翻訳と辞書 Words near each other ・ Thermal copier ・ Thermal copper pillar bump ・ Thermal Credits ・ Thermal cutoff ・ Thermal cycler ・ Thermal de Broglie wavelength ・ Thermal death time ・ Thermal decomposition ・ Thermal degradation of polymers ・ Thermal depolymerization ・ Thermal design power ・ Thermal desorption ・ Thermal desorption spectroscopy ・ Thermal destratification ・ Thermal diffusion ・ Thermal diffusivity ・ Thermal diode ・ Thermal dissolution ・ Thermal dose unit ・ Thermal effective mass ・ Thermal efficiency ・ Thermal effusivity ・ Thermal ellipsoid ・ Thermal Emission Imaging System ・ Thermal Emission Spectrometer ・ Thermal emittance ・ Thermal energy ・ Thermal energy storage ・ Thermal engineering ・ Thermal entrance length Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Thermal diffusivity ： ウィキペディア英語版 Thermal diffusivity In heat transfer analysis, thermal diffusivity is the thermal conductivity divided by density and specific heat capacity at constant pressure. It measures the ability of a material to conduct thermal energy relative to its ability to store thermal energy. It has the SI unit of m²/s. Thermal diffusivity is usually denoted ''α'' but ''a'', ''κ'', ''K'', and ''D'' are also used. The formula is: :$\backslash alpha\; =\; =\; \backslash alpha\; \backslash nabla^2\; T$, thermal diffusivity is the ratio of the time derivative of temperature to its curvature, quantifying the rate at which temperature concavity is "smoothed out". In a sense, thermal diffusivity is the measure of thermal inertia. In a substance with high thermal diffusivity, heat moves rapidly through it because the substance conducts heat quickly relative to its volumetric heat capacity or 'thermal bulk'. Thermal diffusivity is often measured with the flash method.〔(NETZSCH-Gerätebau, Germany )〕〔 〕 It involves heating a strip or cylindrical sample with a short energy pulse at one end and analyzing the temperature change (reduction in amplitude and phase shift of the pulse) a short distance away.〔 〕 ==See also== * Heat equation * Laser flash analysis * Thermodiffusion * Thermal effusivity * Thermal time constant 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Thermal diffusivity」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.