Investigations of tu rbulence statistics in the laboratory model of an atmospheric cloud
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Investigations of turbulence statistics in the laboratory model of an atmospheric cloud
P.M. Korczyk, F. Lusseyran, T.A. Kowalewski, S. P. Malinowski
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• „Warm rain initiation problem”
• Lack of high resolution measurements of cloud droplets turbulence interactions.
Motivation
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Cloudy, saturated air (blue)Clear, unsaturated air (white)Evaporating droplets
Motivation
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cloud chamber
light sheet
laser
camera
cloud during mixing
Small chamber with droplet generator
Experimental setup
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Particle Image Velocimetry
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Particle Image Velocimetry
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Sample from first image
Interrogation area
Correlation matrix
Particle Image Velocimetry
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First Image
Second Image
First Image
Deformed first Image
Velocity field
Velocity field
PIV processing
Deformation
Particle Image Velocimetry
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Particle Image Velocimetry
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Long sequence PIV
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Stereo PIV
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Stereo PIV
VidPIV ILA
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Stereo PIV – comparison of VidPIV and Opflow
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Statistics of fluctuations
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Second order longitudinal strucure function
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Energy dissipation rate
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Kolmogorov length