Mixing In A Gas/liquid Flow
Countercurrent Bubble Column
Author(s)
T. A. Bartrand, B. Farouk & C. N. Haas
Abstract
This paper presents results of experimental and numerical investigations into the
hydrodynamics of a bench scale bubble column reactor. Countercurrent bubble
column reactors are the reactors most commonly used in water treatment for
effecting the mass transfer of ozone to the aqueous phase. The experimental
reactor is a glass cylinder with an internal diameter of 17 cm and height of 1.8 m.
Gas is introduced at the bottom of the column via a 2.5 cm spherical diffuser and
water is introduced to the top of the column through a manifold packed with
glass spheres. Residence time distribution (RTD) studies were conducted for a
range of gas flow rates chosen to span the dispersed flow bubble regime. A
computational fluid dynamics computer code was used to model flow in the
bubble column. Numerical studies were performed to refine and validate the
CFD model and to gain insights into the fluid dynamics of countercurrent flow
bubble columns. Investigations identified a gas flow rate within the ideal bubbly
flow regime at which large-scale hydrodynamics and phase distribution were
significantly different from those encountered at lower gas flow rates. These
results will be used in subsequent studies in which ozone mass transfer and
chemistry are included.
Keywords: countercurrent, bubble column, dispersion, CFD.
1 Introduction
In water and wastewater treatment, bubble contactors are used frequently for
dissolution of gaseous ozone into the aqueous phase because of their simple
design, low energy requirements (excluding the energy required in ozone
generation) and familiarity to the industry and regulatory agencies (Langlais et
al. [1]). Full-scale contactors typically employ baffled chambers in which
Keywords
countercurrent, bubble column, dispersion, CFD.
Related Book
Other papers in this volume
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