공기충돌분류에서의 열전달 특성에 관한 수치적 연구

초록

The heat transfer characteristics for air jet vertically impinging on a flat plate which had a set of hybrid rod was investigated numerically using the RNG tubulent model in the commercial finite-volume code FLUENT. The rod had a cross section made with a half of circular and rectangular cross section. The heating surface was given constant heat flux value of 1020 W/㎡℃ and the problem parameters investigated were jet Reynolds number, nozzle-to-plate spacing, the rod pitch and rod-to-plate clearance. The local and local average Nusselt number characteristics were found to be dependent on the rod pitch and clearance because the flow was disturbed by installing the rod. Higher convective heat transfer rate occurred in the whole plate as well as in the wall jet region.