Air-water bubbly flows : theory and applications

Chanson, Hubert (1999). Air-water bubbly flows : theory and applications Professional Doctorate, School of Engineering, The University of Queensland.

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Author Chanson, Hubert
Thesis Title Air-water bubbly flows : theory and applications
School, Centre or Institute School of Engineering
Institution The University of Queensland
Publication date 1999-12-01
Thesis type Professional Doctorate
Supervisor Prof C.J. Apelt
Total pages 1 v.
Language eng
Subjects 291205 Ocean Engineering
290501 Mechanical Engineering
291101 Environmental Engineering Modelling
291801 Fluidization and Fluid Mechanics
291103 Environmental Engineering Design
290000 Engineering and Technology
Formatted abstract

In turbulent water flows, large quantities of air bubbles are entrained at the free-surfaces. Practical applications of gas-liquid bubbly flows are found in Chemical, Civil, Environmental, Mechanical, Mining and Nuclear Engineering. Air-water flows are observed in small-scale as well as large-scale flow situations. Typical examples include thin circular jets used as mixing devices in chemical plants (Qw ~ 0.001 L/s, diameter ~ 1 mm) and spillway flows (Qw > 10,000 m3/s, flow thickness over 10 m). In each case, however, the interactions between the entrained air bubbles and the turbulence field are significant.

The present manuscript regroups a collection of one book and 43 articles on the study of air bubble entrainment in turbulent flows. The work aims to gain a better understanding of the basic mechanisms of gas entrainment and the interactions between entrained gas bubbles and the turbulence. It has been the purpose of the research work to assess critically the overall state of this field, to present new analysis and experimental results, to compare these with existing data, and to present new compelling conclusions regarding momentum and void fraction development of air-water gas-liquid bubbly flows.

The manuscript presents a comprehensive analysis of the air entrainment processes in free-surface turbulent flows. The air-water flows are investigated as homogeneous mixtures with variable density. The variations of fluid density result from the non-uniform air bubble distributions and the turbulent diffusion process. Several types of air-water free-surface flows are studied : plunging jet flows, open channel flows, and turbulent water jets discharging into air.

Keyword Water -- Air entrainment
Turbulence
Fluid mechanics
Air-water flows
gas-liquid multiphase flows

 
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