On plume rise – matching Daysmoke with Briggs Equations for industrial stacks

The Briggs Equations for plume rise from industrial and power plant stacks have been extensively validated with stack plume observations. Daysmoke, a plume rise model developed for the simulation of smoke plumes from prescribed burns, was matched with the Briggs Equations for a wide range of plume diameters and for stack-level wind speeds ranging from 2.5 m sec-1 to 10 m sec-1. Daysmoke plumes match Briggs plume centerlines almost perfectly when Daysmoke entrainment coefficients are adjusted for the degree of plume “bentoverness ” and wind speed. The results show that Daysmoke obeys the so-called 2/3 law for plume rise even though the 2/3 law is not explicitly formulated in Daysmoke