| Title |
Effect of Rib Angle on Thermal Performance in a Two Wall Convergent/Divergent Channel with Ribs on One Wall |
| Authors |
Soo Whan Ahn ; Myung Sung Lee ; Sung Taek Bae |
| DOI |
http://dx.doi.org/10.6110/KJACR.2015.27.4.195 |
| Keywords |
수축/확대 직사각 채널 ; 열전달 ; 전마찰계수 ; 리브 각도 ; 열성능 Convergent/divergent rectangular channel ; Heat transfer ; Total friction factor ; Rib angle ; Thermal performance |
| Abstract |
The thermal performance in the channels with two-wall rectangular convergent/divergent cross-sectional areas along the axial distance was investigated experimentally. The ribbed rectangular convergent/divergent channels were manufactured with a fixed rib height (e) = 10 mm and the ratio of rib spacing (p) to height (e) = 10. Three different parallel angled ribs (a = 30°, 45°, and 60°) were each placed on the channel’s one sided wall only. The convergent channel of Dho/Dhi = 0.67 and the divergent channel of Dho/Dhi = 1.49 were considered. The ribbed divergent channel produced better thermal performance than the ribbed convergent channel in three different restrictions; identical flow rate, identical pumping power, and identical pressure loss. |