Turbulent Heat Flux Budgets in Viscoelastic Turbulent Channel Flows

This study employed direct numerical simulations with the FENE-P model to explore the influence of Prandtl number (Pr) Pr ) on turbulent heat transfer in viscoelastic turbulent channel flow (frictional Reynolds number of 125). Across Pr values ranging from 0.1 to 5.0, we analyzed the budgets for temperature variance and turbulent heat fluxes. At high Pr , the contribution of the temperature-pressure gradient term to the budget of wall-normal turbulent heat flux in Newtonian flows near the wall was significant. However, it diminished in viscoelastic flows; instead, the turbulent transport term became prominent. At low Pr , the dissipation term was significant for both Newtonian and viscoelastic flows.