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• W2945339946 abstract "Measurements of concentration fluctuations in a passive scalar plume released within a turbulent boundary layer are utilised to ascertain the scaling of concentration spectra. It is observed that the concentration spectra in a narrow meandering plume has a self-similar behaviour in both transverse ( $y$ ) and vertical ( $z$ , i.e. wall-normal) directions. Experimental data reveal self-similarity when the magnitude of concentration spectra is scaled by the local concentration variance whereas frequency is suitably scaled utilising the integral length scale of the streamwise velocity or the boundary layer thickness and the source velocity as length and velocity scales, respectively. Furthermore, our data show that at each frequency, the concentration energy is distributed across the $y$ and $z$ directions that is proportional to concentration variance at that location. These results are consistent with our non-dimensional analysis. Based on these observations, if the mean plume statistics are known, a model is proposed with which concentration spectrum at any position within the plume can be calculated using the spectrum at any another location as the input. The model is tested extensively for point-source plumes released at various heights and streamwise distances in a turbulent boundary layer, and is found to predict spectra at different $y$ and $z$ locations in close agreement with measurements." @default.
• W2945339946 created "2019-05-29" @default.
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• W2945339946 date "2019-05-14" @default.
• W2945339946 modified "2023-09-25" @default.
• W2945339946 title "Self-similar spectra of point-source scalar plumes in a turbulent boundary layer" @default.
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• W2945339946 doi "https://doi.org/10.1017/jfm.2019.253" @default.
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