||Video images of smoke dispersion in the near wake of a building, part 1. : temporal and spatial scales of vortex shedding /
Huber, Alan H.
||Environmental Protection Agency, Research Triangle Park, NC. Atmospheric Research and Exposure Assessment Lab.
|| United States Environmental Protection Agency, Office of Research and Development, Atmospheric Sciences Research Laboratory,
Air pollution ;
Flow visualization ;
Wind tunnel models ;
Video signals ;
Experimental data ;
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
||38 pages ; 28 cm
In a wind-tunnel study, recorded video images of smoke dispersion in the wake of a rectangular-shaped building were analyzed. A continuous source of smoke was emitted at floor level, midway along the leeward side of the building. Smoke was observed to build up within a region adjacent to the building. Then the smoke was periodically swept away by vortices shed from the leeward building sides and roof. The applicability of analyzing time series of smoke scattered light for selected quantized video picture elements was favorably demonstrated. Temporal and spatial scales of vortex-shedding of smoke puffs near the center of the wake were quantified through the calculation of spectral densities and autocorrelations. The dominant frequencies (cycles/second) near the center of the wake flow were found to be 0.1-0.3 times the ratio of the velocity to the building height. Estimated integral length scales near the center of the wake flow were found to be 1-2 times the building height.
"Reprint article published in Journal of Wind Engineering and Industrial Aerodynamics, vol. 31, (1988), pp. 189-223." Caption title. "Journal article." Microfiche.