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首页> 外文期刊>International Journal of Heat and Fluid Flow >Effect of Coriolis forces in a rotating channel with dimples and protrusions
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Effect of Coriolis forces in a rotating channel with dimples and protrusions

机译：带凹痕和突起的旋转通道中科里奥利力的影响

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摘要

Large-eddy simulations are used to investigate the effect of Coriolis forces and dimple depth on heat transfer and friction in a channel with dimples and protrusions on either side. Two geometries with two different dimple-protrusion depths, δ = 0.2 and 0.3 of channel height are investigated over a wide range of rotation numbers, Ro_b = -0.77 to 1.10 based on mean velocity and channel height. It is found that the dimple side of the channel is much more sensitive to destabilizing rotational Coriolis forces than the protrusion side of the channel, although both dimples and protrusions react to the stabilizing effects of Coriolis forces on the leading side. The dimpled surface on the trailing side experiences a large increase in heat transfer coefficient from an augmentation ratio of 1.9 for stationary flow to 3.5 at Ro_b = 0.77 for S = 0.2, and from 2.3 to a maximum of 3.8 for δ = 0.3. Placing protrusion on the trailing side, however, only increases the augmentation ratio to between 3.25 and 3.7 from the stationary values of 3.0 and 3.4 for δ = 0.2 and 0.3, respectively. The dimpled leading side experiences a large drop in heat transfer to between augmentation ratios of 1.1 and 1.4 for the two dimple depths. The protrusion surface on the leading side also experiences a large drop in augmentation from 3.0 for a stationary channel to 1.3 at Ro_b = 0.77 for δ = 0.2 and from 3.4 to 1.8 at Ro_b = 1.1 for δ = 0.3. The results lead to the conclusion that for low rotation numbers |Ro_b| < 0.2, placing protrusions on the trailing side is advantageous, whereas for |Ro_b| > 0.2, dimples on the trailing side of the duct give better overall performance. Between the two depths, the deeper dimple/protrusion (δ = 0.3) gives higher heat transfer augmentation at the price of more frictional losses ranging from 6 to 10 versus 3 to 5 for depth δ = 0.2.
机译：大涡流模拟用于研究科里奥利力和凹痕深度对两侧带有凹痕和突起的通道中的传热和摩擦的影响。基于平均速度和通道高度，研究了在两个旋转数Ro_b = -0.77至1.10的宽范围内，两个具有不同凹痕深度的几何形状的通道高度δ= 0.2和0.3的情况。已经发现，尽管凹坑和突起都对前侧的科里奥利力的稳定作用起反作用，但是通道的凹坑侧对不稳定的科里奥利旋转力比通道的突出侧更加敏感。尾端的凹坑表面的传热系数大大增加，从固定流量的增加比1.9增加到Ro_b = 0.77的3.5（S = 0.2）和δ= 0.3的2.3（最大值）。然而，将突出部放置在尾端仅将增大比率从δ= 0.2和0.3的固定值3.0和3.4分别增加到3.25和3.7之间。对于两个凹坑深度，凹坑的前导侧的传热大大降低，达到了1.1和1.4的增强比。前侧的突出表面的增大也从固定通道的3.0下降到Ro_b = 0.77时的1.3（对于δ= 0.2）和Ro_b = 1.1时从3.4到1.8的δ= 0.3。结果得出结论，对于低转数| Ro_b | <0.2，在后侧放置突起是有利的，而对于| Ro_b | > 0.2时，管道尾端的凹坑可提供更好的整体性能。在两个深度之间，更深的凹坑/凸起（δ= 0.3）以较高的摩擦损失为代价提供了更高的传热效果，摩擦损失的范围为6到10，而深度δ= 0.2则为3到5。

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  • 作者

    Mohammad A. Elyyan; Danesh K. Tafti;

  • 作者单位

    High Performance Computational Fluids-Thermal Sciences and Engineering Lab, Mechanical Engineering Department, Virginia Polytechnic Institute and State University. Blacksburg, VA 24061, USA;

    High Performance Computational Fluids-Thermal Sciences and Engineering Lab, Mechanical Engineering Department, Virginia Polytechnic Institute and State University. Blacksburg, VA 24061, USA;

  • 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

    LES; dimples; internal cooling; rotating channels;

    机译：LES;酒窝内部冷却;旋转通道;

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