Raindrop fall velocity in turbulent flow: an observational study

Raindrop fall velocity in turbulent flow: an observational study

Laboratory measurements of drop fall speeds by Gunn–Kinzer under still air conditions with pressure corrections of Beard are accepted as the “gold standard”. We present measured fall speeds of 2 and 3 mm raindrops falling in turbulent flow with 2D-video disdrometer (2DVD) and simultaneous measuremen...

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Bibliographic Details
Published in:Advances in science and research Vol. 18; pp. 33 - 39
Main Authors: Thurai, Merhala, Bringi, Viswanathan, Gatlin, Patrick, Wingo, Mathew
Format: Journal Article
Language:English
Published: Katlenburg-Lindau Copernicus GmbH 21-04-2021
Copernicus Publications
Subjects:
Aerodynamics
Comparative analysis
Fluctuations
Fluid dynamics
Observational studies
Rain
Raindrop velocity
Raindrops
Reynolds number
Sensors
Terminal velocity
Turbulence
Turbulent flow
Two dimensional flow
Velocity
Wind speed
Wind velocities
Wind velocity fluctuations
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Summary:Laboratory measurements of drop fall speeds by Gunn–Kinzer under still air conditions with pressure corrections of Beard are accepted as the “gold standard”. We present measured fall speeds of 2 and 3 mm raindrops falling in turbulent flow with 2D-video disdrometer (2DVD) and simultaneous measurements of wind velocity fluctuations using a 3D-sonic anemometer. The findings based on six rain events are, (i) the mean fall speed decreases (from the Gunn–Kinzer terminal velocity) with increasing turbulent intensity, and (ii) the standard deviation increases with increase in the rms of the air velocity fluctuations. These findings are compared with other observations reported in the literature.
ISSN:1992-0636
1992-0628
1992-0636
DOI:10.5194/asr-18-33-2021