High-Pr Heat Transfer in Viscoelastic Drag-Reducing Turbulent Channel Flow

In this study, direct numerical simulation (DNS) of heat transfer in a turbulent channel flow with Giesekus model was conducted at turbulent Reynolds number is 150, Prandtl number is 5 and Weissenberg number based on the friction velocity is 30. Temperature field was treated as a passive scalar and constant temperature difference condition was imposed at the wall. As the results, fundamental DNS database such as mean temperature, turbulent heat flux and turbulent Prandtl number were obtained. And heat transfer reduction rate exceeded drag reduction rate as well as previous DNS result by Yu and Kawaguchi (Int J Heat Mass Transf 48:4569-4578, 2005), despite of the Prandtl number distinction. © Springer 2010.