Abstract
An optical method has been developed for measurement of concentration fluctuations at a point within systems undergoing turbulent mixing. Intensity, two-point correlation and spectral density of mean-square concentration fluctuation have been measured in a jet of smoky air discharged into ambient air. The data agree well with comparable measurements of temperature fluctuations reported by investigators who have used the hot-wire anemometer. Theoretical consideration is given to some unique problems associated with resolution of the new turbulence measuring device.
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