Physics – Fluid Dynamics
Scientific paper
2008-04-17
Physics
Fluid Dynamics
29 pages, 5 figures
Scientific paper
A phenomenological kinetic energy theory of buoyant multiphase plumes is constructed, being general enough to incorporate the dissolution of the dispersive phase. We consider an axisymmetric plume, and model the dissolution by means of the Ranz-Marshall equation in which there occurs a mass transfer coefficient dependent on the plume properties. Our kinetic energy approach is moreover generalized so as to take into account variable slip velocities. The theoretical model is compared with various experiments, and satisfactory agreement is found. One central ingredient in the model is the turbulent correlation parameter, called I, playing a role analogous to the conventional entrainment coefficient \alpha in the more traditional plume theories. We use experimental data to suggest a relationship between I, the initial gas flux at the source, and the depth of the gas release. This relationship is used to make predictions for five distinct case studies. Comparison with various experimental data shows that the kinetic energy approach built upon use of the parameter I in practice has the order of predictive power as the conventional entrainment-coefficient models. Moreover, an advantage of the present model is that its predictions are very quickly worked out numerically. Finally, we give a sensitivity analysis of the kinetic energy approach. It turns out that the model is relatively stable with respect to most of the input parameters. It is shown that the dissolution is of little influence on the dynamics of the dispersed phase as long as the dissolution is moderate.
Brevik Iver
Einarsrud Kristian Etienne
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