Heat Transfer Enhancement in Duct with Blunt Body Inserted Close to Its Wall
流路内壁面近くに置かれた鈍頭物体による伝熱促進

Kenyu OYAKAWA, Yasuaki KOUROGI, Minoru YAGA, Yoshitaka MIYAFUJI
2004 TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B  
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 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. At the ratio of clearance length to body height, C/D= 0.05-0.1, the heat transfer was characterized by the reattachment of shear flow separated from the body. Furthermore, the heat
more » ... fer 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 and 0.275. The reattachment flow gives a superior effect to enhance heat transfer at low Reynolds number, but at larger Reynolds number, the side vortex induced by Karman vortex becomes more effective to heat transfer enhancement.
doi:10.1299/kikaib.70.459 fatcat:zmbw72artbbn3poyyjtpz7pbm4