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首页> 外文期刊>Journal of Aerosol Science >Experimental measurements of aspiration efficiency for idealized spherical aerosol samplers in calm air
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Experimental measurements of aspiration efficiency for idealized spherical aerosol samplers in calm air

机译：理想的球形气溶胶采样器在平静空气中抽吸效率的实验测量

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In a recent previous paper (Su & Vincent,J.Aerosol Sci.33(2002)103) we described a new method by which to investigate the relationships between aspiration efficiency,particle inertia,gravitational effect and sampling orientation for aerosol sampling in perfectly clam air.All previous experimental work to elucidate the basic nature of aerosol sampling in calm air described has been carried out for thin-walled tubes,and none has yet been reported in relation to blunt samplers.To begin to fill this important gap,the present paper describes the application of our new method towards acquiring new measurements of aspiration efficiency for simple blunt samplers.Experiments were carried out to determine the aspiration efficiencies of simple,idealized,spherical blunt samplers for a range of sampling scenarios,for two sizes of blunt samplers and different sampling inlet diameters,and for upwards and downwards sampling scenarios (and hence a range of governing dimension-less physical quantities).It was shown that aspiration efficiency decreased both with increasing inertia (as represented by the Stokes'number) and with increasing gravitational effect (as represented by the ratio of particle settling velocity to the air at the sampler inlet).The results enabled qualitative physical explanation of the difference between what was observed for upwards and downwards-facing sampling,respectively,in terms of (a) the role of the sampler body in deflecting the air flow in the region close to the body of the sampler (in turn influencing the performance of the sampler),and (b) the interception of particles in the downwards-facing scenario falling within the 'shadow' projected upwards by the sampler body.The significant contribution of this work has been the acquisition of a definitive set of new experimental data.These data will be valuable in the future development of understanding of the physics underlying aerosol sampler performance.Such knowledge will be of practical value because (a) blunt samplers are generally the most representative of the types of instruments used in practical occupational,and (b) calm or slowly moving air is characteristic of many indoor situations.
机译：在最近的一篇论文中（Su＆Vincent，J.Aerosol Sci.33（2002）103），我们描述了一种新方法，用于研究完美蛤中气溶胶采样的抽吸效率，颗粒惯性，引力效应和采样方向之间的关系。以前为阐明所描述的在平静空气中进行气溶胶采样的基本性质而进行的所有实验工作都是针对薄壁管子进行的，尚未有关于钝器采样器的报道。要填补这一重要空白，目前本文介绍了我们的新方法在获取简单钝采样器的抽吸效率新测量值中的应用。进行了实验，确定了两种尺寸的钝采样器在各种采样场景下的简单，理想化，球形钝采样器的抽吸效率。以及不同的采样入口直径，以及用于向上和向下采样的情况（以及因此而决定的一系列无量纲物理量）。结果表明，抽吸效率随惯性的增加（以斯托克斯数表示）和重力效应的增加（以颗粒沉降速度与采样器入口处空气的比值表示）而降低，从而实现了定性的物理解释。 （a）采样器主体在偏转靠近采样器主体的区域中的气流中的作用（进而影响性能）方面，分别观察到向上采样和向下采样之间的差异（b）在向下的情况下，落在采样器主体向上投射的“阴影”内的粒子的拦截。这项工作的重要贡献是获得了一组确定的新实验数据这些数据将对理解气溶胶采样器性能的物理基础的未来发展具有宝贵的价值。这些知识将具有实用价值，因为（a ）钝采样器通常是实际职业中使用的仪器类型的最代表，并且（b）稳定或缓慢移动的空气是许多室内情况的特征。

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