Abstract
A direct numerical simulation (DNS) of turbulent heat transfer in a channel flow was carried out to investigate turbulent heat transfer mechanism of drag-reducing surfactant solution. The configuration was a fully-developed turbulent channel flow with uniform heat flux imposed on both the walls. The temperature was considered as a passive scalar with the effect of buoyancy force neglected. A Giesekus model was used to model the extra stress associated with the deformation of the network microstructure formed by rod-like micellar structures. The Reynolds number based on the friction velocity and half the channel height was 150. Statistical quantities such as root-mean-square temperature fluctuations, turbulent heat fluxes and turbulent Prandtl number were obtained and compared with those of a Newtonian fluid flow. Budget terms of the turbulent heat fluxes were also presented.
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