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Investigations of tu rbulence statistics in the laboratory model of an atmospheric cloud

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.

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Investigations of tu rbulence statistics in the laboratory model of an atmospheric cloud

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  1. Investigations of turbulence statistics in the laboratory model of an atmospheric cloud P.M. Korczyk, F. Lusseyran, T.A. Kowalewski, S. P. Malinowski

  2. Motivation • „Warm rain initiation problem” • Lack of high resolution measurements of cloud droplets turbulence interactions.

  3. Motivation Cloudy, saturated air (blue) Clear, unsaturated air (white) Evaporating droplets

  4. Small chamber with droplet generator cloud chamber light sheet laser cloud during mixing camera Experimental setup

  5. Particle Image Velocimetry

  6. Particle Image Velocimetry

  7. Particle Image Velocimetry Sample from first image Correlation matrix Interrogation area

  8. Particle Image Velocimetry PIV processing First Image Velocity field Second Image First Image Deformation Deformed first Image Velocity field

  9. Particle Image Velocimetry

  10. Long sequence PIV

  11. Stereo PIV

  12. Stereo PIV VidPIV ILA

  13. Stereo PIV – comparison of VidPIV and Opflow

  14. Statistics of fluctuations

  15. Second order longitudinal strucure function

  16. Energy dissipation rate

  17. Kolmogorov length

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