Phase holdup characteristics in three phase fluidized beds

Han, Joo Hee; Wild, Gabriel; Kim, Sang D.

doi:10.1016/0300-9467(90)80002-t

Cited by 28 publications

(22 citation statements)

References 19 publications

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“…Correlations of bed porosity and liquid phase holdup in three-phase fluidized beds have been reported by previous investigators (Kim et al, 1975;Begovich and Watson, 1978;Han et al, 1988). The phase holdup data of the present study in the bubble disintegrating regime [d, = 3.0, 3.7, 6.0 mm] are found to be well represented by the correlations of Kim et al (1975).…”

Section: Correlationssupporting

confidence: 87%

Gas‐Liquid mass transfer in a three‐phase fluidized bed with floating bubble breakers

Kim

1990

Can J Chem Eng

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The effects of liquid and gas velocities, particle size and volume ratio of floating bubble breakers to solid particles (V,/v,) on both the volumetric mass transfer coefficient, k,a, and the gas-liquid interfacial area, a, have been determined in three-phase fluidized beds with floating bubble breakers. Beds having a volume ratio (V,/V,) of about 0.15 showed a maximum increase in both k,a and a of about 30% in comparison to that in the corresponding bed without floating bubble breakers. The volumetric mass transfer coefficient in three-phase fluidized beds with or without tloating bubble breakers can be estimated from the surface renewal frequency of liquid microeddies and the particle size. a 7 On a dktermint dans des lits fluidisis triphasiques munis de rupteurs de bulles flottantes les effets de la vitesse du gaz et du liquide, le rapport entre la taille des particules et le volume des rupteurs de bulles tlottantes et le coefficient de transfert de matikre, kp, ainsi que la surface interfaciale gas-liquide, a. Les lits ayant un rapport de volume (V,lv,) d'environ 0,15 montrent une augmentation maximale B la fois dans kp et a d'cnviron 30% par cornparaison a celle du lit corrcspondant sans rupteurs de bulles flottantes. Le coefficient volumetrique de transfert de rnatibre dans les lits fluidises triphasiques avec ou sans rupteurs de bulles flottantes peut itre estimC Zi partir de la frkquence de renouvellement dc la surface des micro-tourbillons liquides et la taille des particules.

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Section: Correlationssupporting

confidence: 87%

Gas‐Liquid mass transfer in a three‐phase fluidized bed with floating bubble breakers

Kim

1990

Can J Chem Eng

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“…Considerable work has been carried out on the gas holdup in three-phase fluidized columns. Various aspects of these fluidized beds have been reviewed by several investigators (Catros et al, 1985;Epstein, 1981;Kato et al, 1981;Kim et al, 1975;Muroyama and Fan, 1985;Fan, 1989;Okamura et al, 1989;Han et al, 1990;Lee and Lasa, 1987;Lee et al, 2001;Safoniuk et al, 2002;Song et al, 1989;Yu and Kim, 1986), which include the importance of gas holdup and various factors affecting it.…”

Section: Introductionmentioning

confidence: 98%

Prediction of gas holdup in a three-phase fluidized bed from bed pressure drop measurement

Jena

Roy

Meikap

2008

Chemical Engineering Research and Design

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“…The effect of gas density was significant both with and without the particles present, with gas holdup increasing, bed voidage increasing and liquid holdup decreasing with increasing gas density. The holdup correlations of Han et al (1990) have been modified to incorporate the effect of gas density.…”

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confidence: 99%

Effect of Gas Density on the Hydrodynamics of Bubble Columns and Three‐Phase Fluidized Beds

Macchi

Grace

et al. 2003

Can J Chem Eng

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Experiments were performed at ambient temperature and pressure in a 127 mm inner diameter column with a 55% wt. aqueous glycerol solution, 6‐mm spherical borosilicate beads and four gases — helium, air, carbon dioxide and sulphur hexafluoride — giving a 35‐fold gas density range. The dispersed bubble flow regime was sustained to higher gas velocities and gas holdups for denser gases. This finding appears to be due to the reduction of the maximum stable bubble size (i.e. enhanced bubble break‐up), rather than to formation of smaller bubbles at the distributor with increasing gas density. The effect of gas density was significant both with and without the particles present, with gas holdup increasing, bed voidage increasing and liquid holdup decreasing with increasing gas density. The holdup correlations of Han et al. (1990) have been modified to incorporate the effect of gas density.

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Phase holdup characteristics in three phase fluidized beds

Cited by 28 publications

References 19 publications

Gas‐Liquid mass transfer in a three‐phase fluidized bed with floating bubble breakers

Gas‐Liquid mass transfer in a three‐phase fluidized bed with floating bubble breakers

Prediction of gas holdup in a three-phase fluidized bed from bed pressure drop measurement

Effect of Gas Density on the Hydrodynamics of Bubble Columns and Three‐Phase Fluidized Beds

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