Author(s): A. L. Dissanayake; M. Rezvani; S. A. Socolofsky; K. A. Bierlein; J. C. Little
Linked Author(s): Scott A. Socolofsky
Keywords: Bubble plumes; Linear-geometry; Double plume model; Stratification; Integral model
Abstract: An integral plume model is developed to simulate the behaviour of bubble plumes generated from linesource geometry that are used in practical applications such as in aerators, chemical plants, for ice prevention in harbours, for destratification in lakes, and as bubble curtains for the prevention of saline water intrusions. The model is an extension of a point source model which was developed to simulate multiphase bubble plumes in stratification. The model considers the hydrodynamics, thermodynamics, and heat transfer of the bubbles. Existing integral bubble plume models adapted to line-source geometry consider the upwelling of the lower level dense ambient water from the bubble plumes. However, they do not account for the detraining of this heavy water from the plume, when they are carried to the upper layers of a stratified environment, where the ambient is less dense than the plume fluid. This is an important phenomenon in the plumes in stratified environments, which should be taken into account to predict the correct intrusion formation, mixing patterns, and efficiency of the bubble plumes. The model developed here uses the double-plume model approach, which accounts for both the entertainment and detrainment of ambient and plume fluid in stratified environments. This paper presents the details of the model development, calibration of a key parameter controlling the detrainment, and a validation simulation. o n
Year: 2016