| Title |
Heat Transfer and Flow Characteristics by Trapezoid Rod Array in Impinging Jet System |
| Keywords |
Impinging jet ; 충돌제트 ; Trapezoid rod ; 사다리형 로드 ; Turbulence promoter ; 난류촉진체 ; Clearance ; 간극 |
| Abstract |
The objective of this study was to investigate the characteristics of jet flow and heat transfer caused by trapezoid rods array in impinging jet system. In this study, trapezoid rods have been set up in front of flat plate to serve as a turbulence promoter. The bottom width of trapezoid rod was 4, 8 mm and oblique angle were 80 . The space from rods to the heating surface was 1, 2, 4 mm, the pitch between each rods was 30, 40, 50 mm, and the distance from nozzle exit to flat plate was 100, 500 mm. This results were compared with the case without trapezoid rods.
As a result, when rods are installed in front of the impinging plate, the acceleration of the jet flow and the eddies due to the rods seem to contribute to the heat transfer enhancement. Among test conditions, the heat transfer performance was best for the condition of 8 mm, 1 mm, 30 mm and 10. The maximum heat transfer rate is about 1.9 times larger than that without trapezoid rods. |