Impact of the microstructure of precipitation and hydrometeors on ...
the Wind Tunnel Laboratory - ipa.uni-mainz.de · Particle Chemistry Department Miklós Szakáll,...
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Particle Chemistry Department Miklós Szakáll, Karoline Diehl, Subir K. Mitra, Stephan Borrmann Atmospheric Hydrometeors in the Wind Tunnel Laboratory Mainz Vertical Wind Tunnel Z-type wind tunnel Drop freezing 800 μm 1.7 mm 5 mm Shapes of raindrops Internal circulation in raindrops 800 μm 6 mm Riming of graupel Graupel Collection Box 1 mm Riming of snow flakes Graupel growth freely floating of hydrometeors (drops, ice particles, snow flakes) sizes from 10 μm to 5 cm wind speed up to 40 m/s temperatures from +30°C to -30°C no wall or substrate effects observation of single objects control of parameters (temperature, humidity) Research fields raindrop shapes and oscillations internal circulation of raindrops collision processes riming and retention of trace gases heterogeneous freezing Publications Diehl, K., et al., 2014: Particle-area dependence of mineral dust in the immersion mode: investigations with freely suspended drops in an acoustic levitator. Atmos. Chem. Phys., 14, 12343-12355. v. Blohn, N., et al., 2013: The retention of ammonia and sulfur dioxide during riming of ice particles and snow flakes: Laboratory experiments in the Mainz vertical wind tunnel. J. Atm. Chem., 70, 131-150. Müller, S., et al., 2013: Shapes and oscillations of raindrops with reduced surface tensions: Measurements at the Mainz vertical wind tunnel. Atmos. Res., 119, 38-45. Szakáll, M., et al., 2013: A wind tunnel study of the effects of collision processes on the shape and oscillation for moderate-size raindrops. Atmos. Res., 142, 67-78. v. Blohn, N., et al., 2011: Wind tunnel experiments on the retention of trace gases during riming: Nitric acid, hydrochloric acid, and hydrogen peroxide. Atm. Chem. Phys., 11, 11569-11579. Diehl, K., et al., 2011: The Mainz vertical wind tunnel facility: A review of 25 years of laboratory experiments on cloud physics and chemistry. In: J.D. Pereira (Ed.), Wind tunnels: Aerodynamics, models, and experiments. Nova Science Publishers, Inc. Szakáll, M., et al., 2010: Shapes and oscillations of falling raindrops – A review. Atmos. Res., 97, 416-425. Filament break-up after collision of 2.5 mm raindrop with 500 μm droplet Ice crystals with soot as ice nucleating particles Crystal size 100 to 170 μm Frozen drops with pollen as ice nucleating particles Drop size 100 to 170 μm 2.5 m Oscillation of solution raindrops Oscillation of pure raindrops
Transcript of the Wind Tunnel Laboratory - ipa.uni-mainz.de · Particle Chemistry Department Miklós Szakáll,...
Particle Chemistry Department
Miklós Szakáll, Karoline Diehl, Subir K. Mitra,
Stephan Borrmann
Atmospheric Hydrometeors in
the Wind Tunnel Laboratory
Mainz Vertical Wind Tunnel
Z-type wind tunnel
Dro
p fre
ezin
g
800 µm 1.7 mm
5 mm
Shapes of raindrops
Internal circulation
in raindrops
800 µm
6 mm
Riming of graupel
Graupel Collection Box
1m
m
Riming of
snow flakes
Gra
up
el
gro
wth
freely floating of hydrometeors
(drops, ice particles, snow flakes)
sizes from 10 µm to 5 cm
wind speed up to 40 m/s
temperatures from +30°C to -30°C
no wall or substrate effects
observation of single objects
control of parameters
(temperature, humidity)
Research fields
raindrop shapes and oscillations
internal circulation of raindrops
collision processes
riming and retention of trace gases
heterogeneous freezing
Publications
Diehl, K., et al., 2014: Particle-area dependence of mineral dust in the immersion mode: investigations with
freely suspended drops in an acoustic levitator. Atmos. Chem. Phys., 14, 12343-12355.
v. Blohn, N., et al., 2013: The retention of ammonia and sulfur dioxide during riming of ice particles and
snow flakes: Laboratory experiments in the Mainz vertical wind tunnel. J. Atm. Chem., 70, 131-150.
Müller, S., et al., 2013: Shapes and oscillations of raindrops with reduced surface tensions: Measurements
at the Mainz vertical wind tunnel. Atmos. Res., 119, 38-45.
Szakáll, M., et al., 2013: A wind tunnel study of the effects of collision processes on the shape and
oscillation for moderate-size raindrops. Atmos. Res., 142, 67-78.
v. Blohn, N., et al., 2011: Wind tunnel experiments on the retention of trace gases during riming: Nitric acid,
hydrochloric acid, and hydrogen peroxide. Atm. Chem. Phys., 11, 11569-11579.
Diehl, K., et al., 2011: The Mainz vertical wind tunnel facility: A review of 25 years of laboratory experiments
on cloud physics and chemistry. In: J.D. Pereira (Ed.), Wind tunnels: Aerodynamics, models, and
experiments. Nova Science Publishers, Inc.
Szakáll, M., et al., 2010: Shapes and oscillations of falling raindrops – A review. Atmos. Res., 97, 416-425.
Filament break-up after collision of
2.5 mm raindrop with 500 µm droplet
Ice crystals
with soot
as ice
nucleating
particlesCry
sta
l siz
e 1
00
to
17
0 µ
m
Frozen drops
with pollen as
ice nucleating
particlesDrop size 100 to 170 µm
2.5
m
Oscilla
tio
n o
f
so
luti
on
rain
dro
ps
Oscilla
tion
of
pu
re ra
ind
rop
s
