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闫顺林,张莎,何仑. 凹坑结构对麻面管流动与传热特性的影响分析[J]. 科学技术与工程, 2020, 20(1): 196-201.
yan shunlin,he lun.Analysis of Influence of Pit Structure on Flow and Heat Transfer Characteristics of Pitted Tube[J].Science Technology and Engineering,2020,20(1):196-201.
凹坑结构对麻面管流动与传热特性的影响分析
Analysis of Influence of Pit Structure on Flow and Heat Transfer Characteristics of Pitted Tube
投稿时间:2019-05-13  修订日期:2019-09-06
DOI:
中文关键词:  凹坑结构 高径比 麻面管 流动特性 强化传热
英文关键词:pit structure  height to diameter ratio  pitted tube  flow characteristics  enhanced heat transfer
基金项目:
        
作者单位
闫顺林 华北电力大学能源动力与机械工程学院
张莎 华北电力大学能源动力与机械工程学院
何仑 华北电力大学能源动力与机械工程学院
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中文摘要:
      采用三维数值模拟方法,分析不同进口油速(0.6~1.8 m/s)、凹坑高径比(0.45、0.474、0.5、0.529、0.563、0.6)对麻面管流动与传热特性的影响。结果表明:高径比越小,凹坑内旋涡区越扁平;不同高径比凹坑内旋涡位置不同,同时对麻面管性能的影响也不同;相同进口油速下,麻面管的努塞尔数均高于光管,阻力系数均低于光管;相同进口油速下,随高径比增加,努塞尔数先增加后减小,阻力系数先减小后增加;麻面管在凹坑高径比为0.5时综合传热效果最好,此时为最优凹坑结构。
英文摘要:
      Three-dimensional numerical simulations were conducted to investigate the influence of different imported oil speed (0.6~1.8 m/s) and height to diameter ratio (0.45、0.474、0.5、0.529、0.5635、0.6) on the flow and heat transfer characteristics of the pitted tube. The results show that the smaller the height to diameter ratio is, the flatter the vortex area in the pit is.The vortex positions of the pits are different because of the different height-diameter ratios, causing the influence on the characteristics of tube is also different. At the same imported oil speed, the Nussel number of the pitted pipe is higher than that of the light pipe, and the resistance coefficient is lower than that of the light pipe. At the same imported oil speed, the Nusselt number increases first then decreases, and the drag coefficient decreases first then increases along with the increase of height-diameter ratios. The pitted tube has the best comprehensive heat transfer effect when the height to diameter ratio is 0.5, which is the optimal pit structure.
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