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Thermal Conductivities Liquids and Gases

Thermal Conductivities of Liquids and Gases

The thermal conductivity of a given material varies with temperature, and the mean thermal conductivity is defined by

${\displaystyle k_m=\frac{1}{t_o^{\prime }-<!--\; -\; -->t_i^{\prime }}{\int <!--\; \int \; -->}_{t_o^{\prime }}^{t_i^{\prime }}kdt}$

Over moderate range, k varies linearly with t, and hence km is the value of k at the arithmetic mean of t_i' and t_o' .

Thermal conductivity is typically given in watt per metre-kelvin W/(m · K) or Btu/h · ft · °F

Source:

F. G. Keyes, Tech. Rept. 37, Project Squid (Apr. 1, 1952).

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