Stability and experimental velocity field in Taylor—Couette flow with axial and radial flow
Stability and experimental velocity field in Taylor—Couette flow with axial and radial flow
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DOI：
10.1007/3-540-45549-3_9
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发表时间：
2000
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影响因子：
--
通讯作者：
Richard M. Lueptow
中科院分区：
文献类型：
--
作者：
Richard M. Lueptow
在圆柱形库埃特流上施加径向或轴向流改变了系统的稳定性并修改了速度场。轴向流使圆柱形库埃特流稳定。超临界流包括各种各样的旋涡结构，包括螺旋形和波浪形旋涡。轴向流也导致涡流随轴向流平移。通过多孔圆柱的径向流稳定圆柱库埃特流，无论径向流是向内还是向外。一个例外是，小的径向向外流动会使流动稍微不稳定。径向流动导致涡流中心朝向流体离开环空的圆柱体移位。对于轴向流和径向流的组合，轴向流使圆柱库埃特流稳定，而与径向流无关。此外，与没有径向流的情况相比，径向流使流动稳定。在超临界转变之上，在内筒是多孔的而外筒是无孔的情况下，发生各种各样的流动状态。轴向流和径向流入的圆柱Couette流的速度场在小径向流的情况下改变很小。然而，当流体通过内筒损失时，涡流在环空中平移时尺寸收缩。
The imposition of a radial or axial flow on cylindrical Couette flow alters the stability of the system and modifies the velocity field. An axial flow stabilizes cylindrical Couette flow. The supercritical flow includes a rich variety of vortical structures including helical and wavy vortices. An axial flow also results in translation of the vortices with the axial flow. A radial flow through porous cylinders stabilizes cylindrical Couette flow, whether the radial flow is inward or outward. An exception is that a small radial outward flow destabilizes the flow slightly. The radial flow results in displacing vortex centers toward the cylinder from which fluid exits the annulus. For combined axial and radial flow, the axial flow stabilizes the cylindrical Couette flow regardless of the radial flow. In addition, the radial flow stabilizes the flow compared to the situation with no radial flow. Above the supercritical transition a wide variety of flow regimes occur in the case where the inner cylinder is porous and the outer cylinder is nonporous. The velocity field for cylindrical Couette flow with axial flow and a radial inflow at the inner cylinder is altered very little for small radial flows. However, the vortices shrink in size as they translate in the annulus as fluid is lost through the inner cylinder.