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首页> 外文期刊>Aerosol Science and Technology: The Journal of the American Association for Aerosol Research >Experimental Measurements and Numerical Calculations of Aspiration Efficiency for Cylindrical Thin-Walled Aerosol Samplers in Perfectly Calm Air
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Experimental Measurements and Numerical Calculations of Aspiration Efficiency for Cylindrical Thin-Walled Aerosol Samplers in Perfectly Calm Air

机译：圆柱形薄壁气溶胶采样器在完全平静的空气中的抽吸效率的实验测量和数值计算

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A large experimental study has been conducted to make definitive measurements of the aspiration efficiencies of idealized cylindrical thin-walled aerosol samplers in perfectly calm air,using a method that involved the direct visual observation of falling streams of particles of well-defined size for sampling under specific conditions of sampling flowrate and orientation(downwards facing and horizontal).These data augment an earlier set of experimental data for upwards-facing sampling,and those results are included again in this article for the sake of completeness.In addition to the experimental study,a numerical study was also carried out,first for the purpose of comparison with the experimental results in ranges where such results are available,and second for providing information in ranges where experiments could not be conducted satisfactorily.From this combined approach,a very comprehensive set of new data was generated.In general,the experimental and numerical results were seen to be in very good agreement for the ranges of conditions where data were obtained using both methods.For all cases it was shown in general that aspiration efficiency decreases with increasing Stokes'number(representing inertial forces)but increases with decreasing ratio of particle settling velocity to sampling inlet velocity(representing gravitational forces).From all the data it was seen that the detailed relationship between aspiration efficiency for the various sampler orientations is different for various particle inertia regimes.In the small St_c regime,aspiration efficiency is highest for upwards-facing sampling,with that for downwards-facing and horizontal sampling being about the same.In the intermediate St_c regime,aspiration efficiency for horizontal sampling is greater than for downwards facing,which in turn is greater than for upwards facing.In the large St_c regime,aspiration efficiency for upwards-facing sampling is greater than for horizontal,which in turn is greater than aspiration efficiency for downwards facing.
机译：进行了一项大型实验研究，以对理想的圆柱形薄壁气溶胶采样器在完全平静的空气中的吸气效率进行确定的测量，该方法使用的方法包括直接目视观察粒径下降的颗粒流，以便在以下条件下采样采样流量和方向（向下和水平）的特定条件。这些数据扩充了用于向上采样的较早的实验数据集，为了完整起见，本文将这些结果再次包括在内。 ，还进行了数值研究，首先是为了与可以得到的结果在一定范围内的实验结果进行比较，其次是为了提供不能令人满意地进行实验的范围内的信息。生成了一组新数据。总体上，可以看到实验和数值结果在两种情况下均获得数据的条件范围非常吻合。在所有情况下，通常表明抽吸效率随斯托克斯数（代表惯性力）的增加而降低，但随颗粒沉降速度比的降低而提高从所有数据可以看出，对于不同的颗粒惯性状态，不同采样方向的抽吸效率之间的详细关系是不同的。在较小的St_c模式下，向上抽吸效率最高。面向下采样，向下采样与水平采样大致相同。在中间St_c模式下，水平采样的抽吸效率大于面向下采样的抽吸效率，反之则大于面向上采样的抽吸效率。 ，向上采样的抽吸效率大于水平采样的抽吸效率，反之则更高朝下的抽吸效率。

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