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首页> 外文会议>HTD-vol.376-2; ASME(American Society of Mechanical Engineers) International Mechanical Engineering Congress and Exposition; 20051105-11; Orlando,FL(US) >TRANSITION PROCESS TO TURBULENT FLOW IN POROUS MEDIA
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TRANSITION PROCESS TO TURBULENT FLOW IN POROUS MEDIA

机译：多孔介质中湍流的过渡过程

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摘要

Turbulence in porous media has attracted much interest recently, and many turbulence models have been proposed. However, the mathematical treatments in some turbulence models have been developed without reference to the unique structure of vortices in porous media. The further development of the turbulence model and the theoretical argument in the transition flow regime need the experimental verification of the microscopic flow field in porous media, but the geometric complexity of porous media brings about technical difficulties of the measurement and the visualization. Therefore, we adopt the flow through a bank of cylinders in a narrow gap as a model for the flow through porous media, and perform the PIV (Particle Image Velocimetry) and LIF (Laser Induced Fluorescence) techniques to examine the microscopic flow field in porous media. We have confirmed that the solid matrix in porous media plays an important role in the vortex diffusion. The large vorticity at the throat produces such vortex as the swirl flow. On the other hand, the obstruction due to the solid matrix forces such large vortex as a Karman vortex to be dissipative. Furthermore, the present experimental results are in agreement with our model for the production and dissipation of turbulence.
机译：多孔介质中的湍流近来引起了人们的极大兴趣，并且已经提出了许多湍流模型。然而，已经在不参考多孔介质中涡旋的独特结构的情况下开发了一些湍流模型中的数学方法。湍流模型的进一步发展和过渡流动状态下的理论论证需要对多孔介质中微观流场的实验验证，但是多孔介质的几何复杂性带来了测量和可视化的技术难题。因此，我们采用在狭窄间隙中通过一排圆柱体的流动作为通过多孔介质的流动的模型，并执行PIV（颗粒图像测速）和LIF（激光诱导荧光）技术来检查多孔中的微观流场媒体。我们已经证实，多孔介质中的固体基质在涡流扩散中起着重要作用。喉咙处的大涡流会产生涡流，如涡流。另一方面，由于固体基质引起的阻塞迫使诸如卡曼涡旋这样的大涡旋消散。此外，目前的实验结果与我们的湍流产生和消散模型相吻合。

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