Abstract: In this paper, A method, consisted of perturbation method, Garlerkin method andfinite-difference method, is designed to calculate fully developed flows in curved tubes ofrectangular cross-section. It costs less computation than that of direct solving N-Sequations, and prevents from building high-order difference equations and extra dealingwith the boundary conditions. Numerical results in the situation of small curvature and lowDean number is in accordance with former’s numerical and experimental results in quality,and it shows the feasibility of this paper’s method.

Key words: curved tube, Galerkin method, Dean number