Numerical study of MHD natural heat transfer of non-Newtonian, carbon nanotube-water nanofluid inside an internally finned annulusHooman Hadidi, Seyed Mahmood Mousavi and Mehdi GhalambazEur. Phys. J. Plus, 136 9 (2021) 960DOI: https://doi.org/10.1140/epjp/s13360-021-01923-w