Graduate Thesis Or Dissertation
 

Photographic analysis of buoyant stack plumes in a laboratory model of the turbulent mixed layer

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  • Four buoyant plumes were produced within a laboratory convectively mixed layer from a source height of about z[subscript s] = 0.15 h, where h is the height of the convectively mixed layer. The projected images of these plumes in the X-Z plane were analyzed using a densitometer (photomultiplier tube) to calculate dimensionless crosswind integrated concentration values. These values were examined at regular intervals of non-dimensionalized heights and downwind distances to calculate center-of-mass heights, approximate plume limits, and touchdown distances. The plume buoyancy values were expressed in dimensionless terms as the parameter F[subscript *]. The touchdown distances are greatest and the surface integrated crosswind concentrations are smallest for the three most buoyant plumes. The highest center-of-mass and plume limit positions are also associated with the most buoyant plumes. The surface crosswind integrated concentration values for even the least buoyant plumes are much smaller than for non-buoyant plumes from previous studies. Touchdown distances for buoyant plumes from this data set agree with data from Willis and Deardorff (1983); however, the centerline and lower plume limits are at greater heights for this study. Vertical profiles of crosswind integrated concentration values indicate that the least buoyant plume has a bimodal distribution near the stack then becomes uniform at greater distances. The vertical profiles for the three most buoyant plumes show the highest concentration values are present in the upper part of the mixed layer at most downwind distances examined in this study. This distribution of effluent is also indicated by the vertical center-of- mass heights being larger than the plume centerline calculated from the average of the lower and upper plume limits.
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  • File scanned at 300 ppi (Monochrome, 24-bit Color) using ScandAll PRO 1.8.1 on a Fi-6670 in PDF format. CVista PdfCompressor 4.0 was used for pdf compression and textual OCR.
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