SINOPSIS

Dissimilar heat transfer enhancement is achieved in a fully developed turbulent channel flow where the averaged momentum and heat transport equations have identical form. The spatio-temporal distribution of the wall blowing/suction is determined by the suboptimal and optimal control theories. Although the control performance achieved in the optimal control is better than that in the suboptimal control, the control inputs optimized by both strategies exhibit a similar downstream traveling wave-like property. The present results indicate that the essential difference between the divergence-free velocity vector and the conservative scalar is a key to achieve dissimilarity between momentum and heat transfer.