Heat Transfer and Flow Friction Performance of Rotating Rectangular Channels with Different Dimple/Protrusion Structures

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Heat Transfer and Flow Friction Performance of Rotating Rectangular Channels with Different Dimple/Protrusion Structures

更新时间：2025-07-09

- Heat Transfer and Flow Friction Performance of Rotating Rectangular Channels with Different Dimple/Protrusion Structures
- Vol. 45, Issue 11, Pages: 52-57(2011)
- 作者机构：
  
  西安交通大学能源与动力工程学院,西安,710049
- 作者简介：
- 基金信息：
- DOI：
  CLC： V211.6
- Online First：10 November 2011，
  
  Published：2011
- 稿件说明：
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Heat Transfer and Flow Friction Performance of Rotating Rectangular Channels with Different Dimple/Protrusion Structures[J]. 2011, 45(11): 52-57.
DOI：

Heat Transfer and Flow Friction Performance of Rotating Rectangular Channels with Different Dimple/Protrusion Structures[J]. 2011, 45(11): 52-57. DOI：

摘要

采用数值模拟方法研究了旋转工况下球窝/球凸结构对通道传热特性和阻力特性的影响

利用SST k-ω湍流模型求解了黏性Navier-Stokes方程

其中矩形通道的一侧布置球凸

另一侧布置球窝

球窝/球凸的结构分为圆形、竖椭圆和横椭圆.研究结果表明:球凸的迎风前缘传热能力大大增强

背风后缘及其之后的尾迹区域出现流动分离且传热性能有所减弱; 球窝的前缘出现了流动分离且传热性能明显减弱

后半球窝处的分离流体再附使传热能力增强.通道旋转对传热阻力特性的影响很大

主要是旋转使得球窝/球凸表面的流动分离再附提前发生或延迟出现

后缘面流动分离再附频繁出现.比较3种通道发现:竖椭圆球窝/球凸通道和圆形球窝/球凸通道的平均Nu和摩擦系数几乎相等

横椭圆球窝/球凸通道的平均Nu和摩擦系数明显大于圆形、竖椭圆通道.

Abstract

A numerical simulation was performed to investigate the heat transfer and flow friction performance of rotating rectangular channels assigned with dimples and protrusions on each side. The viscous Navier-Stokes equations were solved using the shear-stress transport(SST)turbulence model. Three dimple/protrusion structures were discussed including circled dimple/protrusion

horizontal oval dimple/protrusion

and vertical dimple/protrusion. The results indicate that the heat transfer increases significantly near the windward side of the protrusion

and there is flow separation and the heat transfer near the leeward rim and in the wake region falls. On the dimple side

a higher heat transfer rate is observed in the region of shear layer reattachment on the second half of the dimple cavity while the first half of the cavity has the lower heat transfer rate because of flow separation. The channel rotation has great effect on heat transfer and friction performance because the rotation will affect the place where separation and reattachment occur and energize the flow near trailing surface. The comparison shows that the averageNu number and the friction ratio of the vertical dimple/protrusion channel are almost the same as those of the circular dimple/protrusion channel while the horizontal dimple/protrusion channel has larger average Nu and the friction ratio than the others.

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references

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