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Enhancement of heat transfer in turbulent channel flow over dimpled surface

机译：增强凹坑表面湍流通道中的传热

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摘要

A systematic numerical investigation of heat transfer in turbulent channel flow over dimpled surface is conducted. Both symmetric (or spherical) and asymmetric dimple with different depth ratios (h/D) and skewness (Dx and Dz) are considered for a series of Reynolds numbers Re_(2H) (based on bulk velocity and full channel height) between 4000 and 6000 while Prandtl number Pr is fixed at 0.7. It is found that the optimum dimple configuration for enhancing heat transfer measured in terms of the volume goodness factor is obtained for the case of asymmetric dimple with a depth ratio of h/D = 15% and stream-wise skewness of Dx = 15%. The heat transfer capacity in terms of Nusselt number is significantly increased, while the associated pressure loss is kept almost to the same level as the symmetric dimple with the same depth ratio. The present study also suggests that the heat transfer enhancement is closely related to ejection with counter-rotating flow, intensified secondary flow and vortex structures at the downstream rim of asymmetric dimple. All these findings suggest that a carefully designed asymmetric dimpled surface presents a viable means of enhancing heat transfer compared to the symmetric dimple.
机译：对湍流在凹坑表面的传热进行了系统的数值研究。对于一系列雷诺数Re_（2H）（基于体速度和全通道高度），在4000至4000之间，考虑了具有不同深度比（h / D）和偏斜度（Dx和Dz）的对称（或球形）和非对称酒窝。 6000，而Prandtl数Pr固定为0.7。已经发现，对于具有h / D ＝ 15％的深度比和Dx ＝ 15％的流向偏斜的非对称凹痕的情况，获得了根据体积良性因子测量的用于增强传热的最佳凹痕构造。以努塞尔数表示的传热能力显着提高，同时相关的压力损失几乎保持在与具有相同深度比的对称凹痕相同的水平。本研究还表明，传热的增强与不对称酒窝下游边缘的反向旋转射流，二次流动加剧和涡流结构密切相关。所有这些发现表明，与对称凹痕相比，精心设计的非对称凹坑表面是增强传热的可行方法。

著录项

  • 来源
    《International Journal of Heat and Mass Transfer》 |2012年第26期|p.8100-8121|共22页
  • 作者

    Yu Chen; Yong Tian Chew; Boo Cheong Khoo;

  • 作者单位

    Department of Mechanical Engineering, National University of Singapore, Singapore 117576, Singapore;

    Department of Mechanical Engineering, National University of Singapore, Singapore 117576, Singapore;

    Department of Mechanical Engineering, National University of Singapore, Singapore 117576, Singapore;

  • 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 eng
  • 中图分类
  • 关键词

    heat transfer; dimple; DES; turbulent channel flow;

    机译：传播热量;酒窝;DES;湍流通道;

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