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首页> 外文期刊>Japanese Journal of Applied Physics. Part 1, Regular Papers, Brief Communications & Review Papers >Flow Structure in an Inner Rotating Annular Channel with Ribbed Wall Cylinder
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Flow Structure in an Inner Rotating Annular Channel with Ribbed Wall Cylinder

机译：带肋圆柱内旋转环形通道内的流动结构

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摘要

In this investigation, we explore the flow field of an annular channel between two horizontal concentric rotating cylinders, i.e., between a rotating inner cylinder and a stationary outer cylinder. Resulting from interactions between centrifugal force, viscous force and different boundary conditions, flow fields in an annular channel probably develop groups of opposite Taylor vortices when the Taylor number is higher than a critical value. Geometrical parameters of rotating cylinder channels, such as the channel widths and circumferential ribs are also affected by the flow field. Four types of rotating inner cylinder are available in this experiment: smooth walled (Model A), and circumferential ribs of three different sizes (Models B-D). The aspect ratios for circumferential ribs are 5/3, 5/2, and 10/3, which generate periodically embedded cavities of 10, 15, and 20 mm. The radius ratios between the inner and outer cylinders were η_s = 0.89, and η_(rib) = 0.94, respectively. Taylor numbers ranged between (8.565-1312.943) x 10~3, and centrifugal force arising from the rotation of Model A was F_s = 0.22-3.3 N. The centrifugal forces arising from the inner cylinders with embedded circumferential ribs were F_(rib) = 0.23-3.49 Nt. Because the wavelength of the Taylor vortices was subjected to the influence of different geometrical conditions, the flow field structure of Model A was different at both ends of the cylinder. Conversely, various forms of Taylor vortices occurred between annular channels with circumferential ribs in the case of Models B-D, and the vortex evolved from the edge of the circumferential ribs in a more stable manner than in Model A. The wavelengths of the Taylor vortices were λ_A = 30 mm, λ_B and λ_D = 20 mm, and λ_C = 15 mm. Experimental results of flow visualization demonstrated it to be well suited for benchmarking engineering designs for heat transfer, cooling, and tribology of rotating machinery.
机译：在这项研究中，我们探索了两个水平同心旋转圆柱体之间，即旋转的内部圆柱体与固定的外部圆柱体之间的环形通道的流场。由于离心力，粘性力和不同边界条件之间的相互作用，当泰勒数高于临界值时，环形通道中的流场可能会形成一组相反的泰勒涡旋。旋转圆柱通道的几何参数，例如通道宽度和圆周肋，也受流场影响。在此实验中，可以使用四种类型的旋转内筒：光滑壁（A型）和三种不同尺寸的圆周肋（B-D型）。圆周肋的长宽比为5 / 3、5 / 2和10/3，它们会定期产生10、15和20 mm的内腔。内圆柱和外圆柱之间的半径比分别为η_s= 0.89和η_（rib）= 0.94。泰勒数在（8.565-1312.943）x 10〜3之间，模型A旋转产生的离心力为F_s = 0.22-3.3N。内嵌有圆周肋的内圆柱体产生的离心力为F_（rib）= 0.23-3.49吨由于泰勒涡旋的波长受到不同几何条件的影响，因此模型A的流场结构在圆柱体的两端都不同。相反，在BD型情况下，具有环形肋的环形通道之间会发生各种形式的Taylor涡旋，并且涡旋从环形肋的边缘以比A型更稳定的方式演化。泰勒涡旋的波长为λ_A λ＝ 30mm，λ_B和λ_D＝ 20mm，λ_C＝ 15mm。流动可视化的实验结果表明，它非常适合基准测试旋转机械的传热，冷却和摩擦学设计。

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