DNS による空間発達する壁面噴流乱流熱伝達場の構造解析

抄録

The objective of this study is to investigate and observe characteristics of heat transfer phenomena in a spatially-developing wall jet turbulent flow by means of direct numerical simulation, where the wall is heated from midstream of field by an iso-thermal or an iso-heat flux boundary conditions, i.e., an entrance region of thermal field is formed. In the velocity field, the maximum mean velocity in the streamwise direction decreases in the downstream region, and Reynolds shear stress in the outer region remarkably increases in comparison with that in the inner region. As for the thermal field, distributions of mean temperature and Nusselt number in the entrance region of thermal field are clearly shown by DNS, in which it is clearly observed that the thermal boundary layer of the iso-thermal wall condition rapidly develops as compared with that of the iso-heat flux wall condition. Developments of wall-normal turbulent heat fluxes in the entrance region of thermal field are also revealed.