Upload
valora
View
37
Download
3
Embed Size (px)
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 Presentation
Citation preview
Investigations of turbulence statistics in the laboratory model of an atmospheric cloud
P.M. Korczyk, F. Lusseyran, T.A. Kowalewski, S. P. Malinowski
• „Warm rain initiation problem”
• Lack of high resolution measurements of cloud droplets turbulence interactions.
Motivation
Cloudy, saturated air (blue)Clear, unsaturated air (white)Evaporating droplets
Motivation
cloud chamber
light sheet
laser
camera
cloud during mixing
Small chamber with droplet generator
Experimental setup
Particle Image Velocimetry
Particle Image Velocimetry
Sample from first image
Interrogation area
Correlation matrix
Particle Image Velocimetry
First Image
Second Image
First Image
Deformed first Image
Velocity field
Velocity field
PIV processing
Deformation
Particle Image Velocimetry
Particle Image Velocimetry
Long sequence PIV
Stereo PIV
Stereo PIV
VidPIV ILA
Stereo PIV – comparison of VidPIV and Opflow
Statistics of fluctuations
Second order longitudinal strucure function
Energy dissipation rate
Kolmogorov length