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• W2799528090 abstract "Simultaneous measurements of streamwise velocity ( $tilde{U}$ ) and concentration ( $tilde{C}$ ) for a horizontal plume released at eight different vertical locations within a turbulent boundary layer are discussed in this paper. These are supplemented by limited simultaneous three-component velocity and concentration measurements. Results of the integral time scale ( $unicode[STIX]{x1D70F}_{c}$ ) of concentration fluctuations across the width of the plume are presented here for the first time. It is found that $unicode[STIX]{x1D70F}_{c}$ has two distinct peaks: one closer to the plume centreline and the other at a vertical distance of plume half-width above the centreline. The time-averaged streamwise concentration flux is found to be positive and negative, respectively, below and above the plume centreline. This behaviour is a resultant of wall-normal velocity fluctuations ( $w$ ) and Reynolds shear stress ( $overline{uw}$ ). Confirmation of these observations is found in the results of joint probability density functions of $u$ (streamwise velocity fluctuations) and $tilde{C}$ as well as that of $w$ and $tilde{C}$ . Results of cross-correlation coefficient show that high- and low-momentum regions have a distinctive role in the transport of passive scalar. Above the plume centreline, low-speed structures have a lead over the meandering plume, while high-momentum regions are seen to lag behind the plume below its centreline. Further examination of the phase relationship between time-varying $u$ and $c$ (concentration fluctuations) via cross-spectrum analysis is consistent with this observation. Based on these observations, a phenomenological model is presented for the relative arrangement of a passive scalar plume with respect to large-scale velocity structures in the flow." @default.
• W2799528090 created "2018-05-17" @default.
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• W2799528090 date "2018-05-04" @default.
• W2799528090 modified "2023-09-25" @default.
• W2799528090 title "Local transport of passive scalar released from a point source in a turbulent boundary layer" @default.
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• W2799528090 doi "https://doi.org/10.1017/jfm.2018.280" @default.
• W2799528090 hasPublicationYear "2018" @default.
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