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Heat transfer augmentation in a circular tube with winglet vortex generators 被引量:1
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作者 Suriya Chokphoemphun Monsak Pimsarn +1 位作者 Chinaruk Thianpong Pongjet Promvonge 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2015年第4期605-614,共10页
The article presents the influence of winglet vortex generators (WVGs) placed in the core flow area on ther- mal performance enhancement of a tube heat exchanger. The experiment was carried out in a uniform wall hea... The article presents the influence of winglet vortex generators (WVGs) placed in the core flow area on ther- mal performance enhancement of a tube heat exchanger. The experiment was carried out in a uniform wall heat-fluxed tube by varying turbulent airflow for Reynolds number ranging from 5300 to 24000. In the pres- ent work, the WVGs with an attack angle of 30° were inserted into the test tube at four different winglet pitch ratios (Rp = P/D) and three winglet-width or blockage ratios (Ra = e/D). The experimental results at various Rp and RB values were evaluated and compared with those for smooth tube and tubes with twist- ed tape or wire coil. The measurement reveals that the WVGs enhance considerably the heat transfer and friction loss above the plain tube, wire coil and twisted tape. The Nusselt number and friction factor increase with the increment Of RB and Re but with the decreasing Rp. The average Nusselt numbers for the WVGs with various Ra are in the range of 2.03-2.34 times above the plain tube. The thermal performance for the WVGs is found to be much higher than that for the wire coil and twisted tape and is in a range of 1.35-1.59. Also, a numerical investigation is conducted to study the flow structure and heat transfer enhancement mecha- nisms in the winglet-inserted tube. 展开更多
关键词 Nusselt numberFriction factorThermal enhancement factorWingletVortex generator
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宽通道换热板片结构的多目标头脑风暴优化设计 被引量:1
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作者 郭一楠 蒋东章 +1 位作者 王瑞茹 巩敦卫 《控制与决策》 EI CSCD 北大核心 2022年第9期2314-2322,共9页
换热板片作为构成宽通道板式换热器的核心部件,对其换热效果具有直接影响.为有效提升换热器性能,减少能量损耗,提出一种宽通道换热板片结构的多目标头脑风暴优化设计方法.首先,根据换热板片的形状和布局特点,提取梯形凸台尺寸及其分布... 换热板片作为构成宽通道板式换热器的核心部件,对其换热效果具有直接影响.为有效提升换热器性能,减少能量损耗,提出一种宽通道换热板片结构的多目标头脑风暴优化设计方法.首先,根据换热板片的形状和布局特点,提取梯形凸台尺寸及其分布间隔构成结构参数,采用正交法,基于Fluent数值模拟软件获得25组换热板片结构样本;然后,采用回归构建换热努塞尔数和压力损失的代理模型,以最大换热效果和最小能量损耗作为优化目标,采用基于网格的多目标头脑风暴优化算法,寻优获得最佳换热板片的结构设计方案.统计实验结果表明,换热性能代理模型可以有效降低评价代价,所提出优化设计方法可以更加高效地获得具有最佳换热效果和能量损耗的换热板片结构. 展开更多
关键词 宽通道换热板片 代理模型 多目标头脑风暴优化 换热努塞尔数 压力损失
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