Dilution of Stack Gases in Cross Winds
U.S. Atomic Energy Commission, Technical Information Division, 1950 - Diffusion - 15 pages
Experiments with small stacks discharging into gentle cross winds showed that the cone of stack gas is bent toward the path of the wind and eventually travels along with the wind, further rise of the gas due to its original stack velocity being negligible compared with vertical eddy diffusion of the cloud.
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2-inch diameter stack 2-inch stack 40 inches 48 inches downstream AEROVENT FAN air stream air-ammonia mixture ammonia average concentration becomes horizontal becomes substantially horizontal CALC Q cent of original center line concentration centration Chem chloride smoke plumes cloud becomes substantially concen concentration at CH cone D. H. Johnson dilution of gases discharge velocities discharging into cross discharging into gentle distance downstream DOWNSTREAM FROM STACK downwash eddy diffusion equation experimental fraction of stack ft-sec gas concentration gentle cross winds HEIGHT ABOVE STACK horizontal cloud horizontal point NUMBER Figure 9 ORIGINAL STACK CONCENTRATION photographs points downstream Reynold’s number Sampling tubes smoke plumes issuing stack and points stack diameter stack gas stack gases stack in feet stack velocity stacks discharging T. K. Sherwood Towle tration at ground turbulent values of Vw-Vs various points velocity of stack volume fraction wake of smokestacks wind tunnel wind velocity