Physical and hydrodynamical parameters controlling gas-liquid mass transfer

George, J.; Minel, F.; Grisenti, M.

doi:10.1016/0017-9310(94)90173-2

Cited by 17 publications

(6 citation statements)

References 27 publications

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“…The diffusivity was calculated through eqn (7) employing the parameters Q and q contributed by Reid et al 20 Table 1 shows the value of the estimated diffusivity in linear alkanes studied in the present paper. Figure 7 shows an example of the comparison between experimental and calculated values for the mass transfer coefficient, using eqn (5). In all cases the results obtained using this equation were satisfactory, with deviations of less than 5%.…”

Section: Resultsmentioning

confidence: 82%

Gas/liquid mass transfer processes in a carbon dioxide/alkane system

Gómez‐Díaz

Navaza

2005

J of Chemical Tech & Biotech

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A gas/liquid mass transfer process has been studied using carbon dioxide/alkane systems in a stirred vessel. Four linear alkanes (n-heptane, n-octane, n-decane and n-dodecane) have been used as the liquid phase in the present paper, and they have been employed to study the influence of the carbon length upon the mass transfer velocity. The mass transfer along the liquid phase has been studied using the mass transfer coefficient of the liquid phase, k L . Pure carbon dioxide has been employed as the phase in all cases for this reason. The effects of the power supplied to the liquid phase and the gas flow rate upon the absorption process have also been analysed. Finally, the equations that allow calculation of the mass transfer coefficients have been applied for these systems, with acceptable results.

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Section: Resultsmentioning

confidence: 82%

Gas/liquid mass transfer processes in a carbon dioxide/alkane system

Gómez‐Díaz

Navaza

2005

J of Chemical Tech & Biotech

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“…In addition to the model of Lamont and Scott, others such as the models of Levich-Davies and Fortescue and Pearson (1967) can be expressed in dimensionless form as shown below (George et al, 1994).…”

Section: Other Turbulent Modelsmentioning

confidence: 99%

Liquid‐phase mass transfer in spray contactors

Yeh

Rochelle

2003

AIChE Journal

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The liquid‐phase mass transfer in sprays has been measured with carbon dioxide desorption by collecting and analyzing samples of the spray. Experiments were conducted with laboratory‐ (0.009 to 0.13 L/s) and pilot‐scale (6.4 to 12.8 L/s) centrifugal hollow‐cone spray nozzles at pressure drops from 34 kPa to 138 kPa. Significant mass transfer occurred during sample collection, and a quench sampling method was developed to minimize this effect. The number of liquid‐phase transfer units (NL) due to spray impact onto walls and liquid pools was often as much as the spray NL. Approximately 60% of the spray NL occurs in the liquid sheet before droplet formation, and the droplet region can account for less than half of the total NL of the spray.

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“…This dampening increases the concentration boundary layer, significantly slowing the transfer phenomenon. George et al 56 evaluated the effect of the surfactant Hexadecanol on the horizontal and vertical velocity fluctuations close to the surface. They found that only the horizontal component was relatively dampened by the presence of surfactant and that, in the presence of these compounds, the interface behaves more like an immobile surface than as a free surface.…”

Section: Resultsmentioning

confidence: 99%

Humic substances reduce the oxygen mass transfer in the air–water interface

et al. 2020

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The aim of this study was to investigate the influence of humic substances (HS) on volumetric oxygen-transfer coefficient (K L a) under different turbulence intensities at the air-water interface. The experiments were carried out in an oscillating grid tank which provided three levels of turbulence intensities (Reynolds numbers of 5,116, 10,316, and 15,433). For each turbulence level, 15 different HS concentrations were tested and the K L a was estimated. The results showed that, regardless of the turbulence level in the tank, HS reduces K L a. The maximum reduction was 17%. The barrier effect, produced by the occupation of HS molecules at the interface, was the main phenomenon responsible for the reduction in the oxygen transfer. A relationship between the oxygen transfer velocity and turbulent kinetic energy showed that in the presence of HS, the air-water interface behaves like an immobile surface, reducing the oxygen diffusion and surface renewal.gas-water interface, grid-stirred tank, humic substances, oxygen mass transfer, reaeration

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Physical and hydrodynamical parameters controlling gas-liquid mass transfer

Cited by 17 publications

References 27 publications

Gas/liquid mass transfer processes in a carbon dioxide/alkane system

Gas/liquid mass transfer processes in a carbon dioxide/alkane system

Liquid‐phase mass transfer in spray contactors

Humic substances reduce the oxygen mass transfer in the air–water interface

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