Active chimney effect using heated porous layers: optimum heat transferAbdelhak Mehiris, Djamel-Edine Ameziani, Omar Rahli, Khadija Bouhadef and Rachid BennacerEur. Phys. J. Appl. Phys., 78 3 (2017) 34807DOI: https://doi.org/10.1051/epjap/2017160398