Abstract
Most of the Swedish plume rise observations in 1966 and 1967 were made in neutral or stable conditions. Many of the plumes were found to reach a maximum height at a definite distance downwind after which they levelled off or descended. These heights and distances are plotted nondimensionally using also wind speed, stability and stack gas buoyancy flux. The results agree with a model of “turbulent entrainment” for hot plumes in their first phase (atmospheric turbulence neglected), but the maximum heights observed in slightly stable or windy conditions are smaller than predicted by the model. This is probably due to atmospheric turbulence. Values of the entrainment constant α were 1. (1) evaluated from plume radii on photographs 2. (2) calculated from the plume rises observed. The two averages agree well with each other. Heights and distances to the transition to a second phase were evaluated for all plumes and are found to agree with values expected from the influence of atmospheric turbulence.
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