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首页> 外文期刊>International journal of numerical methods for heat & fluid flow >Nanoparticle-laden gas flow around a circular cylinder at high Reynolds number
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Nanoparticle-laden gas flow around a circular cylinder at high Reynolds number

机译：高雷诺数下的纳米颗粒载气绕圆柱体流动

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Purpose - Experiments to investigate the characteristic distribution of nanoparticle-laden gas flow around a circular cylinder were performed with a fast mobility particle spectrometer. The paper aims to discuss these issues. Design/methodology/approach - The fast mobility particle sizer spectrometer is used to measure quasi-instantaneous particle number density. The acquired particle number density, total concentration, and geometric mean diameter at free stream and in the wake were used to discuss the particle characteristic distribution. The time-averaged velocity field detected by particle imaging velocimetry was used to investigate the effect of carried phase on nanoparticles distribution. Findings - Results show that the total particle concentration in the free stream is larger than that in the wake. However, the geometric mean diameter of particle in the free stream is smaller than that in the wake for different Re. The total particle concentration and geometric mean diameter in the free stream and the wake both change in the same way, but with an obvious lag which increases with Re. Despite particle deposition, the number density of particles with electrical-mobility-equivalent diameters in the range from 220.7 to 523.3 nm in the wake is still higher than that in the free stream. Originality/value - Though the particles-laden gas flow around a circular cylinder had been studied experimentally and numerically before, where particles are larger than one micrometer, investigators paid little attention on the nanoparticles-laden gas flow where particles are smaller than one micrometer, especially at high Reynolds number, because numerical methods so far cannot deal these problems completely and satisfactorily. However, this issue is widely existing in nature and engineering application, such as superfine dust or microorganism captured by a circular cylinder model.
机译：目的-使用快速迁移率粒子光谱仪进行实验以研究载有纳米颗粒的气体在圆柱体周围的流动特性。本文旨在讨论这些问题。设计/方法/方法-快速迁移粒度分析仪用于测量准瞬时粒子数密度。在自由流和尾流时获得的颗粒数密度，总浓度和几何平均直径用于讨论颗粒特征分布。通过粒子成像测速技术检测到的时间平均速度场用于研究载流相对纳米粒子分布的影响。结果-结果显示，自由流中的总颗粒浓度大于尾流中的总浓度。然而，对于不同的Re，自由流中粒子的几何平均直径小于尾流中的。自由流和尾流中的总颗粒浓度和几何平均直径都以相同的方式变化，但是具有明显的滞后性，随Re增大。尽管有颗粒沉积，但尾流中电当量直径范围为220.7至523.3 nm的颗粒数密度仍高于自由流中的数密度。独创性/价值-尽管之前已经通过实验和数值研究了在圆柱周围的载有颗粒的气流，但当颗粒大于1微米时，研究人员对颗粒小于1微米的载有纳米颗粒的气流的关注却很少，特别是在高雷诺数的情况下，因为迄今为止的数值方法不能完全令人满意地解决这些问题。但是，此问题在自然和工程应用中广泛存在，例如圆柱模型捕获的超细粉尘或微生物。

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