convert from heat transfer coefficient to thermal conductivity
convert from heat transfer coefficient to thermal conductivity
(OP)
How do I convert from heat transfer coefficient of a material to its thermal conductivity?
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convert from heat transfer coefficient to thermal conductivity
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RE: convert from heat transfer coefficient to thermal conductivity
Good luck,
Latexman
RE: convert from heat transfer coefficient to thermal conductivity
where k is the thermal conductivity and Δx the thickness of the layer.
The th. conductivity is given, for example, in W/(m.K) which when divided by the thickness, in m, gives W/(m2.K), the units of the coefficient of heat transfer.
Following Fourier's law, the heat flow, expressed in W, through the layer of thickness Δx would be:
where A is the unit surface; ΔT, is the temperature gradient T2-T1.
This is for the case when the thermal conductivity is considered constant. If the thermal conductivity varies linearly with temperature as, for example, k = ko(1+βT), the equation for heat flow becomes:
RE: convert from heat transfer coefficient to thermal conductivity
for gap contact coefficient
k of air
delta = average surface rougness