Local characteristics in converging-diverging tube with delaying self-sustaining swirl flow
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HONG Mengna;DENG Xianhe
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缩放管内带衰减性自旋流的局部性能
洪蒙纳;邓先和
华南理工大学教育部传热强化与过程节能重点实验室,广东 广州 510640;广东省节能中心,广东 广州 510030
Abstract:
The distributions of thermal resistance in viscous sublayer,buffer region and turbulent core region,local flow resistance and local heat transfer characteristics at different locations downstream of the twisted-tape element were numerically studied in a converging-diverging tube inserted with spaced twisted-tape element by analyzing the attenuation of self-sustaining swirl flow.The results showed that the local performance was poor as thermal resistance was too concentrated in its distribution for a particular region.The more uniform the distribution of thermal resistance,the better the local performance.The local performance reached its best when the fluid just left the spaced twisted-tape,in which the flow resistance dropped substantially but the enhancement of heat transfer was still significant.The self-sustaining flow was maintained at a long distance.The best performance was at the length of 36.85 times the diameter,increasing by 6.8% compared with a converging-diverging tube.
HONG Mengna;DENG Xianhe.
洪蒙纳;邓先和.
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URL: https://hgxb.cip.com.cn/EN/
https://hgxb.cip.com.cn/EN/Y2009/V60/I8/1944