Abstract
The governing equations for the initial phase of cooling tower plume behaviour are solved numerically to illustrate the quantitative effects of atmospheric temperature, moisture content, stability and moisture gradient on visible plume lengths. Some discussion of the atmospheric turbulence dominated phase of plume behaviour is given. Decreasing relative humidity with height and/or stable conditions in the atmosphere are found to lead to decreased plume lengths. The effects are most pronounced at low temperatures and high atmospheric relative humidities. The influence of the entrainment parameter on visible plume length is examined and found to be relatively minor when compared to the influence of atmospheric conditions. The numerical results are compared with a simple graphical solution and the results show considerable disparity.
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