Effects of using nanoliquid and double porous elliptic objects on the flow separation and convective heat transfer control for flow over multiple heated blocks in channel are numerically investigated by using finite element method. Spherical, brick, blade and cylindrical shaped alumina particles are used in water up to solid volume fraction of 2%. Impacts of Reynolds number (50≤Re ≤ 500), permeability of the porous ellipses (10⁻⁵≤Da₁≤5 × 10⁻² and 10⁻⁵≤Da₂≤5 × 10⁻²), aspect ratio of the ellipses (0.25≤AR₁≤1.5, 0.25≤AR₂≤1.5), distance between the ellipses (0.2H ≤ sx ≤ 1.6H) and distance of the first ellipse from inlet (−H ≤ mx ≤ H) on the hydro-thermal performance are explored. The highest performance improvement is obtained by using the cylindrical shaped particles in the base heat transfer fluid at the highest solid volume fraction and the amount of heat transfer enhancement are 33% and 40.5% for hot blocks while negligible pressure drop is observed. Varying the aspect ratio of the ellipses in the perpendicular direction to the flow, up to 25% and 30% heat transfer increment are obtained for hot block with slight rise of pressure coefficient. However, when varying the horizontal location of the porous ellipses in the channel and permeability of them, there is considerable rise of pressure drop. Variation of the average heat transfer from the hot blocks with varying permeability of the ellipses are obtained as 32% and 25%. Successful hydro-thermal performance estimation results are achieved by using artificial neural networks with feed-forward network architecture of 1 hidden layer and 17 neurons.

采用有限元方法数值研究了纳米液体和双多孔椭圆体对通道内多个加热块流动的流动分离和对流传热控制的影响。球形、砖块、叶片和圆柱形氧化铝颗粒用于水中固体体积分数高达 2%。雷诺数 (50≤ Re  ≤ 500)、多孔椭圆渗透率 (10 ^-5 ≤ Da ₁ ≤5 × 10 ^-2和 10 ^-5 ≤ Da ₂ ≤5 × 10 ^-2 )、椭圆长径比的影响(0.25≤ AR ₁ ≤1.5, 0.25≤ AR ₂≤1.5)，椭圆之间的距离 (0.2 H  ≤  sx  ≤ 1.6 H ) 和第一个椭圆到入口的距离 (− H  ≤  mx  ≤  H) 对水热性能进行了探讨。通过在固体体积分数最高的基础传热流体中使用圆柱形颗粒获得了最高的性能改进，并且热块的传热增强量为 33% 和 40.5%，同时观察到可忽略不计的压降。改变垂直于流动方向的椭圆长径比，压力系数略有上升的热块可获得高达25%和30%的传热增量。然而，当改变通道中多孔椭圆的水平位置和它们的渗透率时，压降会显着增加。随着椭圆的不同渗透率，热块的平均传热变化分别为 32% 和 25%。