کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4993298 | 1457616 | 2017 | 9 صفحه PDF | دانلود رایگان |
- A well resolved direct numerical simulation of wall jet is performed.
- Turbulent Prandtl number for wall jets is not a constant value.
- Heat transfer variables scale with inner, outer and thermal scales.
- Temperature variance and heat flux budgets are presented.
- Wall normal heat flux production is balanced by pressure diffusion.
A direct numerical simulation (DNS) of a wall jet is performed at Re=7500. To the authors' knowledge, this is the highest Reynolds number DNS study of a wall jet. The heat transfer process is studied with an iso-thermal boundary condition at the wall. The molecular Prandtl number is Pr=0.71. Mean flow and heat transfer parameters are contrasted with available measurements and Nusselt number coefficient correlations. The scaling parameters for heat transfer variables are investigated. The mean temperature â¨Tâ©, temperature root mean square Trms, streamwise â¨uâ²Tâ²â© and wall normal ãvâ²Tâ²ã heat flux profiles show collapse in the streamwise direction, with the inner scaling, the outer scaling and the thermal scaling parameters. The complete budgets for temperature variance â¨Tâ²Tâ²â© and turbulent heat fluxes are also presented.
Journal: International Journal of Heat and Fluid Flow - Volume 63, February 2017, Pages 99-107