Special Issue "Bubble Column Fluid Dynamics"
A special issue of ChemEngineering (ISSN 2305-7084).
Deadline for manuscript submissions: 20 September 2018
Dr. Giorgio Besagni
Politecnico di Milano, Department of Energy, Via Lambruschini 4a, 20156 Milano, Italy
Website | E-Mail
Interests: innovative renewable energy-based technologies; CFD and lumped parameter modelling of energy system components; modelling of refrigeration systems; experimental and numerical investigations of multiphase flows; energy poverty
Dr. Thomas Ziegenhein
Helmholtz-Zentrum Dresden-Rossendorf e. V. Institute of Fluid Dynamics, 01314 Dresden, Germany
Interests: bubbly flow; multi-phase turbulence; PIV; PTV; CFD
Bubble columns are widely used multiphase reactors where a gas phase is dispersed into a continuous phase. The simplest configuration consists in a vertical cylinder, in which the gas enters through a gas sparger located at the bottom, and the liquid phase is supplied in the batch mode or it may be led in either co-currently or counter-currently to the upward gas stream. Despite the simple column arrangement, bubble columns are characterized by extremely complex fluid dynamic interactions between the phases. For these reasons, their correct design, operation and scale-up rely on the knowledge of the fluid dynamics at “bubble-scale” and at the “reactor-scale”.
An understanding of the fluid dynamics and the transport phenomena in bubble columns (in the homogeneous and heterogeneous flow regimes) is of fundamental importance to support the design and scale-up methods. In this respect, multiphase Computational Fluid-Dynamics (CFD) simulations are particularly useful to study the fluid dynamics in large-scale reactors. Reliable predictions of the homogeneous flow regime with this approach are, however, limited up to now. One important drawback concern the closure models for the interphase forces, turbulence and coalescence and break-up. One difficulty for the model development and validation results from the fact that we still have a lack of knowledge on local phenomena which determine the two-phase flow characteristics and which should be considered in the closure models. To this end, experimental data with high resolution in space and time are requested.
The Special Issue aims to collect contributions of the state-of-the-art on the multi-scale fluid dynamics of bubble columns. The main focus of the volume is on bubble column fluid dynamics without and with mass transfer by using theoretical, experimental, and numerical modeling approaches. Contributions concerning (a) bubble size and shapes and (b) flow regime transition prediction and modeling are strongly encouraged.
Dr. Giorgio Besagni
Dr. Thomas Ziegenhein
Manuscript Submission Information
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- bubble columns
- flow regime
- Gas holdup
- bubble size and shape
The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.
Title: Gas-liquid mass transfer measurements of rising toroidal bubbles in quiescent liquids
Authors: Nicolas Dietrich a,b,c, Mélanie Jimenez a,b,c and Gilles Hébrard a,b,c
a Université de Toulouse, INSA, LISBP, 135 Av. de Rangueil, F-31077 Toulouse, France
b INRA UMR792, Ingénierie des Systèmes Biologiques et des Procédés, F-31400 Toulouse, France
c CNRS UMR 5504, Ingénierie des Systèmes Biologiques et des Procédés, F-31400 Toulouse, France
Abstract：Multiphase flows and especially gas-liquid systems play an important role in many natural and industrial processes such as combustion, petroleum refining, chemical engineering and water treatments. Their efficiency is directly linked to their design and requires a profound understanding of mass transfer phenomena. This transfer depends on the bubble shape and has been widely studied in past decades. Impressive developments in the visualization of ﬂuid structure, detailed ﬂow-field measurements, and sophisticated numerical simulations have led to significant progress in the understanding of complex diphasic ﬂows in recent years, however, difficulties are still encountered. While a lot of studies have focused on the visualization of mass transfer by fluorescence quenching by oxygen called PLIFI technique (Planar Laser Induced Fluorescence with Inhibition) around spherical bubble (Francois et al. 2011) and ellipsoidal bubbles (Stohr et al. 2009 & Jimenez et al. 2013) nothing have been performed about toroidal bubbles. This kind of gas structure has been observed by Walters & Davidson (1963) when an important mass of gas in water is injected in a small time producing a rising ring bubble. In this paper, we investigated experimentally the ascension of ring air bubbles in a quiescent Newtonian liquid. In parallel we carry out mass transfer visualization on two distinct approaches, PLIFI (fluorescence quenching) and an oxygen-sensitive dye colorimetric technique (Fig. 1.a. and b.). Classical probe analyses for kL measurements have been performed in order to compare the quantification of mass transfer and also Particle Image Velocimetry (PIV, fig 1.c) measurements to characterize the hydrodynamics structure.