Mass transfer to the wall of a packed and unpacked bubble column operating with Newtonian and non-Newtonian liquids

Khamadieva, R.; Böhm, Ursula

doi:10.1016/j.cej.2005.11.003

Cited by 20 publications

(16 citation statements)

References 12 publications

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“…The wall-to-bulk mass transfer coefficient data were also obtained in the empty column with gas-liquid upflow and in homogeneous flow with helicoidal tape promoter. In these two cases, the wall-to-bulk mass transfer coefficients were found to agree the data of Khamadieva and Böhm [5] and Sujatha et al [8], respectively.…”

Section: Resultssupporting

confidence: 83%

“…The gas holdup data thus obtained for the empty column were found to be in good agreement with that of Khamadieva and Böhm [5]. The wall-to-bulk mass transfer coefficient data were also obtained in the empty column with gas-liquid upflow and in homogeneous flow with helicoidal tape promoter.…”

Section: Resultssupporting

confidence: 82%

“…Although many investigations *Author for Correspondence. E-mail: kvramesh69@yahoo.com Paper received: 11/12/2008; Revised paper accepted: 04/09/2009 have been reported on wall-to-bulk heat transfer, only a few studies have been carried out on wall-to-bulk mass transfer in bubble columns [1][2][3][4][5][6]. Also, investigations on the magnitudes of augmentation using helicoidal or composite type of the promoter does not seem to be available in the existing literature.…”

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confidence: 99%

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Wall-to-bulk Mass Transfer in a Two-phase Upflow Bubble Column with a Composite Promoter

Ramesh

Raju

Murty

et al. 2010

Indian Chemical Engineer

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Experiments were conducted to investigate the effect of pertinent dynamic and geometric variables on wall-to-bulk mass transfer coefficient in two-phase upflow bubble column in the presence of a composite promoter. The liquid phase is an electrolyte consisting of equimolal solution of potassium ferrocyanide and ferricyanide of 0.01 N with 0.5 N sodium hydroxide. The gas phase is nitrogen and a 6.73 cm i.d. acrylic column was employed as the test section. Helical tapes of four different widths wound on central rods of three different diameters with five varying pitches were used as composite promoter elements along with annular rods of four different diameters. Measurement of limiting currents at point electrodes fixed flush with the inner surface of the test section facilitated the computation of wall-to-bulk mass transfer coefficients. The wall-to-bulk mass transfer coefficient was found to increase with increase in liquid and gas velocities in the presence of the promoter. The effect of rod diameter, tape width and tape pitch yielded improvements upto 40% at lower liquid and gas velocities. The entire data were correlated with the equation j D = 110.3 (Re) -0.8424 (Fr g ) 0.089 .

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Section: Resultssupporting

confidence: 83%

Section: Resultssupporting

confidence: 82%

mentioning

confidence: 99%

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Wall-to-bulk Mass Transfer in a Two-phase Upflow Bubble Column with a Composite Promoter

Ramesh

Raju

Murty

et al. 2010

Indian Chemical Engineer

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“…The advantage of using the Stanton dimensionless number as compared to the Sherwood dimensionless number to describe mass transfer is that the Stanton dimensionless number is independent of diffusivity term, and mass transfer is correlated as a lumped variable K L a. An empirical correlation for the empty and packed bubble column is proposed as: 14 …”

Section: Axial Dispersionmentioning

confidence: 99%

Gas Holdup, Axial Dispersion, and Mass Transfer Studies in Bubble Columns

Shah

Kiss

Zondervan³

et al. 2012

Ind. Eng. Chem. Res.

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This article presents an extensive study on the gas holdup, axial liquid dispersion, and mass transfer for packed, trayed, and empty bubble columns. Four types of structured packings (Super-Pak, Flexipac, Mellapak, and Gauze) and two types of perforated partition trays (with 25% and 40% tray open area) were used to characterize the packed and trayed bubble columns, respectively. It was observed that the gas holdup and mass transfer characteristics of the packed and trayed bubble columns are superior to those of an empty bubble column, while the axial dispersion coefficients are much lower. This article discusses in detail the effect of the liquid and gas flow rates, liquid-phase viscosity, and type of internals. Additionally, experimental data of the packed, trayed, and empty bubble column are correlated by dimensionless numbers. Novel empirical correlations are proposed for the gas holdup, Bodenstein number (for the axial dispersion coefficient), and Stanton number (for the volumetric mass transfer coefficient), as a function of the Froude and Galileo dimensionless numbers.

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“…Few similar works were also reported in two-phase up flow bubble columns (Sarma et al, 2011;Subramanyam et al, 2014;Ramesh et al, 2009;Suresh et al, 2014;Khamadieva and Bohm, 2006;Verma and Rai, 2003) in the absence and presence of promoters. By giving up high heat and mass transfer rates, the bubble columns also had the advantages of uniform temperature and concentration coupled with better controllability.…”

Section: Introductionmentioning

confidence: 60%

Wall-to-Bulk Mass Transfer in Cocurrent Upflow Bubble Column with Coaxially Placed String of Spheres

Kumar¹,

Kumar²,

Venkateswarlu³

et al. 2016

AJHMT

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To exploit the advantage of obtaining enhanced mass transfer rates in electrochemical processes, in the present study, experiments were conducted in gas-liquid up-flow electrochemical cells in the presence of string of disc promoter internal. Computation of mass transfer coefficients was facilitated by the measurement of limiting currents at the electrodes fixed flush with the inner surface of the perspex tube wall. An equimolar potassium ferrocyanide and potassium ferricyanide solution in the presence of sodium hydroxide supporting electrolyte was used as the liquid phase and nitrogen was used as the inert gas phase. In gas-liquid up flow bubble columns in the presence of string of sphere promoter, the mass transfer coefficients were found to increase slightly with gas velocity, sphere diameter and rod diameter. The influence of liquid velocity and pitch was found to be negligible. The data were correlated using jD factor.

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Mass transfer to the wall of a packed and unpacked bubble column operating with Newtonian and non-Newtonian liquids

Cited by 20 publications

References 12 publications

Wall-to-bulk Mass Transfer in a Two-phase Upflow Bubble Column with a Composite Promoter

Wall-to-bulk Mass Transfer in a Two-phase Upflow Bubble Column with a Composite Promoter

Gas Holdup, Axial Dispersion, and Mass Transfer Studies in Bubble Columns

Wall-to-Bulk Mass Transfer in Cocurrent Upflow Bubble Column with Coaxially Placed String of Spheres

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