Abstract A confined slot jet impinging into an open trapezoidal cavity containing a porous layer is investigated. To make the study accounts for a practical problem, constant heat flux is applied at the bottom of the cavity which is covered by a thin porous layer subjected to a cold impingement air jet. Darcy-Forchheimer model is used for the porous layer and its porosity range was taken to ensure thermal equilibrium between the fluid and the porous matrix. Finite element method is adopted for the numerical solution. Results show that the best thickness of the porous layer should be as minimal as possible, where increasing the porous layer thickness from 0.1 to 0.3 reduces the average Nusselt number by 17% when Darcy number is 10−3. It is found also that the trapezoidal cavity serves in attaining the fully developed condition early.

中文翻译：

---

将射流冲击到部分填充有多孔层的开放梯形空腔中

摘要 研究了碰撞到包含多孔层的开放梯形腔的受限狭缝射流。为了使研究解决一个实际问题，在空腔底部施加恒定的热通量，该空腔底部覆盖着一层薄薄的多孔层，受到冷冲击空气射流的影响。Darcy-Forchheimer 模型用于多孔层，其孔隙率范围被用来确保流体和多孔基体之间的热平衡。数值求解采用有限元法。结果表明，多孔层的最佳厚度应尽可能小，当达西数为 10−3 时，将多孔层厚度从 0.1 增加到 0.3 会使平均努塞尔数降低 17%。还发现梯形腔有助于早期达到完全发育的状态。