| Title |
Heat Transfer Enhancement in a Divergent Passage with 30° Inclined Ribs |
| Authors |
Myung Sung Lee ; Soo Whan Ahn |
| DOI |
https://doi.org/10.6110/KJACR.2017.29.8.401 |
| Keywords |
확대 채널 ; 리브 형상 ; 국부 열전달 ; 누셀트 수 ; 전 마찰계수 Divergent channel ; Rib geometries ; Local heat transfer ; Nusselt number ; Total friction factor |
| Abstract |
The effect of different rib geometries such as V-shaped continuous (case A), parallel broken (case B), and V-shaped broken (case C) ribs on local heat transfer distributions and pressure drops in a divergent channel with 30° inclined ribs on one wall or two walls was investigated for Reynolds numbers from 22,000 to 75,000. Top and bottom walls were insulated; two side walls were uniformly heated in the divergent channel. Heated walls were composed of 10 isolated coper sections and length-to-outlet hydraulic diameter ratio of 10. Rib height-to-outlet hydraulic diameter ratio was 0.1, and rib pitch-to-height ratio equaled 10. Results revealed that V-shaped continuous rib (case A) produced approximately 1.4 times higher average Nussselt number than in the parallel broken rib (case B), and V-shaped broken rib (case C) in the channel with two ribbed walls at Re = 54,000. |