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首页> 外文期刊>International Journal of Heat and Mass Transfer >Characteristics for flow and heat transfer around a circular cylinder near a moving wall in wide range of low Reynolds number
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Characteristics for flow and heat transfer around a circular cylinder near a moving wall in wide range of low Reynolds number

机译：低雷诺数范围内移动壁附近圆柱体周围的流动和传热特性

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摘要

The present study numerically investigates two-dimensional laminar fluid flow and heat transfer past a circular cylinder near a moving wall. Numerical simulations to calculate the fluid flow and heat transfer past a circular cylinder are performed for different Reynolds numbers varying in the range of 60-200 and a fixed Prandtl numbers of 0.7 (air) in the range of 0.1 ≤G/D ≤ 4, where G/D is the ratio of the gap between the cylinder and a moving wall, C and the cylinder diameter, D. The flow and thermal fields become the steady state below the critical gap ratios of 0.8, 0.4 and 0.2 for the Reynolds numbers of 60, 80 and 100, respectively. As the gap ratio decreases, the magnitude of lift coefficient for all Reynolds numbers increased significantly with diminishing G/D due to the ground effect. The cases of Reynolds numbers of 60,80 and 100 revealed the sharp slope of drag coefficient in the range of the gap ratio where the flow transfers from the unsteady state to the steady state. As the Reynolds number decreases, the variation of Nusselt is much significant and increases considerably with decreasing G/D.
机译：本研究从数值上研究了二维层流和流过靠近活动壁的圆柱体的热传递。对在60-200范围内变化的不同雷诺数和0.1≤G/ D≤4范围内的固定的普朗特数0.7（空气）进行数值模拟，以计算通过圆柱体的流体流动和传热。其中G / D是圆柱与活动壁之间的间隙C与圆柱直径D的比率。在雷诺数的临界间隙比率0.8、0.4和0.2以下时，流场和热场变为稳态分别为60、80和100。随着间隙比的减小，由于地面效应，所有雷诺数的升力系数的幅度都会随着G / D的减小而显着增加。雷诺数为60,80和100的情况表明，在间隙比范围内，流体从非稳态转移到稳态时，阻力系数急剧减小。随着雷诺数的减少，Nusselt的变化非常明显，并且随着G / D的降低而显着增加。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2010年第24期|p.5111-5120|共10页
  • 作者

    H.S. Yoon; J.B. Lee; J.H. Seo; H.S. Park;

  • 作者单位

    Advanced Ship Engineering Research Center, Pusan National University, San 30,Jang]eon Dong, Geum Jeong Gu, Busan 609-735, Republic of Korea;

    rnFluid Dynamics R&D Group, Daewoo Shipbuilding and Marine Engineering Co., Ltd., 1, Aju dong, Goje si, Gyoungnam 656-714, Republic of Korea;

    rnDepartment of Naval Architecture and Ocean Engineering, Pusan National University, San 30, Jang Jeon Dong, Geum Jeong Gu, Busan 609-735, Republic of Korea;

    rnDepartment of Naval Architecture and Ocean Engineering, Pusan National University, San 30, Jang Jeon Dong, Geum Jeong Gu, Busan 609-735, Republic of Korea;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 ger
  • 中图分类
  • 关键词

    circular cylinder; moving wall; ground effect; gap; nusselt number;

    机译：圆柱体活动墙;地面效应间隙;努塞尔数;

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