溝を有する壁面チャネルにおける乱流熱伝達

抄録

Direct numerical simulations have been performed for turbulent heat and momentum transfer in a plane channel with streamwise rectangular grooves. The grooves are introduced by the immersed boundary method. The temperature is supposed to be a passive scalar, and the Prandtl number is set to unity. It is found that the simple streamwise grooves can enhance momentum and heat transfer in comparison to a smooth channel, leading to dissimilar heat transfer enhancement. For the fixed friction Reynolds number and the groove width and spacing, the dissimilarity between heat and momentum transfer is enhanced as the groove depth increases. The dissimilar heat transfer is associated with the appearance of large-scale intense spanwise rolls over the grooves.