| Title |
Effects of Aspect Ratio on Local Heat/Mass Transfer in Wavy Duct |
| Keywords |
Wavy duct ; 주름진 덕트 ; Aspect ratio ; 종횡비 ; Taylor-Gortler vortex ; 테일러-괴틀러 와류 ; Primary surface heat exchanger ; primary surface형 열교환기 ; Naphthalene sublimation technique ; 나프탈렌 승화법 |
| Abstract |
The present study investigates the convective heat/mass transfer characteristics in wavy ducts of a primary surface heat exchanger. The effects of duct aspect ratio and flow velocity on the heat/mass transfer are investigated. Local heat/mass transfer coefficients on the corrugated duct sidewall are determined using a naphthalene sublimation technique. The aspect ratios of the wavy duct are 7.3, 4.7 and 1.8 with the corrugation angle of 145º. The Reynolds numbers, based on the duct hydraulic diameter, vary from 300 to 3,000. The results show that at the low Re(Re≤1000) the secondary vortices called Taylor-Gortler vortices perpendicular to the main flow direction are generated due to effect of duct curvature. By these secondary vortices, non-uniform heat/mass transfer coefficients distributions appear. As the aspect ratio decreases, the number of cells formed by secondary vortices are reduced and secondary vortices and corner vortices mix due to decreased aspect ratio at Re≤1000. At Re＞1000, the effects of corner vortices become stronger. The average Sh for the aspect ratio of 7.3 and 4.7 are almost same. But at the small aspect ratio of 1.8, the average Sh decreases due to decreased aspect ratio. More pumping power(pressure loss) is required for the larger aspect ratio due to the higher flow instability. |