Articles | Volume 18
21 Apr 2021
 | 21 Apr 2021

Raindrop fall velocity in turbulent flow: an observational study

Merhala Thurai, Viswanathan Bringi, Patrick Gatlin, and Mathew Wingo

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Cited articles

Atlas, D., Srivastava, R. C., and Sekhon, R. S.: Doppler radar characteristics of precipitation at vertical incidence, Rev. Geophys. Space Phys., 2, 1–35, 1973. 
Beard, K. V.: Terminal velocity and shape of cloud and precipitation drops aloft, J. Atmos. Sci., 33, 851–864,<0851:TVASOC>2.0.CO;2, 1976. 
Bringi, V. N., Thurai, M., and Baumgardner, D.: Raindrop fall velocities from an optical array probe and 2-D video disdrometer, Atmos. Meas. Tech., 11, 1377–1384,, 2018. 
Fitch, K. E., Hang, C., Talaei, A., and Garrett, T. J.: Arctic observations and numerical simulations of surface wind effects on Multi-Angle Snowflake Camera measurements, Atmos. Meas. Tech., 14, 1127–1142,, 2021. 
Fornari, W., Picano, F., Sardina, G., and Brandt, L.: Reduced particle settling speed in turbulence, J. Fluid Mech., 808, 153–167,, 2016. 
Short summary
Fall velocities of rain drops are reported for 2–3 mm drop diameters for several different turbulent intensities. The fall velocities are measured by 2D video disdrometers and the turbulence intensities by 100 Hz sonic anemometer. The findings are, (i) the mean fall speed decreases with increasing turbulent intensity, and (ii) the standard deviation increases with increase in the rms of the air velocity fluctuations.