||Video Image Analyses of the Cross-Stream Distribution of Smoke in the Near Wake of a Building.
Huber, A. H.;
Arya, S. P. S.;
||Environmental Protection Agency, Research Triangle Park, NC. Atmospheric Sciences Research Lab. ;North Carolina State Univ. at Raleigh. Dept. of Marine, Earth and Atmospheric Sciences.
Wind tunnel tests
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
||In a wind-tunnel study, recorded video images of the top view of smoke dispersion in the wake of a building were analyzed. A continuous source of smoke was emitted at floor level, midway along the leeward side of the building. The technique and usefulness of analyzing video images of smoke is demonstrated in a study of building effects on smoke dispersion. The presentation discusses how the video image intensity is corrected for background intensity and then normalized to a scale of 0 to 100 percent. Profiles of the normalized image mean intensity are compared with similar profiles for the mean concentration of hydrocarbon tracer. The distributions of intensity of cross-stream profiles are discussed. These distributions were analyzed in time and space. Also, time-averaged cross-stream profiles of mean, standard deviation, and other statistics of image intensity are compared with traditional concentration measurements for symmetric wake flow.
||Prepared in cooperation with North Carolina State Univ. at Raleigh. Dept. of Marine, Earth and Atmospheric Sciences.
|PUB Date Free Form
||68A; 68; 51F
||PC A02/MF A01