Numerical study of natural convection of ZnO-water nanofluid enclosed between two inclined and concentric hemispheresN. Alilat, O. Haddad and A. BaïriEur. Phys. J. Plus, 135 2 (2020) 146DOI: https://doi.org/10.1140/epjp/s13360-020-00205-1