Thermal diffusivity: Difference between revisions
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<div class="definition"><div class="short_definition">( | <div class="definition"><div class="short_definition">(''Also called'' heat conductivity, thermometric conductivity.) The ratio of the [[thermal conductivity]] ''k'' of a substance to the product of its [[specific heat]] ''c'' and its [[density]] ρ: <div class="display-formula"><blockquote>[[File:ams2001glos-Te19.gif|link=|center|ams2001glos-Te19]]</blockquote></div></div><br/><div class="paragraph">For a gas, ''c'' is the specific heat at constant [[pressure]], ''c''<sub>''p''</sub>. The thermal diffusivity determines the rate of heating given the [[temperature]] distribution according to an equation, which for one spatial dimension is <div class="display-formula"><blockquote>[[File:ams2001glos-Te20.gif|link=|center|ams2001glos-Te20]]</blockquote></div> At a temperature of 0°C, the thermal diffusivity for air is 1.9 x 10<sup>-5</sup> m<sup>2</sup> s<sup>-1</sup>. At other temperatures, the ratio μ/''K'' is nearly constant, where μ is the [[dynamic viscosity]]. <br/>''See also'' [[diffusivity]], [[kinematic viscosity]].</div><br/> </div><div class="reference">List, R. J. 1951. Smithsonian Meteorological Tables. 6th rev. ed., . 394–395. </div><br/> | ||
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Latest revision as of 15:18, 20 February 2012
thermal diffusivity
(Also called heat conductivity, thermometric conductivity.) The ratio of the thermal conductivity k of a substance to the product of its specific heat c and its density ρ:
For a gas, c is the specific heat at constant pressure, cp. The thermal diffusivity determines the rate of heating given the temperature distribution according to an equation, which for one spatial dimension is At a temperature of 0°C, the thermal diffusivity for air is 1.9 x 10-5 m2 s-1. At other temperatures, the ratio μ/K is nearly constant, where μ is the dynamic viscosity.
See also diffusivity, kinematic viscosity.
See also diffusivity, kinematic viscosity.
List, R. J. 1951. Smithsonian Meteorological Tables. 6th rev. ed., . 394–395.
