The limits of isothermal model validity in the case of natural convection cooling of heating blocks in a horizontal channelD. Mouhtadi, A. Amahmid, M. Hasnaoui, E.-H. Kadri and R. BennacerMATEC Web of Conferences, 1 (2012) 06004DOI: https://doi.org/10.1051/matecconf/20120106004