Buoyancy Effects on Entropy Generation in the Entrance Region of Isothermal/Adiabatic Vertical Channel

Entropy generation in a rectangular channel of buoyancy opposed mixed convection

“…The physical properties of the fluid are taken to be constant except for the density in the body forces, for which the Boussinesq approximation has been adopted. The flow is assumed to be incompressible, laminar and steady, and the effect of viscous dissipation on temperature distribution is neglected while on entropy generation is considered [23]. The dimensionless form of the continuity equation, the momentum equations and the thermal energy equation in three dimensions for the incompressible flow of a constant viscosity fluid are given as:…”

“…The numerical results showed that the entropy generation rate had a minimal value near the centerline of the channel. Mokheimer [23] studied the effect of buoyancy effects on entropy generation in the entrance region of a two dimensional vertical channel. The optimum values of the buoyancy parameter (Gr/Re) at which the entropy generation assumes its minimum was obtained.…”