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A comment on change of Nusselt number sign in a channel flow filled by a fluid-saturated porous medium with constant heat flux boundary conditions

Uçar, Eren; Mobedi, Moghtada; Özerdem, Barış; Pop, Ioan (Springer, 2013-01)

The aim of this Letter is to show that, the Nusselt number sign might be changed without changing of heat transfer direction at the wall of channels, even for flows without viscous dissipation. The sign of the Nusselt ...