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首页> 外文期刊>Journal of the Chinese Society of Mechanical Engineers, Series C: Transactions of the Chinese Society of Mechanical Engineers >Theoretical predictions and experimental measurements of particle deposition on an isothermal vertical cy6linder
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Theoretical predictions and experimental measurements of particle deposition on an isothermal vertical cy6linder

机译：等温垂直圆筒上颗粒沉积的理论预测和实验测量

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摘要

Sub-micron deposition from a laminar free convection boundary layer developing on a heated isothermal vertical cylinder has been analysed. The concentration distribution and the local particle deposition were theoretically calculated under various conditions, using a model based on local similarity solutions with the thermophoretic velocity being proposed by Talbot et al. (1980). The thermophoresis has a pronounced effect on the particle transfer by about two orders of magnitude but only a slight effect on the very smaller particles (0.01μm) and that the effect increases with particle size and distance along the cylinder. Experiments were also conducted using mono-disperse flourescent uranin particles with mean diameters of 0.05μm. A calibrated flourimeter was used to measure the mass of the particles deposited at different axial locations along the cylinder. Absolute values of the deposits were greater than theoretical predictions but the similar trends to the theoretical model were obtained.
机译：分析了在加热的等温垂直圆柱体上形成的层流自由对流边界层的亚微米沉积。使用基于Talbot等人提出的热泳速度的基于局部相似性解决方案的模型，在各种条件下理论计算浓度分布和局部颗粒沉积。 （1980）。热泳对粒子的转移有明显的影响，大约两个数量级，但对很小的粒子（0.01μm）只有很小的影响，并且随着粒子尺寸和沿着圆柱的距离的增加而增加。还使用平均直径为0.05μm的单分散荧光素尿素颗粒进行了实验。使用校准的荧光计测量沿圆柱体在不同轴向位置处沉积的颗粒的质量。矿床的绝对值大于理论预测值，但获得了与理论模型相似的趋势。

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