The main purpose of this work is to evaluate the values of diffusion coefficients at controlvolume faces, using the finite-volume method, in transport problems that include dwusion processes. A heat conduction problem in a composite slab with linearly temperaturedependent conductivity, which has a closed-form solution, is selected for demonstrmion. It is found that the harmonic mean operation performs better than the arithmetic mean operation in evalunfr'ng the interface diffusion coeffieints. Moreover, if we intend to obtain the informotion at some specific interfaces with abrupt changes of diffusion coefficients, the recommended grid layout is arranged such that each specific interface contains a grid node. This arrangement can give more accurate predictions at these unusual inter faces.

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