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Pipe flow with large particles and their impact on the transition to turbulence
Physical Review Fluids ( IF 2.5 ) Pub Date : 2020-11-16 , DOI: 10.1103/physrevfluids.5.112301
Martin Leskovec , Fredrik Lundell , Fredrik Innings

The classical transition from laminar to turbulent flow is affected if solid particles are added. The transition behavior is a function of particle size d and solid volume fraction ϕ and the flow undergoes a smooth transition, as opposed to intermittent, if ϕ exceeds a certain threshold. In this work we show that, for particle-laden pipe flows with large particle-to-pipe diameter ratios d/D, the ϕ threshold for altering the transition is much lower than previously reported for smaller particles. Magnetic resonance velocimetry reveals that particles introduce turbulent-like fluid velocity fluctuations in laminar flow. Factors that might control the limits between “classical” and “smooth” transition in the state space spanned by d/D and ϕ are discussed based on scaling analyses.

中文翻译:

大颗粒的管道流动及其对湍流过渡的影响

如果添加固体颗粒,则会影响从层流到湍流的经典过渡。过渡行为是粒径的函数d 和固体体积分数 ϕ 且与间歇性相反,流动经历了平稳过渡 ϕ超过某个阈值。在这项工作中,我们表明,对于颗粒直径较大的管道​​,颗粒与管道的直径比大d/dϕ改变过渡的阈值比以前报道的较小颗粒低得多。磁共振测速表明,颗粒在层流中引入了湍流状的流体速度波动。可能控制状态空间中“经典”和“平滑”过渡之间的限制的因素d/dϕ 基于定标分析讨论。
更新日期:2020-11-16
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