交叉间断肋片与凹槽强化传热的实验与数值研究

CIESC Journal ›› 2012, Vol. 20 ›› Issue (2): 220-230.

交叉间断肋片与凹槽强化传热的实验与数值研究

唐新宜, 朱冬生

Key Laboratory of Enhanced Heat Transfer and Energy Conservation of the Ministry of Education, South China University of Technology, Guangzhou 510640, China

收稿日期:2011-11-24 出版日期:2012-04-28 发布日期:2012-02-25

Experimental and numerical study on heat transfer enhancement of a rectangular channel with discontinuous crossed ribs and grooves

TANG Xin-Yi, ZHU Dong-Sheng

Key Laboratory of Enhanced Heat Transfer and Energy Conservation of the Ministry of Education, South China University of Technology, Guangzhou 510640, China

Received:2011-11-24 Online:2012-04-28 Published:2012-02-25

摘要/Abstract

摘要： Experimental and numerical investigations have been conducted to study turbulent flow of water and heat transfer characteristics in a rectangular channel with discontinuous crossed ribs and grooves. The tests investigated the overall heat transfer performance and friction factor in ribbed and ribbed-grooved channels with rib angle of 30°. The experimental results show that the overall thermo-hydraulic performance for ribbed-grooved channel is increased by 10%-13.6% when compared to ribbed channel. The investigation on the effects of different rib angles and rib pitches on heat transfer characteristics and friction factor in ribbed-grooved channel was carried out using Fluent with SST (shear-stress transport) k-ω turbulence model. The numerical results indicate that the case for rib angle of 45° shows the best overall thermo-hydraulic performance, about 18%-36% higher than the case for rib an-gle of 0°. In addition, the flow patterns and local heat transfer characteristics for ribbed and ribbed-grooved chan-nels based on the numerical simulation were also analyzed to reveal the mechanism of heat transfer enhancement.

关键词: heat transfer enhancement, rib, groove, rectangular channel, turbulent flow

Abstract: Experimental and numerical investigations have been conducted to study turbulent flow of water and heat transfer characteristics in a rectangular channel with discontinuous crossed ribs and grooves. The tests investigated the overall heat transfer performance and friction factor in ribbed and ribbed-grooved channels with rib angle of 30°. The experimental results show that the overall thermo-hydraulic performance for ribbed-grooved channel is increased by 10%-13.6% when compared to ribbed channel. The investigation on the effects of different rib angles and rib pitches on heat transfer characteristics and friction factor in ribbed-grooved channel was carried out using Fluent with SST (shear-stress transport) k-ω turbulence model. The numerical results indicate that the case for rib angle of 45° shows the best overall thermo-hydraulic performance, about 18%-36% higher than the case for rib an-gle of 0°. In addition, the flow patterns and local heat transfer characteristics for ribbed and ribbed-grooved chan-nels based on the numerical simulation were also analyzed to reveal the mechanism of heat transfer enhancement.

Key words: heat transfer enhancement, rib, groove, rectangular channel, turbulent flow

唐新宜, 朱冬生. 交叉间断肋片与凹槽强化传热的实验与数值研究[J]. CIESC Journal, 2012, 20(2): 220-230.

TANG Xin-Yi, ZHU Dong-Sheng. Experimental and numerical study on heat transfer enhancement of a rectangular channel with discontinuous crossed ribs and grooves[J]. , 2012, 20(2): 220-230.

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