Dispersion models release geometry

Release Geometry. An ideal release for Gaussian dispersion models would be from a fixed point source. Real releases are more likely to occur as a line source (from an escaping jet of material), or as an area source (from a boiling pool of liquid). 

Because of many variations in conditions such as cold products versus hot products, weather and wind conditions, various leak geometries, instantaneous releases, massive tank failures, continuous versus intermittent releases, and pipeline leaks versus raUear punetures, there is no universal model to make accurate quantitative predictions of dispersion of ammonia (Pederson and Selig, 1989 Kaiser and Walker, 1978). All models have described the behavior of ammonia on sudden release from pressurized tank as follows ... 

Whenever the drug is dispersed in the polymer at low eoncentrations, drug release from a slab geometry may be described using the Higuchi model (a.85-a.87). Thus ... 

Several authors have modelled the release rates of therapeutic agents from monolithic dispersions of cylindrical and spherical geometries. These approaches have been summarised by Baker (a.89). 

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