Numerical investigation of the heat transfer of a ferrofluid inside a tube in the presence of a non-uniform magnetic fieldSaman Hariri, Mojtaba Mokhtari, M. Barzegar Gerdroodbary and Keivan FallahEur. Phys. J. Plus, 132 2 (2017) 65DOI: https://doi.org/10.1140/epjp/i2017-11324-1