Speaker
Description
Natural convection within a partially porous medium constitutes a complex coupling phenomenon, where boundary conditions at the interface between porous and free zones play a key role. These mechanisms are of great interest for many industrial applications. As part of this research, we have numerically modeled the double-diffusive convection of a nanofluid (Cu-$H_{ 2}O$) circulating in a partially porous annular space. This system is delimited by two coaxial cylinders equipped with a permeable interface, reproducing realistic configurations, in which we looked into the contribution of putting three hot cells in the inner cylinder in order to control all the cavity and minimize the size of the hot source. In addition, we tried to use recent and experimental models of Corcione to better understand the heat and mass transfer processes. The external cylinder is maintained at a uniform cold temperature. However, the base walls are designed to be impermeable and adiabatic. Then, to solve the system of nonlinear and coupled conservation equations, we used a method based on the vorticity-stream function, combined with a finite-difference scheme. The numerical results represented by the streamlines, isotherms, and the heat transfer rate expressed by the Nusselt number highlight the critical influence on some control parameters like the Rayleigh number, Darcy number, the aspect ratio number, and nanoparticle concentration.
| Abstract Category | Fluid & Plasma Physics |
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