Dissimilar heat transfer enhancement in porous channel turbulence

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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.