A fractal model for predicting the effective heat conductivity of fibrous assemblies was established.
In the model, fiber-to-fiber contact influence on solid heat conductivity was taken into consideration.
Radiative heat conductivity was also considered to get the effective heat conductivity. The effective
heat conductivity was proved to be related to the following parameters, including the pore area fractal
dimension, tortuosity fractal dimension, maximum and minimum pore diameters, solid conductivity, air
conductivity, porosity and the ratio of the number of perpendicular channels to the total number of
channels. Experiment was conducted to verify the model, and good agreement was found between the
experimental and theoretical results.