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 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 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.
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机译：本文显示了将钝体放置在平行板风道中并与之隔开一定距离时，风道与风道壁之间的间隙长度以及风道高度对风道传热特性和流动特性的影响。管壁作为湍流促进剂。在间隙长度与体高之比C / D = 0.05〜0.1时，传热的特征是重新分离了与体分离的剪切流。此外，传热取决于C / D = 0.15〜0.2时的再附着流和分离涡，以及C / D = 0.25和0.275时由Karman涡引起的侧涡。在较低的雷诺数下，再附着流具有增强传热的优异效果，但是在较大的雷诺数下，由卡曼涡旋引起的侧涡对增强传热变得更加有效。
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