Exploring the Impact of a Heated Wall with a Lid on Fluid Flow and Heat Transfer Performance of an Inverted T-Shaped Enclosure

One of the major challenges in most thermal systems is efficient heat extraction of complex enclosures, including electronic cooling systems, solar collectors, and energy storage systems. This research advances the existing literature by numerically examining the mixed convection heat transfer in an inverted T-shaped enclosure computed with the Multi-Relaxation Time Lattice Boltzmann Method (MRT-LBM). The objectives are attained by considering a uniform temperature along with a constant velocity for the bottom horizontal wall of the enclosure. Whereas, except for the side walls of the lower section of the geometry, the rest of the region, including the top and the remaining walls, is insulated, which are adiabatic forms a thermally confined flow region. Moreover, the generality of the outcomes is demonstrated by considering a diverse range of parametric settings applicable to numerous situations of practical interest. The governing parameters facilitating the simulation performance evaluation include the Grashof number (۱۰۴≤Gr≤۱۰۶), Richardson number (۰.۰۱≤Ri≤۱۰۰), Prandtl number (۰.۷≤Pr≤۷), and geometric aspect ratios (L۱/L from ۰.۲-۰.۶) and (L۲/L from ۰.۲-۰.۸). The results revealed that the interaction between buoyancy and shear forces plays a vital role in the occurrence of vortices and thermal stratification within the enclosure. Both Gr and Ri are observed to increase the intensity of convective circulation along with thermal differences. Also, geometric aspect ratios are witnessed to induce substantial changes in the local heat transfer properties. The average and local Nusselt numbers showed that the uniformity of heat transfer in the geometry remains subject to the changes in L۲/L and L۱/L, however, the ratio L۲/L offers more obvious linkages in this regard. The applicability of these realizations is argued in the context of in-depth understanding of the thermal performance and flow behavior of lid-driven hybrid cavities, relevant to the thermal management of electronic systems.

کلیدواژه ها:

Heat transfer ، Streamline ، Vortices ، Reverse T-shaped ، Lattice-Boltzmann-method