Gas‐liquid mass transfer in the bubble column with viscoelastic liquid

The volumetric liquid-phase mass transfer coefficient, k L a, was determined by absorption of oxygen in air using six different carboxy-methyl cellulose (CMC) solutions with different rheological values in three phase spout-fluid beds operated continuously with respect to both gas and liquid. Three cylindrical columns of 7.4 cm, 11.4 cm, and 14.4 cm diameters were used. Gas velocity was varied between 0.00154±0.00563 m/s, liquid velocity between 0.0116±0.0387 m/s, surface tension between 0.00416±0.0189 N/m, static bed height between 6.0±10.8 cm, and spherical glass particles of 1.75 mm diameter were used as packing material. A single nozzle sparger of 1.0 cm diameter was used in the spouting line. The volumetric mass transfer coefficient was found to increase with gas velocity, liquid velocity, and static bed height and to decrease with the increase of the effective liquid viscosity of the CMC solution. A dimensionless correlation was developed and compared with those listed in the literature.

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“…Suh et al's correlation [7] provided the closest predictions of k L a but still underestimated the experimental data by about 16 %. Fig.…”

Section: Correlation Of the Liquid Sidementioning

confidence: 83%

“…This value was taken to correlate the mass transfer coefficient in non-Newtonian fluids [8,13,19]. However, for the flow index (0.18 £ n £ 1.0), the value of C s = 2800 m ±1 was suggested [7,10].…”

Section: Methodsmentioning

confidence: 99%

Volumetric Mass Transfer Coefficient in non‐Newtonian Fluids in Spout Fluid Beds

Anabtawi

Hilal²,

Muftah³

2003

Chem Eng & Technol

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“…[308] and the discussion in refs. [309][310][311]); for example, the correlation of Schumpe [18] reads as follows:…”

Section: The Mass Transfer Correlationsmentioning

confidence: 99%

Two-Phase Bubble Columns: A Comprehensive Review

2018

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We present a comprehensive literature review on the two-phase bubble column; in this review we deeply analyze the flow regimes, the flow regime transitions, the local and global fluid dynamics parameters, and the mass transfer phenomena. First, we discuss the flow regimes, the flow regime transitions, the local and global fluid dynamics parameters, and the mass transfer. We also discuss how the operating parameters (i.e., pressure, temperature, and gas and liquid flow rates), the operating modes (i.e., the co-current, the counter-current and the batch modes), the liquid and gas phase properties, and the design parameters (i.e., gas sparger design, column diameter and aspect ratio) influence the flow regime transitions and the fluid dynamics parameters. Secondly, we present the experimental techniques for studying the global and local fluid dynamic properties. Finally, we present the modeling approaches to study the global and local bubble column fluid dynamics, and we outline the major issues to be solved in future studies.

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“…14. Correlations have been developed for air -water systems [22,24,36,37]. Different liquids have been used by researchers for evaluating the volumetric oxygen mass transfer coefficient, such as aqueous solutions of glycerol, methanol and sodium sulphite [36] non-Newtonian fluids such as solutions of carboxymethyl cellulose (CMC), poly acrylamide (PAA) and xanthan gum [38] aqueous solutions of carboxypoly methylene and CMC [14], aqueous sucrose solution [39] and aqueous NaOH solution [40]. Unlike the correlations for gas holdup where many of the correlations involve only gas velocity, dimensionless correlations for k L a (Sherwood number) have been reported in terms of dimensionless numbers such as Schmidt number, Bond number, Galileo number and Froude number.…”

Section: Respectively the Developed Correlation Ismentioning

confidence: 99%