Heat transfer analysis of nanofluid flow through backward facing step Ahlem Boudiaf, Fetta Danane, Youb Khaled Benkahla, Walid Berabou, Mahdi Benzema and Seif-Eddine Ouyahia MATEC Web Conf., 307 (2020) 01010 Published online: 10 February 2020 DOI: 10.1051/matecconf/202030701010