Heat transfer enhancement in duct with blunt body inserted close to its wall

✍ Scribed by Kenyu Oyakawa; Yasuaki Kourogi; Minoru Yaga; Yoshitaka Miyafuji

• Publisher: John Wiley and Sons
• Year: 2005
• Tongue: English
• Weight: 842 KB
• Volume: 34
• Category: Article
• ISSN: 1099-2871
• DOI: 10.1002/htj.20067

✦ Synopsis

This paper shows the effects of clearance length between a body and a duct wall, and duct height on the heat transfer characteristics and flow behavior at a downstream region of the body when a blunt body was set in a parallel plate duct with some distance separating it from the duct wall as a turbulence promoter. For the ratio of clearance to body height, C/D = 0.05-01, the heat transfer was characterized by the reattachment of shear flow separated from the body. Furthermore, the heat transfer depended on both the reattachment flow and the separation vortex at C/D = 0.15-0.2, and the side vortex induced by Karman vortex at C/D = 0.25-0.275 was also observed. We found the reattachment flow gives a superior effect to enhance heat transfer at a low Reynolds number, but at a larger Reynolds number, the side vortex induced by Karman vortex becomes more effective to heat transfer enhancement.