Correction of Terminal Velocity Prediction Model for CO&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt;-Kerosene and Air-Kerosene Systems by Artificial Intelligence

Mahmoudi, Sadra; Shahraki, Bahram Hashemi; Aghajani, M.

doi:10.11648/j.se.20170505.11

Cited by 3 publications

(1 citation statement)

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“…Rather than the overall hold-ups, the profile of gas hold-up is also important because of impacting the pressure variation and liquid recirculation which plays a vital role in mixing and mass and heat transfer [77]. The radial profile of gas hold-up depends on various parameters like liquid properties, superficial gas velocity, column size, operating pressure and temperature, sparger design and solid properties.…”

Section: Flow Regimementioning

confidence: 99%

Effect of Solid Particles on the Slurry Bubble Columns Behavior – A Review

Mahmoudi

Hlawitschka

2021

ChemBioEng Reviews

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A wide-ranging review is presented on the most focal aspects of gas-liquid-solid reactors to discuss the fresh headways towards the understanding of slurry bubble column reactors' behavior. In more detail, in this critical review, published works' findings concerning the effects of solid particles characteristics (size, concentration and density) on volumetric mass transfer coefficient, liquid-side mass transfer coefficient, gas-liquid interfacial area, gas hold-up and flow regime are deliberated. Besides, the effects of other pivotal parameters such as pressure, temperature, reactor size, height of liquid, gas distributor, density, and viscosity on the performance of slurry bubble column reactors are considered. Eventually, regarding the effects of each of the aforementioned parameters on the performance of reactor, logical conclusions are drawn.

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Section: Flow Regimementioning

confidence: 99%

Effect of Solid Particles on the Slurry Bubble Columns Behavior – A Review

Mahmoudi

Hlawitschka

2021

ChemBioEng Reviews

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Bubble dynamics under the influence of the Marangoni force induced by a stratified field of contamination

Mahmoudi,

Saeedipour,

Hlawitschka

2024

Exp. Comput. Multiph. Flow

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The Marangoni effect assumes significance in bubbly flows when temperature or concentration gradients exist in the domain. This study investigated the hydrodynamics of single bubbles under the influence of the Marangoni force induced by stratified fields of dissolved sugar, providing a numerical framework for examining these phenomena. A laboratory-scale bubble column and high-speed imaging were utilized to analyze the bubble behavior. The OpenFOAM-based geometric volume of the fluid solver was extended by incorporating the solutocapillary Marangoni effect, and a passive scalar transport equation for the sugar concentration was solved. The results revealed that small bubbles entering regions with elevated sugar concentrations experienced deceleration, transitioning into linear paths, while those departing from regions with high sugar concentrations exhibited fluctuations and meandering. Furthermore, the concentration gradient leads larger bubbles to meander throughout the entire column, without a notable increase in their velocity. The intensity of these behaviors is governed by the magnitude of the Marangoni force. The findings provide a better understanding of single bubble hydrodynamics in complex environments.

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