Drop Axis Ratios from a 2D Video Disdrometer
Drop Axis Ratios from a 2D Video Disdrometer
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DOI：
10.1175/jtech1767.1
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发表时间：
2005-07
影响因子：
2.2
通讯作者：
M. Thurai;V. Bringi
中科院分区：
文献类型：
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作者：
M. Thurai;V. Bringi
摘要报道了用二维视频流速仪（2DVD）测量液滴形状的实验结果。在平静条件下，从位于地面以上80米的桥上的软管产生液滴，该高度足以使液滴振荡达到稳定状态。必须仔细处理滴度计数据，以消除仪器不匹配的液滴，并消除系统扩散函数。分析的液滴总数约为115 000。它们的轴比分布，直径范围从1.5到9 mm。平均轴比随液滴直径的增加而减小，与Beard和Chuang平衡形状模型的上限一致。推断的振荡模式似乎是占主导地位的扁圆长轴对称模式的直径范围为1.5至9毫米。平均轴比同意与两个经验拟合的公式在早期的研究报告。此外，还对雷达数据进行了线性拟合。
Abstract Results from an experiment to measure the drop shapes using a 2D video disdrometer (2DVD) are reported. Under calm conditions, drops were generated from a hose located on a bridge 80 m above ground, this height being sufficient to allow drop oscillations to reach a steady state. The disdrometer data had to be carefully processed so as to eliminate the drops mismatched by the instrument and to remove the system spreading function. The total number of drops analyzed was around 115 000. Their axis ratio distributions were obtained for diameters ranging from 1.5 to 9 mm. The mean axis ratio decreases with increasing drop diameter, in agreement with the upper bound of the Beard and Chuang equilibrium shape model. The inferred mode of oscillation appears to be dominated by the oblate–prolate axisymmetric mode for the diameter range of 1.5 to 9 mm. The mean axis ratio agrees well with two empirically fitted formulas reported in earlier studies. In addition, a linear fit was applied to the data for radar...