fluid_dynamics.
- Double_diffusive_convection wikiPageWikiLink Convection.
- Double_diffusive_convection wikiPageWikiLink Diffusion.
- Double_diffusive_convection wikiPageWikiLink Fauna.
- Double_diffusive_convection wikiPageWikiLink Flora.
- Double_diffusive_convection wikiPageWikiLink Fluid_dynamics.
- Double_diffusive_convection wikiPageWikiLink Geology.
- Double_diffusive_convection wikiPageWikiLink Helium.
- Double_diffusive_convection wikiPageWikiLink Magma_chamber.
- Double_diffusive_convection wikiPageWikiLink Metallurgy.
- Double_diffusive_convection wikiPageWikiLink Oceanography.
- Double_diffusive_convection wikiPageWikiLink Prandtl_number.
- Double_diffusive_convection wikiPageWikiLink Rayleigh_number.
- Double_diffusive_convection wikiPageWikiLink Salinity.
- Double_diffusive_convection wikiPageWikiLink Salt_fingering.
- Double_diffusive_convection wikiPageWikiLink Schmidt_number.
- Double_diffusive_convection wikiPageWikiLink Thermal_expansion.
- Double_diffusive_convection wikiPageWikiLink File:Salt_fingers.png.
- Double_diffusive_convection wikiPageWikiLinkText "Double diffusive convection".
- Double_diffusive_convection wikiPageWikiLinkText "double diffusive convection".
- Double_diffusive_convection wikiPageUsesTemplate Template:Cite_journal.
- Double_diffusive_convection wikiPageUsesTemplate Template:Math.
- Double_diffusive_convection subject Category:Fluid_dynamics.
- Double_diffusive_convection hypernym Phenomenon.
- Double_diffusive_convection type Disease.
- Double_diffusive_convection type Dynamic.
- Double_diffusive_convection type Mechanic.
- Double_diffusive_convection comment "Double diffusive convection is a fluid dynamics phenomenon that describes a form of convection driven by two different density gradients, which have different rates of diffusion.Convection in fluids is driven by density variations within them. These density variations may be caused by gradients in the composition of the fluid, or by differences in temperature (through thermal expansion).".
- Double_diffusive_convection label "Double diffusive convection".
- Double_diffusive_convection sameAs Q5300012.
- Double_diffusive_convection sameAs Convecção_difusiva_dupla.
- Double_diffusive_convection sameAs m.05zp13h.
- Double_diffusive_convection sameAs Q5300012.
- Double_diffusive_convection wasDerivedFrom Double_diffusive_convection?oldid=703317398.
- Double_diffusive_convection depiction Salt_fingers.png.
- Double_diffusive_convection isPrimaryTopicOf Double_diffusive_convection.