Role of Dispersed Phase in Gas-Liquid Reactions: A Review

Kaur, Raminder; Ramakrishna, M.; Nigam, K.D.P.

doi:10.1515/revce.2007.23.3-4.247

Cited by 10 publications

(4 citation statements)

References 79 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Bubble coalescence is frequently encountered in many applications such as two-phase electrochemical systems [1][2][3], biological and pharmaceutical applications [4][5][6][7], and boiling water-cooled packed bed reactors [8][9][10]. In some cases, the coalescence of bubbles needs to be prevented, while in other cases, it must be promoted.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic non-equilibrium effects in bubble coalescence: A discrete Boltzmann study

Sun,

Gan,

et al. 2022

Preprint

View full text Add to dashboard Cite

The Thermodynamic Non-Equilibrium (TNE) effects in the coalescing process of two initially static bubbles under thermal conditions are investigated by a Discrete Boltzmann Model (DBM).The spatial distributions of the typical none-quilibrium quantity, i.e., the Non-Organized Momentum Fluxes (NOMF) during evolutions are investigated in detail. The density-weighted statistical method is used to highlight the relationship between the TNE effects and the morphological or kinetics characteristics of bubble coalescence. It is found that the xx-component and yy-component of NOMF are anti-symmetrical; the xy-component changes from an anti-symmetric internal and external double quadrupole structure to an outer octupole structure during the coalescing process.More importantly, the evolution of the averaged xx-component of NOMF provides two characteristic instants, which divide the non-equilibrium process into three stages. The first instant corresponds to the moment when the mean coalescing speed gets the maximum and at this time the ratio of minor and major axes is about 1/2. The second instant corresponds to the moment when the ratio of minor and major axes gets 1 for the first time. It is interesting to find that the three quantities, TNE intensity, acceleration of coalescence and negative slope of boundary length, show a high degree of correlation and attain their maxima simultaneously. Surface tension and heat conduction accelerate the process of bubble coalescence while viscosity delays it. Both surface tension and viscosity enhance the global non-equilibrium intensity, whereas heat conduction restrains it. These TNE features and findings present some new insights into the kinetics of bubble coalescence.

show abstract

Section: Introductionmentioning

confidence: 99%

Thermodynamic non-equilibrium effects in bubble coalescence: A discrete Boltzmann study

Sun,

Gan,

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

“…Coalescence of microbubbles are encountered in many industrial applications when gas microbubbles are generated from or injected into liquid reactants, such as solar water splitting systems [1][2][3], microbial electrolysis cells [4][5][6], and gas-liquid synthesis [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Study on coalescence dynamics of unequal-sized microbubbles captive on solid substrate

Zhou

Cao

Chen

et al. 2018

Experimental Thermal and Fluid Science

View full text Add to dashboard Cite

The dynamics of bubble coalescence are of importance for a number of industrial processes, in which the size inequality of the parent bubbles plays a significant role in mass transport, topological change and overall motion. In this study, coalescence of unequal-sized microbubbles captive on a solid substrate was observed from cross-section view using synchrotron high-speed imaging technique and a microfluidic gas generation device. The bridging neck growth and surface wave propagation at the early stage of coalescence were investigated by experimental and numerical methods. The results show that theoretical half-power-law of neck growth rate is still valid when viscous effect is neglected. However, the inertial-capillary time scale is associated with the initial radius of the smaller parent microbubble. The surface wave propagation rate on the larger parent microbubble is proportional to the inertial-capillary time scale.

show abstract

“…Recently Ramachandran [1], Kaur et al [2] as well as Dumont and Delmas [3] survey the gas absorption in presence of dispersed phase. Ramachadran focuses his survey to show the effect of solid, reacted or catalytic particles on the absorption rate applying different physical models taken from the literature mostly utilizing the shuttle mechanism [3][4][5][6][7][8][9][10] to describe the effects of particles on the mass transfer enhancement.…”

Section: Introductionmentioning

confidence: 99%

“…He does not discuss the heterogeneous model with particles freely moving in the boundary layer during the absorption. Kaur et al [2] and Dumont and Delmas [3] summarize briefly both the homogeneous and the heterogeneous models given a few expressions to predict the enhancement. No detailed analysis of the mass transport is presented.…”

Section: Introductionmentioning

confidence: 99%

Three−Phase Mass Transfer: Application of the Pseudo−Homogeneous and Heterogeneous Models

Nagy¹

2013

AJCHE

View full text Add to dashboard Cite

This paper surveyed the most important, well known two-phase mass transfer models, namely film-, film-penetration-and surface renewal models, applying them to describe the three-phase mass transfer rates at the gas-liquid interface. These models should enable the user to predict the mass transfer enhancement in the presence of a third, in the mass transport active, dispersed phase. Depending on the particle size of the dispersed phase, the pseudo-homogeneous and/or the heterogeneous model can be recommended for nanometer sized and micrometer sized particles, respectively. The effect of all important mass transport parameters, namely particle size, surface renewal frequency, diffusion depth, solubility coefficient, has been shown by typical figures. It has been analyzed how strongly depends the applicability of the homogeneous-or the heterogeneous models not only on the particle size but on the mass transport parameters. As case study, the measured and the predicted mass transfer rates have been investigated in nanofluids.

show abstract

Role of Dispersed Phase in Gas-Liquid Reactions: A Review

Cited by 10 publications

References 79 publications

Thermodynamic non-equilibrium effects in bubble coalescence: A discrete Boltzmann study

Thermodynamic non-equilibrium effects in bubble coalescence: A discrete Boltzmann study

Study on coalescence dynamics of unequal-sized microbubbles captive on solid substrate

Three−Phase Mass Transfer: Application of the Pseudo−Homogeneous and Heterogeneous Models

Contact Info

Product

Resources

About