TITLE:
Influence of Fresh Water on Microbubble Generation in an Airlift Column Applied to Aquaculture: Extraction Capacity
AUTHORS:
Djimako Bongo, Nekoulnang Djetounako Clarisse, Edith Kadjangaba, Salif Gaye, Jean-Yves Champagne
KEYWORDS:
Vacuum Airlift Column, MIBC, Casein, Turbidity, Surfactant, Coalescence
JOURNAL NAME:
Open Journal of Applied Sciences,
Vol.12 No.11,
November
15,
2022
ABSTRACT: 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.