This study is a computational investigation of transient thermogravitational energy transport in H₂O/Al₂O₃ nanoliquid and water-based copper/aluminum oxide hybrid nanofluid (water/Al₂O₃-Cu) inside a horizontal isosceles triangular enclosure with porous medium. The governing equations for two-phase mixture flow have been derived by the use of Darcy-Brinkman model for porous media without the Forchheimer term (inertia loss). The control equations have been discretized using the finite volume technique. The effects of porosity factor, Rayleigh number, and Darcy number on the liquid motion and transient energy transport have been studied. The results have shown that convective thermal transmission in the nanofluid inside the triangular cavity generally consists of three phases: initial, transient, and quasi-steady, all of which are described in detail. It has been found that a rise of the porosity factor, Rayleigh number, or Darcy number always leads to an increment of the average Nusselt number and energy transport intensity. It has been also observed that with a rise of the Darcy number and strengthening of flow motion (convection), the instability in both flow and temperature fields increases and the distribution of isotherms and streamlines becomes completely asymmetric.

这项研究是对H ₂ O / Al ₂ O ₃纳米液体和水基铜/氧化铝混合纳米流体（水/ Al ₂ O _3）中瞬态热引力能量传输的计算研究。-Cu）在带有多孔介质的水平等腰三角形外壳中。对于不带Forchheimer项（惯性损失）的多孔介质，使用Darcy-Brinkman模型可以得出两相混合物流的控制方程。控制方程已经使用有限体积技术离散化了。研究了孔隙率，瑞利数和达西数对液体运动和瞬态能量传输的影响。结果表明，三角形空腔内纳米流体中的对流热传递通常由三个阶段组成：初始阶段，瞬态阶段和准稳态阶段，所有这些阶段均已详细描述。已经发现，孔隙率，瑞利数或达西数的增加总是导致平均努塞尔数和能量传输强度的增加。