Effect of the magnetic field direction on forced convection heat transfer enhancements in ferrofluidsWahid Cherief, Yvan Avenas, Sébastien Ferrouillat, Afef Kedous-Lebouc, Laurent Jossic, Jean Berard and Mickael PetitEur. Phys. J. Appl. Phys., 71 1 (2015) 10901DOI: https://doi.org/10.1051/epjap/2015150059