Gas Sparger Orifice Sizes and Solid Particle Characteristics in a Bubble Column – Relative Effect on Hydrodynamics and Mass Transfer

Wongwailikhit, Kritchart; Warunyuwong, Passaworn; Chawaloesphonsiya, Nattawin; Dietrich, Nicolas; Hébrard, Gilles; Painmanakul, Pisut

doi:10.1002/ceat.201700293

Cited by 30 publications

(42 citation statements)

References 35 publications

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“…Bubble columns are widely applied in chemical engineering, biotechnology engineering, and pharmaceutical industries due to their advantages of lower gas pressure, better heat transfer coefficients, absence of moving parts, especially getting over the drawback of high‐pressure drop, etc. . To achieve a reliable design and scale‐up strategy, it is essential to get a better understanding regarding their effects on multiphase turbulent flow in terms of qualitative and quantitative aspects.…”

Section: Introductionsupporting

confidence: 67%

Effects of Sparger Holes on Gas‐Liquid Hydrodynamics in Bubble Columns

et al. 2019

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A multiphase second-order moment turbulent model was developed including an improved closure Reynolds stress transport to describe effectively the anisotropic characteristics of bubble-liquid turbulent flow. The two-phase hydrodynamics in a bubble column were numerically simulated by an in-house code. The effect of the amount of jetting holes on bubble-liquid hydrodynamics in relationship with a cell culture was investigated. Firstly, the bubble energy production correlation was proposed to verify the higher cell damage rate near gas inlet regions. The larger amounts of jetting holes resulted in an increase of bubble stress, bubble kinetic energy, and energy dissipation, particularly bubble energy production at the near gas inlet, which boosted cell damage.

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Section: Introductionsupporting

confidence: 67%

Effects of Sparger Holes on Gas‐Liquid Hydrodynamics in Bubble Columns

et al. 2019

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“…Ring solid media resulted in the smallest bubbles, followed in order by sphere, cylinder, and square media, regardless of superficial gas velocity (Vg > 5.1 × 10 −3 m/s). These differences were possibly due to the different bubble break-up rates [13] and abilities for maintaining bubble size at higher gas flow [4] for each media. For instance, ring shape solid has both a higher bubble break-up rate due to its stronger force at the edges compared to edgeless solids and its ability to capture the bubbles inside avoiding bubble coalesce at higher gas flow [18].…”

Section: Resultsmentioning

confidence: 99%

“…The bubble distribution in the reactor with media was smaller than that without media, approximately 22%-27% on average. Wongwailikhit et al (2018) [13] highlighted the three major influences of solid media addition on bubble hydrodynamics, i.e., increased bubbles breaking, increased bubbles coalescence, and decreased rising velocity. For this case, additional media was more likely enhancing the breaking rate than coalescence rate, which resulted in smaller bubbles with media.…”

Section: Resultsmentioning

confidence: 99%

“…Various types of solid particles were added into the column test to investigate their relative effects on bubble hydrodynamic characteristics and mass transfer performance. Polypropylene media was selected for this experimental work due to their slightly lower density than water, approximately 946 kg/m 3 , and uniform size, which may influence bubble distribution performance, floating and no accumulation in the bottle [13]. Four different polypropylene particles, i.e., ring, sphere, cylinder, and square sharps, were used for a comparative analysis in this study, as shown in Table 1.…”

Section: Solid Particle Mediamentioning

confidence: 99%

“…The interfacial area is the ratio between total air bubble surface and total volume including gas and solid phases. By assuming an air bubble presenting in a spherical shape, the interfacial area can be estimated by gas holdup, solid holdup, and bubble diameter [13], as expressed:…”

Section: Solid Particle Mediamentioning

confidence: 99%

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Relative Effect of Additional Solid Media on Bubble Hydrodynamics in Bubble Column and Airlift Reactors towards Mass Transfer Enhancement

et al. 2020

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Many researchers have focused on multi-phase reactor development for improving mass transfer performance. However, solid particle addition in gas–liquid contactor for better oxygen mass transfer performance is still limited. Hence, this study aims to analyze the relative effect of different types of local solid media on the bubble hydrodynamic characteristics towards mass transfer enhancement in bubble columns (BCR) and airlift reactors (ALR). This was investigated by varying solid media types (ring, sphere, cylinder, and square), solid loadings (0%–15%), and superficial gas velocities (Vg) (2.6–15.3 × 10−3 m/s) in terms of the bubble hydrodynamic and oxygen mass transfer parameters. The result showed that bubble size distribution in BCR and ALR with additional plastic media was smaller than that without media addition, approximately 22%–27% and 5%–29%, respectively, due to the increase of the bubble breaking rate and the decrease of the bubble rising velocity (UB). Further, adding media in both reactors significantly decreased the UB value. Since media increased flow resistance, resulting in decreased liquid velocity, it can also be the moving bed to capture or block the bubbles from free rising. Therefore, oxygen mass transfer performance was investigated. The oxygen transfer coefficient (KLa) in BCR with solid media addition was enhanced up to 31%–56% compared to a non-addition case, while this enhancement was greater at higher solid loading due to its higher effective surface, resulting in a higher bubble break-up rate compared to the lower loading. In ALR, up to 38.5% enhanced KLa coefficient was archived after adding plastic media over the non-addition case. In conclusion, ring and cylinder media were found to be the most significant for improving KLa value in BCR and ALR, respectively, without extra energy.

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Bubble Column CFD Model with Effects of Forced Oscillations on Bubble Dynamics

2021

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Bubble size distribution has a significant effect on gas holdup, residence time distribution, and mass transfer in bubble column reactors (BCRs). The occurrence of small gas bubbles has potential advantages such as a limited residence time distribution and perfect gas‐liquid phase contact. Gas‐liquid mass transfer in bubble columns can be significantly enhanced by subjecting the liquid phase to low‐frequency vibrations. However, the effect of vibration frequency on bubble formation and hydrodynamic characteristics in BCRs is still not well understood. Herein, a 3D numerical model of a BCR was developed to study the effect of vibration frequency on bubble dynamics under different operating conditions. The Sauter mean bubble diameter was found to be approximately inversely proportional to the vibration frequency.

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Gas Sparger Orifice Sizes and Solid Particle Characteristics in a Bubble Column – Relative Effect on Hydrodynamics and Mass Transfer

Cited by 30 publications

References 35 publications

Effects of Sparger Holes on Gas‐Liquid Hydrodynamics in Bubble Columns

Effects of Sparger Holes on Gas‐Liquid Hydrodynamics in Bubble Columns

Relative Effect of Additional Solid Media on Bubble Hydrodynamics in Bubble Column and Airlift Reactors towards Mass Transfer Enhancement

Bubble Column CFD Model with Effects of Forced Oscillations on Bubble Dynamics

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