Dissimilar heat transfer enhancement in porous channel turbulence

在壁上的小孔隙率的情况下，与不可渗透的壁相比，在表面摩擦系数或斯坦顿数方面没有观察到显著差异。然而，对于大的壁孔隙率，湍流的热量和动量传递被发现是显着增强的多孔壁的引入。弱但不可忽略的相异性，即，较高的斯坦顿数和较低的表面摩擦系数，观察之间的热量和动量传递。这种差异的物理机制解释的相关性的大型展向辊与其诱导的湍流热通量和雷诺应力。

In case of small porosity on the wall, no significant difference has been observed in a skin friction coefficient or the Stanton number in comparison to an impermeable wall. For large wall porosity, however, turbulent heat and momentum transfer is found to be remarkably enhanced by the introduction of the porous wall. Weak but non-negligible dissimilarity, i.e., the higher Stanton number and the lower skin friction coefficient, is observed between heat and momentum transfer. The physical mechanism of this dissimilarity is interpreted in terms of the relevance of the large-scale spanwise rolls with their induced turbulent heat flux and Reynolds stress.