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Sixth International Symposium on Turbulence and Shear Flow Phenomena
June, 22-24, 2009 , Seoul National University, Seoul, Korea

DOI: 10.1615/TSFP6

TRANSPORT FEATURES INSIDE A THERMALLY FORCED CONVECTIVE BOUNDARY LAYER THROUGH 3D PTV AND TEMPERATURE MEASUREMENTS

pages 189-194
DOI: 10.1615/TSFP6.300
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RESUMO

A deeper insight into the dynamics of the convective boundary layer seems to be necessary for environmental purposes, as water or air quality monitoring in the upper oceans and lakes or in the lower troposphere. Transport and mixing features of stratified fluids while free convection occurs, due to the onset of thermal instability, are investigated by means of a laboratory model. Experiments are run in a tank filled with stably stratified distilled water and subjected to heating from below. The equipment is well designed for simultaneously providing temperatures, through thermocouples, and Lagrangian particle trajectories by using a fully three dimensional image analysis technique (3D Particle Tracking Velocimetry). The main goal in the experiment is predicting the spatial extension of the mixing region as a function of initial and boundary conditions. The mixing layer height is detected by employing temperature data and statistics of the velocity field, i.e. the vertical velocity component standard deviation. Finally, a more detailed description of transport and mixing from a nonlocal Lagrangian point of view is obtained through the transilient turbulence approach, resulting in the estimation of the transilient matrix, where each element represents the fraction of fluid moved by turbulence from one layer to another the domain has been previously divided in.

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