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Using 3D-printed analogues to investigate the fall speeds and orientations of complex ice particles

Westbrook, C. D. and Sephton, E. K. (2017) Using 3D-printed analogues to investigate the fall speeds and orientations of complex ice particles. Geophysical Research Letters, 44 (15). pp. 7994-8001. ISSN 0094-8276

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To link to this item DOI: 10.1002/2017gl074130

Abstract/Summary

The terminal velocity vt and preferred orientations of ice particles has been investigated using 3D-printed analogues sedimenting in glycerine solutions at Reynolds numbers typical of natural ice particles falling in air. Twenty two different particle geometries were investigated: these included both simple shapes, such as hexagonal plates, as well as more complex particles, such as bullet rosettes, plate-polycrystals and aggregates. Two widely-used prescriptions for ice particle fall speed were tested against the new experimental data, to determine the accuracy of their predictions. We show that for open particles, such as bullet rosettes and aggregates, one of these prescriptions systematically overestimates vt, by as much as 80%.

Item Type:Article
Refereed:Yes
Divisions:Faculty of Science > School of Mathematical, Physical and Computational Sciences > Department of Meteorology
ID Code:71730
Publisher:American Geophysical Union

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