A study on the behaviour of bubbles of a 2D gas–solid fluidized bed using digital image analysis

Caicedo, Guadalupe Ramos; Marqués, Juan J. Prieto; Ruı́z, Mónica Garcı́a; Soler, Jesús Guardiola

doi:10.1016/s0255-2701(02)00039-9

Cited by 65 publications

(19 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Fig. 9 shows the relation between the mean (time average) and standard deviation of the equivalent bubble diameter (Caicedo et al, 2003) versus the vertical distance from the distributor to the bubble centroid, y, and Fig. 10 depicts the dependence of the mean and standard deviation of bubble velocity on the equivalent bubble diameter.…”

Section: Bubble Diameter and Velocitymentioning

confidence: 99%

Comparison between two-fluid model simulations and particle image analysis & velocimetry (PIV) results for a two-dimensional gas–solid fluidized bed

Hernández-Jiménez

Sánchez-Delgado

Gómez-García

et al. 2011

Chemical Engineering Science

108

View full text Add to dashboard Cite

a b s t r a c tThis work compares simulation and experimental results of the hydrodynamics of a two dimensional, bubbling air fluidized bed. The simulation in this study has been conducted using an Eulerian Eulerian two fluid approach based on two different and well known closure models for the gas particle interaction: the drag models due to Gidaspow and Syamlal & O'Brien. The experimental results have been obtained by means of Digital Image Analysis (DIA) and Particle Image Velocimetry (PIV) techniques applied on a real bubbling fluidized bed of 0.005 m thickness to ensure its two dimensional behaviour. Several results have been obtained in this work from both simulation and experiments and mutually compared. Previous studies in literature devoted to the comparison between two fluid models and experiments are usually focused on bubble behaviour (i.e. bubble velocity and diameter) and dense phase distribution. However, the present work examines and compares not only the bubble hydrodynamics and dense phase probability within the bed, but also the time averaged vertical and horizontal component of the dense phase velocity, the air throughflow and the instantaneous interaction between bubbles and dense phase. Besides, quantitative comparison of the time averaged dense phase probability as well as the velocity profiles at various distances from the distributor has been undertaken in this study by means of the definition of a discrepancy factor, which accounts for the quadratic difference between simulation and experiments The resulting comparison shows and acceptable resemblance between simulation and experiments for dense phase probability, and good agreement for bubble diameter and velocity in two dimensional beds, which is in harmony with other previous studies. However, regarding the time averaged velocity of the dense phase, the present study clearly reveals that simulation and experiments only agree qualitatively in the two dimensional bed tested, the vertical component of the simulated dense phase velocity being nearly an order of magnitude larger than the one obtained from the PIV experiments. This discrepancy increases with the height above the distributor of the two dimensional bed, and it is even larger for the horizontal component of the time averaged dense phase velocity. In other words, the results presented in this work indicate that the fine agreement commonly encountered between simulated and real beds on bubble hydrodynamics is not a sufficient condition to ensure that the dense phase velocity obtained with two fluid models is similar to that from experimental measurements on two dimensional beds.

show abstract

Section: Bubble Diameter and Velocitymentioning

confidence: 99%

Comparison between two-fluid model simulations and particle image analysis & velocimetry (PIV) results for a two-dimensional gas–solid fluidized bed

Hernández-Jiménez

Sánchez-Delgado

Gómez-García

et al. 2011

Chemical Engineering Science

108

View full text Add to dashboard Cite

show abstract

“…Caicedo et al [11] reported an experimental study of bubbling behaviour of gas-fluidized beds using digital image analysis. These authors investigated important parameters of bubbling dynamics such as bubble shape factor and aspect ratio.…”

Section: Nomenclaturementioning

confidence: 99%

Analysis of the bubbling behaviour of 2D gas solid fluidized beds

Busciglio

Vella

Micale

et al. 2008

Chemical Engineering Journal

132

View full text Add to dashboard Cite

“…Various non-intrusive measurement techniques have been introduced and applied for gasparticle flows such as particle tracking velocimetry [1], particle image velocimetry (PIV) [2], photographic image techniques [3], CCD cameras [4], phase Doppler anemometry (PDA) [5], electrical capacitance tomography (ECT) [6,7], laser Doppler anemometry (LDA) [8,9], and radioactive particle tracking [10]. Detailed information from these measurement techniques provides useful insight into system design and optimization.…”

Section: Introductionmentioning

confidence: 99%

Numerical and experimental study of horizontal pneumatic transportation of spherical and low-aspect-ratio cylindrical particles

2016

View full text Add to dashboard Cite

show abstract

A study on the behaviour of bubbles of a 2D gas–solid fluidized bed using digital image analysis

Cited by 65 publications

References 8 publications

Comparison between two-fluid model simulations and particle image analysis & velocimetry (PIV) results for a two-dimensional gas–solid fluidized bed

Comparison between two-fluid model simulations and particle image analysis & velocimetry (PIV) results for a two-dimensional gas–solid fluidized bed

Analysis of the bubbling behaviour of 2D gas solid fluidized beds

Numerical and experimental study of horizontal pneumatic transportation of spherical and low-aspect-ratio cylindrical particles

Contact Info

Product

Resources

About