Study Of Bubbling Fluidization Dynamics Via
Digital Image Analysis Technique
Author(s)
A. Busciglio, G. Micale, L. Rizzuti & G. Vella
Abstract
In the area of chemical engineering, fluidization is a widely employed
technology for a number of industrially important processes. A sound
understanding of the mechanisms governing the complex flow phenomena
involved in a fluidized bed still remains an open technical and scientific issue.
The principal difficulty in analysing fluidization quality and bubble dynamic
is concerned with the possibility of measuring or predicting the physical and
geometrical properties of gas bubbles chaotically rising in a solid granular
medium.
In recent years the use of Computational Fluid Dynamics (CFD) has been
significantly increasing to simulate multi-phase flows. It is invariably
emphasized that a necessary step towards the development of reliable fully
predictive CFD models is an extensive experimental validation of the simulation
results.
On the above basis, the present work focuses on the statistical analysis of the
behaviour of a 2-D fluidized bed operating under bubbling and slugging
conditions. Experimental data are collected by the means of a purposely
developed Digital Image Analysis Technique (DIAT). DIAT is capable of
measuring several bubbles properties simultaneously. Moreover it could be used
without any modification for computational data analysis, thus providing the
answer to the need for close comparison between experimental and
computational data. In fact, in many cases, direct experimental validation of
CFD simulation is difficult and cumbersome, since different level of detail is
available in experimental and computational investigations. In this work, the
development of an image analysis technique available for both experimental and
computational data does allow direct and effective quantitative comparison.
Keywords: multiphase flow, CFD, image analysis.
Keywords
multiphase flow, CFD, image analysis.
Related Book
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