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Mass Transfer around a Rising CO2 Bubble in an Air Lift Column Applied to Aquaculture

Natural Resources 2020年第5期11卷 205-217页

作者： Djimako Bongo Edith Kadjagaba nekoulnang djetounako clarisse Jean-Yves Champagne National Institute of Science and Technology of Abéché Abéché Chad Faculty of Exact and Applied Sciences University of N’Djamena N’Djamena Chad Laboratory of Fluid Mechanics and Acoustics INSA-Lyon Lyon France

He mentioned in the 18th century the possibility of injecting gas bubbles into a column of liquid to create a displacement of this liquid due to the rise of bubbles. This system takes the name of Air Lift and the first publications around this process appear at the beginning of the 20th century. There are many economic and ecological interests: CO2 from industrial production is valued because it is consumed by algae, which once they reach maturity can be converted into fuel. It is therefore a very good energy balance thanks to a low consumption of gray energy and the system is simple to set up. In this study, we will delve deeper into the description of the bubble column and the theory that accompanies it. We will then describe our experiences and the work done.

关键词： Mass Transfer PLIF PIV Transverse Velocity CO2

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Influence of Fresh Water on Microbubble Generation in an Airlift Column Applied to Aquaculture: Extraction Capacity

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Open Journal of Applied Sciences 2022年第11期12卷 1809-1823页

作者： Djimako Bongo nekoulnang djetounako clarisse Edith Kadjangaba Salif Gaye Jean-Yves Champagne Higher Normal School of Technology of Sarh Sarh Chad Paleontology Department National Research Center for Development of N’djamena N’djamena Chad Faculty of Sciences and Techniques University of Doba Doba Chad LME Materials and Energetics Laboratory University Institute of Technology Thiès Senegal Laboratory of Fluid Mechanics and Acoustics INSA-Lyon Lyon France

Bubble flows consist a liquid phase and a gaseous phase dispersed as bubbles. They occur in nature and in many industrial applications, such as oil transportation in pipelines and steam generators for power generation. Due to large difference in density between gas and liquid, the flottability force causes bubbles to rise, which in turn can generate overall motion and agitation in liquid. This use of gravity as a flow driver, which is specific to disperse phase systems, is used in process engineering (bubble columns and gasosiphon) to sparingly promote mixing and exchange between gas and liquid. In many applications, bubbles are used to agitate a liquid in order to promote mixing and transfers. This work is devoted to study of hydrodynamics of a bubble column. Experimentally, we have determined properties fluctuations of velocities inside the aquarium of rising homogeneous bubbles for different bubble sizes and vacuum rates. The interfacial area between gas and liquid phase is a crucial factor for mass transfer in bubble columns. The molecular exchange between a given volume of gas and water can be enhanced by formation of smaller bubbles, leading to a larger gas-liquid interface. This work presents the various physical phenomena that apply to bubbles, as well as associated dimensionless numbers. A state art of Micro-Bubble Generators (MBG) is then presented, presenting systems using various phenomena such as cavitation, electrolysis, or shear.

关键词： Vacuum Airlift Column MIBC Casein Turbidity Surfactant Coalescence

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