In this paper, the convective-radiative fins of rectangular profile with
temperature-dependent thermal conductivity are considered. By studying the
conventional heat transfer equation, its modified fractal form, which can
describe the problem in the porous medium, is presented based on He?s
fractal derivative for the first time. The fractal two-scale transform
method together with the Taylor series are applied to deal with fractal
model, and an analytical approximate solution is obtained. The impact of the
different fractal orders on the thermal behavior of the fins is also
elaborated in detail. In addition, a comparison between our solution and the
existing one is given to prove the correctness of the proposed method, which
shows that the proposed method is easy but effective, and are expected to
shed a bright light on practical applications of fractal calculus.