入口乱れが誘起された円管内助走区間乱流熱伝達のDNS

抄録

The object of this study is to investigate and observe characteristics of turbulenet heat transfer phenomena in an entrance region of wall-heated pipe flow by means of direct numerical simulation (DNS). In order to reproduce the entrance region of both velocity and thermal turbulent boundary layers in a pipe, an obstacle which induces a turbulence is mounted on the wall near the inlet of pipe, and the wall is set under isoflux thermal condition. Such conditions in DNS is successfully carried out to reproduce the entrance region of pipe. Thus, characterisc dtributions of turbulent statistical quantities in entrance of a pipe are clearly obtained by the DNS. In the downstream region, the velocity and thermal fields simultaneously develop, and almost development turbulent flow with heat transfer in a pipe can be observed. Therefore, DNS reveals characteristics and structures of entrance region of pipe.