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首页> 外文期刊>American journal of fluid dynamics >Numerical Simulation of the Evolution of Reynolds Number on Laminar Flow in a Rotating Pipe
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Numerical Simulation of the Evolution of Reynolds Number on Laminar Flow in a Rotating Pipe

机译：旋转管层流中雷诺数演化的数值模拟

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Laminar flow in a stationary pipe is destabilized when swirl is introduced due to pipe rotation. This paper employs the practicability of COMSOL Multiphysics, in numerically simulating laminar flow in a straight axially rotating pipe, with a view of examining the influence of varying Reynolds numbers on the flow. The results show that the velocity profiles for low Reynolds numbers are significantly influenced by large rotation rates. The parabolic solution for axial velocity in this case, is approached faster at downstream sections further from the inlet than for higher Reynolds number. With a decrease in shear rate and swirl downstream of the pipe, the tangential velocity component of the flow becomes large at high rotation rates, and the flow approaches a forced vortex type. This becomes apparent further away from the pipe inlet. The overall results suggest that when a fluid is characterized by a Reynolds number in a pipe, the flow behavior is controlled to some large extent by the swirl effect induced by pipe rotation, and this is seen from the description of the velocity components associated with swirl flows.
机译：当由于管道旋转而引入旋涡时，固定管道中的层流不稳定。本文利用COMSOL Multiphysics的实用性，对轴向直管中的层流进行数值模拟，以研究变化的雷诺数对流动的影响。结果表明，低雷诺数的速度曲线受较大转速的影响很大。在这种情况下，轴向速度的抛物线解在离进口更远的下游区域比在更高的雷诺数时更快。随着剪切速率的减小和管道下游的涡流，在高转速下，流体的切向速度分量变大，并且流体接近强制涡流类型。这一点在远离管道入口处变得明显。总体结果表明，当流体以管道中的雷诺数为特征时，流动行为在很大程度上受到管道旋转引起的旋流效应的控制，这从与旋流相关的速度分量的描述中可以看出。流。

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