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Published October 1986 | public
Journal Article

Instantaneous concentration fluctuations in point-source plumes


A model for the variance σ꜀² of instantaneous plume concentrations, at a level corresponding to that of the Gaussian formulas for the mean field, is developed and tested against available data. Starting from the Eulerian species transport equation, theoretical and empirical information is used to estimate parameters and simplify the form of the transport equation for σ꜀² in a meandering frame of reference. Then, introduction of a localized production of fluctuations (LPF) scheme allows construction of analytical expressions for σ꜀² that provide a direct means for calculating the concentration variance inside the instantaneous boundaries of plumes resulting from continuous point emissions in turbulent flows with uniform mean velocity.

Additional Information

© 1986 American Institute of Chemical Engineers. The authors are indebted to J.C. Hill for his helpful comments on a first version of the manuscript. This work was supported by State of California Air Resources Board agreement A0-044-43. Additional support was provided by grants from the Union Oil Company of California and the Atlantic Richfield Company.

Additional details

August 22, 2023
October 18, 2023