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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >SCAVENGING OF AEROSOL PARTICLES BY LARGE WATER DROPS .3. WASHOUT COEFFICIENTS, HALF-LIVES, AND RAINFALL DEPTHS
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SCAVENGING OF AEROSOL PARTICLES BY LARGE WATER DROPS .3. WASHOUT COEFFICIENTS, HALF-LIVES, AND RAINFALL DEPTHS

机译：用大水滴清除气溶胶颗粒.3。洗水系数，半衰期和降雨深度

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Using the average values of collection efficiencies obtained from our experiments [Pranesha and Kamra, 1996, this issue] washout coefficients for the drops in the diameter (D) range 3.6 less than or equal to D less than or equal to 5.0 mm collecting micron-sized aerosol particles have been calculated when the drops are neutral, charged, or falling in an electric field. Compared with the neutral case, the values of washout coefficients are higher in both electrical cases, the increase being more pronounced for smaller particles. Washout coefficients show a maximum for a drop charge of 10(-12) to 10(-11) C. With an increase in electric field, the washout coefficients increase linearly for similar to 1-mu m particles, show a maximum for similar to 4-mu m particles, and change insignificantly for similar to 7-mu m particles. Combining our experimental values of collection efficiencies with the theoretical collision efficiencies of McGann and Jennings [1991] for smaller drops, washout coefficients, half-lives, and rainfall depths have been computed for the raindrop size distribution extending from 0.1- to 5 mm-diameter. Results show that raindrops of diameter >1 mm contribute dominantly in removing particles of diameter 1-2 mu m and their contributions increase with the rainfall rate. When the effect of the raindrops of diameter > 1 mm is included, the values of washout coefficient increase by about 2 orders of magnitude for particles of diameter 1-2 mu m and by about 1 order of magnitude for particles of diameter > 2 mu m. It can be concluded from the estimates of rainfall depth that a heavy rainfall over a short duration is more efficient in removing the particles of diameter < 2.2 mu m, whereas a lower rainfall spread longer duration is more efficient in removing the particles of diameter > 2.2 mu m. [References: 14]
机译：使用从我们的实验中获得的收集效率的平均值[Pranesha和Kamra，1996年，本期]，直径（D）范围内的液滴的冲洗系数3.6小于或等于D小于或等于5.0 mm当液滴在电场中呈中性，带电或掉落时，已计算出大小的气溶胶颗粒。与中性情况相比，在两种电气情况下，冲刷系数的值都较高，对于较小的颗粒，其增大更为明显。冲刷系数在10（-12）至10（-11）C的电荷下降时显示出最大值。随着电场的增加，类似于1微米的颗粒，冲刷系数呈线性增加，对于1微米的微粒，冲刷系数显示出最大值。颗粒为4微米，对于类似于7微米的颗粒，变化很小。将我们的收集效率的实验值与McGann和Jennings [1991]的理论碰撞效率相结合，可以计算出直径从0.1到5毫米的雨滴尺寸分布的冲刷系数，半衰期和降雨深度。结果表明，直径> 1 mm的雨滴在去除直径为1-2μm的颗粒方面起主要作用，并且其贡献随着降雨率的增加而增加。当包括直径大于1毫米的雨滴的影响时，冲刷系数的值对于直径1-2微米的颗粒增加大约2个数量级，对于直径大于2微米的颗粒增加大约1个数量级。 。从降雨深度的估计可以得出结论，短时间内的大降雨能更有效地去除直径小于2.2微米的颗粒，而降雨时间越短散布时间越长，去除直径大于2.2微米的颗粒会更有效。亩[参考：14]

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