Abstract
The influence of non-uniform temperature during convective transport in a closed enclosure is examined numerically. This system works using a water-based nanofluid where Cu is used as colloidal suspension of nanoparticles. The numerical simulation is performed in a Computational Fluid Dynamics software constructed using finite volume discretization technique. The investigation is executed in a bottom wall heated (BWH) enclosure by controlling Rayleigh number (Ra) for different heating profiles. The BWH is carried using uniform, parabolic, and linear temperature profiles. For all the cases investigated, the mean temperature of the bottom wall is fixed. The transfer of energy by the convection process is calculated using the Nusselt number. Flow visualizations through streamlines and isotherms reveal that the thermal convection is minimum for uniform temperature and maximum for linear temperature profiles. The irreversibility evolved during different heating profiles is measured with entropy generation (EG). The results reveal that the EG is minimum for uniform heating and maximum for parabolic heating. Further, EG increases with an increase in Ra. The present study can provide useful insights for designing thermal devices.
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