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首页> 外文期刊>Numerical Heat Transfer, Part B. Fundamentals: An International Journal of Computation and Methodology >Breakdown of laminar pipe flow into transitional intermittency and subsequent attainment of fully developed intermittent or turbulent flow
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Breakdown of laminar pipe flow into transitional intermittency and subsequent attainment of fully developed intermittent or turbulent flow

机译：层流分解为过渡间歇并随后获得充分发展的间歇或湍流

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摘要

The breakdown of laminar pipe flow into transitional intermittency is predicted numerically here for the first time. Subsequent to transitional intermittency, a fully developed regime is achieved wherein the flow may be either intermittent or fully turbulent. Fully developed friction factors are predicted as a function of the Reynolds number throughout the intermittent regime. These predictions successfully bridge the gap between well-established laminar friction factors and turbulent friction factors. Definitive numerical information is provided about the locations in the pipe at which both laminar breakdown and fully developed attainment occur. These locations are a function of the Reynolds number. The streamwise changes in the velocity profiles reflect the complex evolution of the flow as it passes through the successive regimes. For design purposes, information is provided for the pressure drop that characterizes the evolving flow. The numerical results correspond to an inlet turbulence intensity level of 5%.
机译：此处首次数值预测了层流向过渡间歇的破裂。在过渡间歇之后，实现了充分发展的状态，其中流动可以是间歇性的或完全湍流的。在整个间歇过程中，充分发展的摩擦因数被预测为雷诺数的函数。这些预测成功地弥补了既定的层流摩擦系数和湍流摩擦系数之间的差距。提供了有关管道中发生层状破裂和充分达到的位置的确切数值信息。这些位置是雷诺数的函数。速度剖面中的沿流方向的变化反映了流经连续状态时的复杂演变。为了设计目的，提供了有关压降的信息，以表征不断变化的流量。数值结果对应于5％的入口湍流强度水平。

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