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. / Graduation date: 1985
| Identifer | oai:union.ndltd.org:ORGSU/oai:ir.library.oregonstate.edu:1957/29131 |
| Date | 30 August 1984 |
| Creators | Hukari, Neil F. |
| Contributors | Deardorff, James |
| Source Sets | Oregon State University |
| Language | en_US |
| Detected Language | English |
| Type | Thesis/Dissertation |
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