Numerical simulation of reactive pulsing flow for the catalytic wet oxidation in TBR using a VOF technique

Lopes, Rodrigo J.G.; Sousa, Vera S.L. de; Quinta‐Ferreira, Rosa M.

doi:10.1002/aic.12585

Cited by 7 publications

(4 citation statements)

References 24 publications

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“…The liquid volume fraction can be obtained according to the following continuous equation, which is expressed as follows Rodrigo et al (2012):…”

Section: Methodsmentioning

confidence: 99%

“…The computational results were achieved with a Piecewise Linear Construction of the interface and are reviewed with reference to experimental measurements of bubble velocity and interface shape oscillations recorded based on a high speed digital camera. Rodrigo et al (2012) Lopes performed VOF numerical simulations to evaluate how liquid flow modulations could improve the detoxification of liquid effluents by catalytic wet oxidation. The VOF computations had correctly handled the experimental observations both in terms of the axial conversion and temperature.…”

Section: Introductionmentioning

confidence: 99%

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Study on Turbulent Flow of Gas and Liquid Phase LPG in Tank under Fire Based on VOF Technology

Zhao¹

2013

RJASET

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The turbulent flow state of gas and liquid phase LPG in tank under fire is complex and the VOF technology and RNG k-ε model are applied to study it and the flowing rules of LPG in tank under fire can be obtained. First, the thermal response rules of gas and liquid phase LPG under fire are discussed. Second, turbulent flow model of gas and liquid phase LPG in tank under fire, the RNG k-ε model and VOF model and solution algorithm are established. Finally, simulation of turbulent flow for gas and liquid phase LPG in tank under fire is carried out and the changing rules of different physical parameters of gas and liquid phase interface in LPG tank are obtained.

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“…The liquid volume fraction can be obtained according to the following continuous equation, which is expressed as follows Rodrigo et al (2012):…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study on Turbulent Flow of Gas and Liquid Phase LPG in Tank under Fire Based on VOF Technology

Zhao¹

2013

RJASET

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“…However, the computational resources required for a VOF method are enormous; therefore, almost all studies are conducted at the micro and mesoscopic scales, and it is difficult to predict the liquid flow texture on the bed scale. As for the Euler-Euler method, which disregards the phase interface of two or more immiscible fluids, it can only be used in pressure drop, liquid holdup, and liquid distribution predictions in a trickle bed [19,20].…”

Section: Introductionmentioning

confidence: 99%

External Wetting Efficiency in a Three-Phase Fixed Bed Loaded with Porous and Non-Porous Packings

et al. 2022

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Films and rivulets are the two basic forms of dynamic liquid in a three-phase fixed bed (trickle bed), which determines the wetting efficiency of the catalyst. This paper is devoted to the conflicting wetting performance observed between non-porous glass beads and porous alumina pellets, and a parallel zone model is applied to resolve the complex liquid flow texture. This shows that in the case of glass beads, the wetting efficiencies of the catalyst along with the liquid flow rate in increasing and decreasing branches are different, especially when the gas flow rate is low. In comparison, there is almost no wetting difference for the alumina pellets with respect to liquid flow rate increasing or decreasing. The dynamic liquid is significantly more uniformly distributed over the cross-section in the Al2O3 bed than in the glass one.

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“…Process intensification in CWAO of organic pollutant in TBRs, for example, targeting in achieving higher conversion rates under milder reaction conditions, is an expected direction for wastewater treatment. [19,20] Under suitable operating condition, CWAO of phenol is a fast reaction comparing to mass transfer resistance in conventional TBRs. [6] Process intensification in CWAO of phenol has been conducted, through: (a) developing novel catalysts, such as ceria-based [17] and carbon materials [18] ; (b) optimization of operating conditions, temperature, wettability of catalyst as well as gas and liquid flow rates are usually included.…”

Section: Introductionmentioning

confidence: 99%

Process intensification in catalytic wet air oxidation of phenol via coupling gas‐liquid microdispersion with trickle bed reactors

Tan

Nie

et al. 2019

J Adv Manuf & Process

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Intensified trickle bed reactors were developed for catalytic wet air oxidation (CWAO) of phenol, by generating microbubbles before gas/liquid fluid flows along catalyst packed-beds. By coupling gas-liquid microdispersion module, phenol disappearance rate significantly increases under the same operating conditions and phenol conversion reaches 92% in 22 seconds at 160 C and 1000 kPa. Effects of operating conditions were studied systematically and results demonstrated characteristics of high-interaction regime at low Reynolds number. Comparison of effects among mass transfer and reaction steps shows CWAO reaction is controlled by resistance to liquid-solid mass transfer of phenol in most cases, while gas-liquid mass-transfer-resistance is ignorable. A dimensionless correlation, Sh = 2.29φ −0.91 (Re L + Re G ) 0.04 , was established, by considering influences of liquid film thickness and fluid flow situations on liquid-solid mass transfer coefficient in microbubblein-liquid/catalyst-particle system. The study would provide an effective method for intensifying CWAO and other liquid-solid-mass-transfer-resistance-controlled gas/ liquid/solid catalytic reactions and help understand mass transfer mechanism in new gas/liquid/solid system. K E Y W O R D Sintensified process fundamentals, modeling and simulation, process intensification

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Numerical simulation of reactive pulsing flow for the catalytic wet oxidation in TBR using a VOF technique

Cited by 7 publications

References 24 publications

Study on Turbulent Flow of Gas and Liquid Phase LPG in Tank under Fire Based on VOF Technology

Study on Turbulent Flow of Gas and Liquid Phase LPG in Tank under Fire Based on VOF Technology

External Wetting Efficiency in a Three-Phase Fixed Bed Loaded with Porous and Non-Porous Packings

Process intensification in catalytic wet air oxidation of phenol via coupling gas‐liquid microdispersion with trickle bed reactors

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