Abstract
The turbulent momentum and heat transfers were investigated using the equations of motion and of energy written in Lagrangian description. The correlation between pressure gradient and vertical velocity depresses the Reynolds stress while the corresponding term due to the mean temperature gradient in the streamwise direction enhances the turbulent heat transfer, which leads the dissimilarity between momentum and heat transfer. The results of numerical analysis using DNS data verifies the above expectation although those effects are relatively small compared with the mixing type momentum or heat transfers.
