Effect of liquid coalescing properties on mass transfer, heat transfer and hydrodynamics in a three-phase fluidized bed

Pozo, M. Del; Briens, Cédric; Wild, Gabriel

doi:10.1016/0923-0467(94)87001-2

Cited by 5 publications

(5 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The increment in k L a was insignificant at lower gas velocities. The increment in k L a with the addition of BA in a fluidized bed reactor has reported by Del Pozo et al 32 The increase in k L a may be due to the bubble coalescence inhibition characteristics of BA and decrease in bubble size and hence increment in interfacial area. In the air–BA–nylon‐6 system, 6, 11.5 and 21% increases in k L a were observed for 20, 40 and 60 g m −3 additions of BA compared with the air–deionized water–nylon‐6 system at a U sg of 0.015 m s −1 .…”

Section: Resultsmentioning

confidence: 70%

Volumetric mass transfer coefficients in an internal loop airlift reactor with low‐density particles

Muthukumar

Velan

2006

J of Chemical Tech & Biotech

View full text Add to dashboard Cite

Section: Resultsmentioning

confidence: 70%

Volumetric mass transfer coefficients in an internal loop airlift reactor with low‐density particles

Muthukumar

Velan

2006

J of Chemical Tech & Biotech

View full text Add to dashboard Cite

“…The radially averaged coefficient did not significantly vary with height. Del Pozo et al (1991a) showed that fixed spheres such as used in this study gave, in practice, the same results as tethered spheres which themselves gave the same results as completely free spheres, provided the tether was long enough (Prakash et al, 1984). Details are provided by Del Pozo et al (1991a,b).…”

Section: Methodsmentioning

confidence: 59%

Effect of column inclination on the performance of three‐phase fluidized beds

1992

Self Cite

View full text Add to dashboard Cite

show abstract

“…The effect of coalescence inhibition on three-phase fluidization hydrodynamics has been the subject of thorough experimental studies. ,− Unfortunately, how coalescence inhibition affects the mechanisms of bubble coalescence and fragmentation in the presence of solid particles is not well understood. Thus far, a treatment, from a fundamental standpoint, of the influence of this phenomenon on fluidization hydrodynamics remains elusive.…”

Section: Ann-da Approachmentioning

confidence: 99%

Three-Phase Fluidization Macroscopic Hydrodynamics Revisited

Larachi

Belfares

Iliuta

et al. 2001

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

The state-of-the-art tools for the evaluation of the macroscopic hydrodynamics of cocurrent upflow three-phase fluidization are critically evaluated by thoroughly interrogating the broadest fluidization database ever built. The database is compiled through worldwide conjoint initiatives as a result of a decade of compilation efforts by the groups of professors L. S. Fan (Columbus, OH), S. D. Kim (Seoul, South Korea), and G. Wild (Nancy, France) and our Laval University group. The database represents almost the whole heritage of the nonproprietary data released in the open literature in the field of gas-liquid-solid fluidization (23 000 experiments on bed porosity and liquid, gas, and solid holdups). It is dedicated to embracing wide-ranging fluids' properties, particle and vessel sizes, and operating conditions. The database contains 55 Newtonian (20 500 data), 19 non-Newtonian liquids (2500 data), 110 various particles, and 17 different column diameters and includes wall effect ratios D c /d p and grain sizes ranging from 8 to 800 mm and from 0.25 to 15 mm. Two novel approaches in the field of three-phase fluidization modeling are proposed to reconcile the formidable diversity of patterns and the wide variability of hydrodynamic parameters encountered in this advanced database. Both of them exhibit a substantial gain in their forecasting ability with respect to the currently known prediction methods. The first approach relies on the combination of multilayer perceptron artificial neural networks and dimensional analysis (ANN-DA approach) to derive three highly accurate correlations for bed porosity and liquid and gas holdups. The second is based on a phenomenological hybrid k-x generalized bubble wake model (k-x GBWM) in which the wake parameters k and x are beforehand extracted by solving an inverse k-x GBW model. The ANN-DA approach is then applied to correlate k and x in terms of the accessible fluidization input characteristics and fed into the k-x GBWM to forecast the phase holdups. The robustness of the proposed ANN-DA correlations and k-x GBWM is assessed, and the limitations of the correlations with regard to their generalization capabilities are discussed.

show abstract

Effect of liquid coalescing properties on mass transfer, heat transfer and hydrodynamics in a three-phase fluidized bed

Cited by 5 publications

References 14 publications

Volumetric mass transfer coefficients in an internal loop airlift reactor with low‐density particles

Volumetric mass transfer coefficients in an internal loop airlift reactor with low‐density particles

Effect of column inclination on the performance of three‐phase fluidized beds

Three-Phase Fluidization Macroscopic Hydrodynamics Revisited

Contact Info

Product

Resources

About