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Effective thermal conductivity of composite pipe

Effective thermal conductivity of composite pipe

Effective thermal conductivity of composite pipe

(OP)
I am using a specialized well bore anlysis program that calculates thermal profiles in down hole.  The program requires a "k" thermal conductivity value for drill pipe as an input.

I am using a pipe that has insulation at different locations along its length.  I would like to know how to calculate the effective "k" (thermal conductivity) of one pipe section "L".  The pipe is basically steel with an insulation layer.  

RE: Effective thermal conductivity of composite pipe

Calculate it on the basis of the equivalent thermal resistance, so K = L/(x1/k1 + x2/k2. The problem is tht any boundary condition such k. dt/dx = h. (T-Ta) will be wrong using an equivalent K.

Tata  

RE: Effective thermal conductivity of composite pipe

Your question is too vague to get a proper answer.

Do you mean that the insulation around the steel pipe is different or non-existent at various positions and, if so, what are they? It is very problematical to develop a socalled equivalent K . Mpre realistically you might need a piecewise solution using a different program for this.

I would strongly suggest that you explain exactly what you are trying to do and give us a sense of thermal boundaries and flow conditions, if any.

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