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Experimental study of turbulent mixing of the cloud with unsaturated air under different humidity
Pages: 26-31+44
Year: Issue:  5
Journal: Experiments and Measurements in Fluid Mechanics

Keyword:  cloud-unsaturated air mixingPIVsmall-scale turbulenceprobability density func-tionsecond-order structure function;
Abstract: This paper presents PIV results of turbulent mixing of the cloud and unsaturated air with different environmental humidity in a small cloud chamber(80×80×100cm3).Turbulence characteristics such as the variation,skewness and flatness factors of two-dimensional velocities are first calculated to demonstrate the anisotropy of such turbulent fields of several centimeters scale.Experimental results further show that the departure of the probability density function(PDF)of the vertical velocity component from the standard Gaussian distribution becomes more obvious at the tails with the increase of unsaturated environmental humidity.The anisotropy of the turbulence is further revealed by the difference between the second-order structure functions of two velocity components.The isotropic ratio(the ratio of transverse structure functions to longitudinal structure functions)is far different from the theoretical value for homogeneous and isotropic turbulence and its dependence on the environmental humidity is complicated and needs further investigation.
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