Natural convection in tilted rectangular cavities due to bidirectional temperature gradient

Abstract

The study by the CFD for a 3D natural convection in a tilted rectangular cavity filled by silicone oil at high Prandtl number has been compared to experimental results. A constant vertical temperature gradient has been performed by subjecting the horizontal walls to temperature Th and Tc; respectively. Other walls are adiabatic except the left small sidewall is differentially heating with temperature TA creating the horizontal temperature gradient. Different values of the lateral heating and the tilt with respect to the horizontal plane are imposed. The results draw dynamic maps. The influence of two factors (TA and ) on the flow pattern and on the convective heat transfer are analysed and discussed. The simulation flow pattern results are close to those obtained experimentally for treated cases with a minimum discrepancy between the both. A spectral analysis is done to show the fluctuations seen on the natural convective flow after the stability caused by the lateral heating and tilted angle; which based on the visualization of the amplitude as a function to the frequency. The results also show a significant impact on the flow fields and the heat transfer performance is improved.

Natural Convection in Tilted Rectangular Cavity subjected to TA

“…• The fluctuations have an importance for all values of T A and θ, where their amplitude and their presence concentration vary either directly or inversely with the increase of the lateral heating for each angle (Benyoucef et al, 2017).…”

Numerical Investigation of the Electro-Thermo Convection in an Inclined Cavity Filled with a Dielectric Fluid

“…Benyoucef et al [9] have investigated the 3D convection of a tilted rectangular cavity filled with silicone oil and compared it with experimental results. A complex behavior has been detected, the increase in the angle beyond 0 • destabilizes the convective pattern to benefit from an unstable situation for specific Rayleigh number values.…”