MODELING OF A PASSIVE SCALAR IN A TURBULENT FREE JET UNDER THE CORIOLIS EFFECT

Document Type : Original Article

Author

Department of structures and materials, Air Royal School, Marrakech (Morocco).

Abstract

ABSTRACT
The influence of Coriolis forces is studied in stationary and Sc = 1 (Schmidt number)
cases on the tran sport of a passive scalar in a three-dimensional inhomogeneous
turbulent free jet. The mean velocity field defines a small parameter U∞ (non-dimensional
wind-speed). This parameter governs the asymptotic expansion of the analysis.
Using a linear spectral approach, two-point velocity-concentration correlation
equations are obtained under some realistic simplifying assumptions. The solution
depends on the non-uniform mean concentration gradient. Taking into account swirl
characteristics, an expansion of the solution is constructed by means of analytical
tools, including the effects of several fundamental physical parameters. The mean
concentration gradient field possesses a privileged direction. As application of the
model, the spectral components of the solution are determined using further
simplifying approximations. Graphical surfaces are drawn: these surfaces show the
specific characteristics of mixing in turbulent jets. The results are matched with other
results obtained by means of numerical methods and experimental results.

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