Computational flow modelling and design of bubble column reactors

https://hal.archives-ouvertes.fr/hal-01394969/document

Measuring techniques in gas–liquid and gas–liquid–solid reactors

http://fs.teledos.gr:2206/%3ERESEARCH%20PUBLICATIONS/CHEMICAL%20ENGINEERING/Reactor/Multiphase%20reactors%20-%20revisited.pdf

Multiphase reactors – revisited

This experimental study is aimed at investigating the effect of liquid phase properties and gas distribution on bubble and hydrodynamic characteristics in bubble columns. With the various measuring techniques used, systematic measurements of bubble size, velocity and frequency and gas hold-up are possible. Bubble size distribution and shape factors which are rarely found in literature, are also available. Water–alcohol solutions are used to simulate the behaviour of industrial non-coalescing organic mixtures. The experimental results obtained with three different spargers in the coalescence inhibiting solutions are compared with data on standard coalescing air–water system. Evolutions of bubble characteristics and gas hold-up have been interpreted successfully by considering the simultaneous influence of the hydrodynamic regime of the gas–liquid flow and of the operating regime of the distributor. It has also been put into evidence that bubble frequency measurements are good tools to evaluate distributor efficiency. The influence of the distributor has been shown to be enhanced in non-coalescing media. Bubble shape and bubble size distributions are dramatically modified by addition of minute quantities of alcohol in water. Bimodal distributions can be observed even in the homogeneous regime with orifice nozzle spargers.

Influence of coalescence behaviour of the liquid and of gas sparging on hydrodynamics and bubble characteristics in a bubble column

Improved tools for bubble column reactor design and scale-up☆

Numerous experimental results concerning the flow structure in bubble columns are presented, including axial and radial components of the bubble velocity, axial components of the liquid velocity and its fluctuations as well as the radial distribution of the gas hold-up. The experiments were conducted in a column of inner diameter 0.29 m and height 4.5 m. The gas distributor was designed in such a manner that uniform distributions of gas and liquid could be achieved in the column. Gas entered through a series of holes of diameter 0.2 mm and merged with liquid which was fed through uniformly distributed holes of diameter 30 mm.

Bubble behaviour and flow structure of bubble columns

A heterogeneous fluid dynamic model has been developed to describe the complex flow structure of two-phase flow in bubble columns. The equation of continuity and the momentum balances are the basis of the model. The coupling of the two phases is performed by a force of interaction which is deduced by a force balance around a single rising bubble. Multiphase flow mixing processes are taken into consideration by introducing the turbulent viscosities of the two phases involved. The model equations were implemented successfully by applying a tridiagonal matrix algorithm.

Hydrodynamics in bubble columns

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Bubble behaviour and flow structure of bubble columns

Hydrodynamics in bubble columns