Journal Article10.1016/S0009-2509(01)00215-9
Effect of bubble column dimensions on flow regime transition
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TL;DR: In this paper, detailed and consistent experimental data are presented on the effect of column size on the homogeneous-heterogeneous regime transition in bubble columns, and the results show that both the column height and width destabilize the heterogeneous regime and advance the transition.
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About: This article is published in Chemical Engineering Science. The article was published on 01 Nov 2001. The article focuses on the topics: Bubble.
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Citations
Effect of surfactant on homogeneous regime stability in bubble column
TL;DR: In this paper, the effect of surface active agents on homogeneous-heterogeneous flow regime transition in a laboratory scale bubble column was investigated and the critical point where the homogeneous regime loses stability and the transition begins was evaluated by several methods.
88
Uniform Flow in Bubble Columns
TL;DR: In this paper, the authors used a special needle sparger consisting of 559 separate needles, uniformly distributed over the bottom of a 15 cm bubble column, to ensure that all bubbles generated are of the same size and that the bubble injection is very uniform over the entire bottom of the column.
84
Detecting regime transitions in slurry bubble columns using pressure time series
K.C. Ruthiya,VP Vinit Chilekar,VP Vinit Chilekar,Maurice J. F. Warnier,John van der Schaaf,Ben F.M. Kuster,JC Jaap Schouten,J. Ruud van Ommen +7 more
TL;DR: In this paper, changes in the coherent standard deviation and in the average frequency of measured pressure time series with gas velocity are proposed, as unique and unambiguous criteria to mark flow regime transitions in slurry bubble columns.
81
Global and local hydrodynamics of bubble columns – Effect of gas distributor
TL;DR: In this paper, a cylindrical laboratory bubble column (2 m tall, 0.127 m dia) was used to measure the gas holdups and bubble sizes at one cross-sectional horizontal plane (1 m above distributor).
80
Bubble columns with fine pore sparger operating in the pseudo-homogeneous regime: Gas hold up prediction and a criterion for the transition to the heterogeneous regime
TL;DR: In this article, the effect of liquid properties and sparger characteristic (i.e., pore size, dimensions) on gas holdup at the pseudo-homogeneous regime was studied and a correlation regarding the prediction of the transition point from the pseudohomogeneous to the heterogeneous regime has been proposed and found to be in good agreement with available data.
76
References
Design parameters estimations for bubble column reactors
TL;DR: In this article, the present state-of-the-art for the estimation of nonadjustable parameters in bubble column reactors is evaluated and a discussion is followed by relevant recommendations for their predictions.
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A new theory of the instability of a uniform fluidized bed
TL;DR: In this article, the form of the momentum equation for one-dimensional (vertical) unsteady mean motion of solid particles in a fluidized bed or a sedimenting dispersion is established from physical arguments.
423
Design parameters estimation for scale-up of high-pressure bubble columns
TL;DR: In this paper, a new improved gas hold-up equation is developed that incorporates the influence of gas and liquid properties with an average error of approximately 10% for two column sizes.
390
Improved tools for bubble column reactor design and scale-up☆
W.-D. Deckwer,Adrian Schumpe +1 more
TL;DR: In this article, the present status of estimating gas hold-ups, mass transfer and mixing coefficients of bubble columns is reviewed, and specific recommendations are given for their application, based on proven correlations and recent improvements.
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