Two reliable methods for solving the forced convection in a porous-saturated duct M. S. Hashemi, M. Inc, N. Seyfi and M. Bayram Eur. Phys. J. Plus, 135 1 (2020) 29 Published online: 09 January 2020 DOI: 10.1140/epjp/s13360-019-00007-0