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New answers tagged thermal-conductivity

1

Because of the high degree of symmetry, this is actually a relatively simple problem. Use the 3 dimensional heat propagation equation and transform to spherical coordinates. At the boundary steel-air, calculate the overall heat loss as: $\frac{dQ}{dt}=-hA(u_R(t)-u_0)$ where $h$ is the heat transfer coefficient (estimates of which you'll find for simple ...

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There's a big difference between a piece of glass and a window structure that is made of glass. For the structure, the thermal U-factor is the sum of the U-factors of the glass itself, plus other structural parameters, such as air infiltration which is very specific to the type of window you are considering. Suggest that you look at window manufacturers' ...

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I am not quite sure what kind of examples you have in mind, the standard kinetic theory estimate of the thermal conductivity is $$\kappa = \frac{1}{3} n\bar{v} c_V l_{mfp}$$ where $n$ is the density, $\bar{v}\sim T/m$ is the mean velocity of the molecules, $l_{mfp}$ is the mean free path, and $c_V$ is the specific heat. This says that keeping the mean free ...

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