TRAIL part 2: A comprehensive assessment of ice particle fall speed parametrisations

TRAIL part 2: A comprehensive assessment of ice particle fall speed parametrisations
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TRAIL 第 2 部分:冰粒下落速度参数化的综合评估

DOI:
10.1002/qj.3936
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发表时间:
2020
影响因子:
8.9
通讯作者:
McCorquodale M
McCorquodale M
中科院分区:
地球科学3区
文献类型:
--
作者:
McCorquodale M

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研究结果来自一项全面的实验活动,研究3D打印的冰粒类似物的空气动力学。通过使用一种新的实验方法来数字化重建类似物的轨迹和方向,因为它们通过静止的粘性液体下降,使用由一系列数码相机获得的图像,获得类似物的阻力系数的测量。这些数据被用来评估常用的参数化的冰粒下降速度。我们发现,每个参数化的准确性降低在雷诺数大于约,作为与发病的不稳定的振荡,颤振或翻滚运动的类似物下降的影响的结果。我们提出了一个新的下降速度参数化,预测测得的阻力系数在高雷诺数的准确性一致的领先参数化在低雷诺数。
Results are presented from a comprehensive experimental campaign studying the aerodynamics of 3D‐printed analogues of ice particles. Measurements of the drag coefficient of the analogues were acquired by using a novel experimental approach to digitally reconstruct the analogues' trajectory and orientation as they fall through a quiescent viscous liquid, using images acquired by a series of digital cameras. The data are used to evaluate commonly used parametrisations of ice particle fall speeds. We find that the accuracy of each of the parametrisations reduces at Reynolds numbers greater than approximately, as a result of effects associated with the onset of unsteady oscillating, fluttering or tumbling motions as the analogues fall. We propose a new fall speed parametrisation that predicts the measured drag coefficients at high Reynolds number with an accuracy consistent with that of the leading parametrisation at low Reynolds number.
DOI: --
发表时间: 1992
期刊:
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