Thermal analysis of orthotropic annular fins with contact resistance: A closed-form analytical solution

► We present closed-form temperature solutions for polymeric composite two-dimensional annular fins subject to convective-tip boundary condition and the contact resistance at the fin base. ► The generalized results are presented in terms of one geometric parameter and three dimensionless fin parameters. ► Several special cases including the insulated tip boundary condition are recovered from the generalized benchmark solutions. ► Dimensionless heat transfer rates are also presented for the annular fins that can help to solve design and optimization problems of many natural and forced convection polymeric composite fins.