Rapid Transition to Turbulence in Pipe Flows Accelerated From Rest
Rapid Transition to Turbulence in Pipe Flows Accelerated From Rest
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管流从静止状态加速转变为湍流状态
DOI：
10.1115/1.1624423
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发表时间：
2003
期刊：
影响因子：
--
通讯作者：
E. Moss
中科院分区：
文献类型：
--
作者：
D. Greenblatt;E. Moss
通过暂时加速流动然后急剧减速到其最终雷诺数，实现了最初处于静止状态的管流向湍流的快速过渡。加速阶段的特点是靠近壁面的层流边界层的增长。随后的快速减速导致壁面附近的弯曲速度分布，随后立即过渡到湍流。过渡所需的时间是显着小于单调加速到相同的雷诺数的管流过渡的时间。转捩本质上不同于振荡管流中观察到的转捩，但在性质上类似于减速到静止的管流
Rapid transition to turbulence in a pipe flow, initially at rest, was achieved by temporally accelerating the flow and then sharply decelerating it to its final Reynolds number. The acceleration phase was characterized by the growth of a laminar boundary layer close to the wall. The subsequent rapid deceleration resulted in inflectional velocity profiles near the wall, followed immediately by transition to turbulence. The time taken to transition was significantly less than the time to transition in a pipe flow monotonically accelerated to the same Reynolds number. Transition is intrinsically different to that observed in oscillatory pipe flows, but is qualitatively similar to pipe flows decelerated to rest