Bubble size distribution in two-dimensional gas-solid fluidized beds

In this article, the digital image analysis (DIA) technique has been used to study the bubble size and bubble size distribution evolution in a pseudo-two-dimensional gas–solid fluidized bed. In addition, a numerical discrete bubble model (DBM) based on the bubble–bubble interactions was developed and the model predictions were compared with the experimental data. The developed model can predict the bubble size and bubble size distribution through the bed height and the lateral distribution of bubbles. Comparison between model predictions and the result of DIA measurements shows that bubble breakage has a significant effect on the bubble size distribution especially at heights far from the distributor plate. Moreover, lateral bubble distribution of the bed was investigated.

[1]  Nigel N. Clark,et al.  Relationships between distributions of chord lengths and distributions of bubble sizes including their statistical parameters , 1995 .

[2]  D. Santana,et al.  Local bubble‐size distribution in fluidized beds , 2000 .

[3]  D. Thoenes,et al.  Investigation on bubble characteristics in a gas fluidized bed , 1997 .

[4]  J. Laverman.  On the hydrodynamics in gas phase polymerization reactors : On the hydrodynamics in gas polymerization reactors , 2010 .

[5]  G. Taylor,et al.  The mechanics of large bubbles rising through extended liquids and through liquids in tubes , 1950, Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences.

[6]  P. K. Agarwal.  Bubble characteristics in gas fluidized beds , 1985 .

[7]  Martin van Sint Annaland,et al.  Investigation into the hydrodynamics of gas–solid fluidized beds using particle image velocimetry coupled with digital image analysis , 2008 .

[8]  C. Y. Wen,et al.  Estimation of bubble diameter in gaseous fluidized beds , 1975 .

[9]  Salman Movahedirad,et al.  Discrete Bubble Model for Prediction of Bubble Behavior in 3D Fluidized Beds , 2012 .

[10]  D. Geldart.  Types of gas fluidization , 1973 .

[11]  Joachim Werther,et al.  Measurement techniques in fluidized beds , 1999 .

[12]  Todd Pugsley,et al.  A critical evaluation of literature correlations for predicting bubble size and velocity in gas–solid fluidized beds , 2011 .

[13]  F. Johnsson,et al.  Digital image analysis of hydrodynamics two-dimensional bubbling fluidized beds , 2004 .

[14]  Ng Niels Deen,et al.  Novel phenomenological discrete bubble model of freely bubbling dense gas-solid fluidized beds : application to two-dimensional beds , 2012 .

[15]  C. Sobrino,et al.  Experimental and computational study on the bubble behavior in a 3-D fluidized bed , 2011 .

[16]  Yuri A. Sergeev,et al.  EXPERIMENTAL OBSERVATIONS OF VOIDAGE DISTRIBUTION AROUND BUBBLES IN A FLUIDIZED BED , 1994 .

[17]  Akira Nonaka,et al.  A generalized bubble diameter correlation for gas‐solid fluidized beds , 1987 .

[18]  C. Sobrino,et al.  Maximum entropy estimation of the bubble size distribution in fluidized beds , 2009 .

[19]  Jam Hans Kuipers,et al.  Modelling of large-scale dense gas-solid bubbling fluidised beds using a novel discrete bubble model , 2006 .

[20]  Nicholas P. Cheremisinoff,et al.  Review of experimental methods for studying the hydrodynamics of gas-solid fluidized beds , 1986 .

[21]  Lucio Rizzuti,et al.  Experimental analysis of bubble size distributions in 2D gas fluidized beds , 2010 .

[22]  H.E.A. van den Akker,et al.  Analysis of a bubbling 2-D gas-fluidized bed using image processing , 1994 .

[23]  Reuel Shinnar,et al.  Bubble growth by coalescence in gas fluidized beds , 1971 .

[24]  G. Stephanopoulos,et al.  Flux amplification in complex metabolic networks , 1997 .