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convert from heat transfer coefficient to thermal conductivity

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?

RE: convert from heat transfer coefficient to thermal conductivity

Heat transfer coefficient = thermal conductivity of material/thickness of heat flow path through material.

Good luck,
Latexman

RE: convert from heat transfer coefficient to thermal conductivity

The heat transfer coefficient for conduction is k/Δx
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:

Q = k*A*ΔT/Δx

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:

Q = (ko*A÷Δx)[(T2-T1) + (β/2)(T22-T12)]

RE: convert from heat transfer coefficient to thermal conductivity

h = k/delta

for gap contact coefficient

k of air

delta = average surface rougness

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