thermal diffusivity


thermal diffusivity
a material property that describes the rate at which heat diffuses through a body. It is a function of the body's thermal conductivity and its specific heat. A high thermal conductivity will increase the body's thermal diffusivity, as heat will be able to conduct across the body quickly. Conversely, a high specific heat will lower the body's thermal diffusivity, since heat is preferentially stored as internal energy within the body instead of being conducted through it. Its units are m2/s.

Mechanics glossary. 2013.

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  • Thermal diffusivity — In heat transfer analysis, thermal diffusivity (symbol: alpha,, but note that the symbols kappa, D, and k are all commonly used) is the ratio of thermal conductivity to volumetric heat capacity. It has SI of m²/s.:alpha = {k over { ho c pwhere: * …   Wikipedia

  • thermal diffusivity — temperatūrinis laidis statusas T sritis Standartizacija ir metrologija apibrėžtis Apibrėžtį žr. priede. priedas( ai) Grafinis formatas atitikmenys: angl. thermal diffusivity vok. Temperaturleitfähigkeitskoeffizient, m; Temperaturleitzahl, f rus.… …   Penkiakalbis aiškinamasis metrologijos terminų žodynas

  • thermal diffusivity — temperatūrinis laidis statusas T sritis fizika atitikmenys: angl. thermal diffusivity vok. Temperaturleitfähigkeitskoeffizient, m; Temperaturleitzahl, f rus. коэффициент температуропроводности, m pranc. diffusivité thermique, f …   Fizikos terminų žodynas

  • thermal diffusivity — temperatūrinis laidis statusas T sritis Energetika apibrėžtis Dydis, apibūdinantis medžiagos temperatūtos kitimo spartą, vykstant nenuostoviesiems šiluminiams vyksmams. Matavimo vienetas: m²/s (kvadratinis metras sekundei). atitikmenys: angl.… …   Aiškinamasis šiluminės ir branduolinės technikos terminų žodynas

  • thermal diffusivity — noun : diffusivity 2 …   Useful english dictionary

  • thermal diffusivity — Смотри коэффициент температуропроводности …   Энциклопедический словарь по металлургии

  • thermal diffusivity — Смотри Температуропроводность …   Энциклопедический словарь по металлургии

  • diffusivity — thermal diffusivity …   Mechanics glossary

  • Thermal conductivity — In physics, thermal conductivity, k, is the property of a material that indicates its ability to conduct heat. It appears primarily in Fourier s Law for heat conduction.First, we define heat conduction by the formula::: H=frac{Delta Q}{Delta t}=k …   Wikipedia

  • Thermal effusivity — In Thermodynamics, the thermal effusivity of a material is defined as the square root of the product of the material s thermal conductivity and its volumetric heat capacity. [http://www.evitherm.org/default.asp?ID=277] :e = {(k ho c p)}^{1/2}Here …   Wikipedia


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