Intermittent Release of Smoke from Chimneys

Abstract

Dimensional arguments and the results of recent laboratory experiments are used to show that a considerable increase in the height attained in a calm stable atmosphere could be expected if the effluent were forced out of chimneys at high velocity in discrete puffs, rather than continuously. Numerical values are given for the final height, the size of the chimney and the optimum storage and release times under various conditions. An important application is likely to be to noxious gases which could be removed to a safe height with very little mixing into the atmosphere at lower levels.