Differential graded category: Difference between revisions

Revision as of 02:06, 4 February 2014

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.^[1]

e = {(k ρ c_{p})}^{1 / 2}

Here, k is the thermal conductivity, $ρ$ is the density and $c_{p}$ is the specific heat capacity. The product of $ρ$ and $c_{p}$ is known as the volumetric heat capacity.

A material's thermal effusivity is a measure of its ability to exchange thermal energy with its surroundings.

If two semi-infinite bodies initially at temperatures T₁ and T₂ are brought in perfect thermal contact, the temperature at the contact surface T_m will be given by their relative effusivities. ^[2]

T_{m} = T_{1} + (T_{2} - T_{1}) \frac{e_{2}}{(e_{2} + e_{1})}

This expression is valid for all times for semi-infinite bodies in perfect thermal contact. It is also a good first guess for the initial contact temperature for finite bodies.

References

↑ http://www.evitherm.org/default.asp?ID=277
↑ H. D. Baehr and K. Stephan, Wärme- und Stoffübertragung 4. Auflage, Springer, (2004), p 172, ISBN 3-540-40130-X

External links

[1] ttp://www.evitherm.org/default.asp?ID=277

[2] H. D. Baehr and K. Stephan, Wärme- und Stoffübertragung 4. Auflage, Springer, (2004), p 172, ISBN 3-540-40130-X

[1]

[2]

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+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]].<ref>http://www.evitherm.org/default.asp?ID=277</ref>
+:<math>e = {(k\rho c_p)}^{1/2}</math>
+Here, '''k''' is the thermal conductivity, '''<math>\rho</math>''' is the [[density]] and '''<math>c_p</math>''' is the [[specific heat capacity]]. The product of '''<math>\rho</math>''' and '''<math>c_p</math>''' is known as the '''volumetric heat capacity'''.
+A material's thermal effusivity is a measure of its ability to exchange [[thermal energy]] with its surroundings.
+If two semi-infinite bodies initially at temperatures '''T<sub>1</sub>''' and '''T<sub>2</sub>''' are brought in perfect thermal contact, the temperature at the contact surface '''T<sub>m</sub>''' will be given by their relative effusivities. <ref>H. D. Baehr and K. Stephan, ''Wärme- und Stoffübertragung 4. Auflage'', Springer,  (2004), p 172, ISBN 3-540-40130-X </ref>
+:<math>T_m = T_1 + (T_2-T_1){e_2 \over (e_2+e_1)}</math>
+This expression is valid for all times for semi-infinite bodies in perfect thermal contact. It is also a good first guess for the initial contact temperature for finite bodies.
+==See also ==
+* [[heat capacity]]
+* [[heat equation]]
+* [[Laser Flash Analysis|laser flash analysis]]
+* [[specific heat capacity]]
+* [[thermal conductivity]]
+* [[thermal diffusivity]]
+* [[thermal inertia]]
+==References==
+<references />
+==External links==
+* [http://www.evitherm.org/default.asp?ID=277 A reference defining various thermal properties]
+* [http://hyperphysics.phy-astr.gsu.edu/hbase/thermo/heatra.html Thermal heat transfer on HyperPhysics site]
+[[Category:Thermodynamics]]
+[[Category:Physical quantities]]
+[[Category:Heat conduction]]

Differential graded category: Difference between revisions

Revision as of 02:06, 4 February 2014

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