Magnetohydrodynamics Natural Convection of a Triangular Cavity Involving Ag‑MgO/Water Hybrid Nanofluid and Provided with Rotating Circular Barrier and a Quarter Circular Porous Medium at its Right‑Angled Corner

摘要

The current paper studied the behavior of a triangular cavity occupied with Ag-MgO/water nanofluid under MHD naturalconvection and provided with a rotating circular barrier, while the right-angled corner is equipped with quarter-circle porousmedium and maintained at a fixed hot temperature T_h.Several parameters are tested such as Rayleigh number (10~3 ≤ Ra ≤ 10~6),Hartmann number (0 ≤ Ha ≤ 80) and Darcy number (10~(−5) ≤ Da ≤ 0.15). The obtained results depict the enhancing effect ofRa and the controlling role of the magnetic parameter on heat transport. Increasing the characteristics of the porous mediasuch as the porosity and the permeability showed a substantial impact on the heat transport efficiency within the enclosure.Moreover, the novelty findings in this paper are principally illustrated in the boosting impact of raising the porous mediumthickness when it is associated with the growing up of the heated parts of the geometry by increasing the dimension of theradius (r_p). Also, the rotational velocity (ω) and the radius (r_(ob)) of the circular obstacle are tested and showed an importantinfluence on the energy transport within the cavity. Moreover, the obtained results by modifying the length (a) prove itspertinent influence on the heat transfer performance.