investigations of tu rbulence statistics in the laboratory model of an atmospheric cloud
DESCRIPTION
Investigations of tu rbulence statistics in the laboratory model of an atmospheric cloud. P.M. Korczyk, F. Lusseyran, T.A. Kowalewski, S. P. Malinowski. Motivation. „ W arm rain initiation problem” Lack of high resolution measurements of cloud droplets turbulence interactions. Motivation. - PowerPoint PPT PresentationTRANSCRIPT
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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