Diluted alcohol solutions in bubble columns and draft tube airlift reactors with a single orifice sparger: experiments and simple correlations

Šijački, Ivana M.; Čolović, Radmilo; Petrović, Dragan Lj.; Tekić, Miodrag N.; Đurić, Mirjana S.

doi:10.1002/jctb.2266

Cited by 14 publications

(25 citation statements)

References 16 publications

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“…In contrast, Figure 6, shows little effect of ethanol concentration on the mean void fraction in the homogeneous regime. However, Sijacki et al (2009) show that the surface tension gradient for IPA is around three times greater than that for ethanol and hence the greater molecular weight alcohol can be expected to have a much more significant effect on the bubble rise velocity and coalescence immediately above the sparger . These observations are similar to the findings of Zahradnik et al (1999) for the effect of carbon chain length on the mean void fraction.…”

Section: Effects Of Alcohol Concentration On Mean Gas Void Fractionsmentioning

confidence: 95%

“…increasing carbon chain length: ethanol > IPA > n-propanol > n-butanol (Sijacki et al, 2009). Hence the greater molecular weight alcohol (in this case IPA) provides a stronger effect on two-phase hydrodynamics (Albijanic et al 2007).…”

Section: (2010)mentioning

confidence: 95%

“…The presence of relatively small amounts of alcohol increases the gas void fraction,  , in aqueous solutions in bubble columns (Camaras et al, 1999;Sijacki et al, 2009) by inhibiting coalescence. Alcohols comprise hydrophilic (polar) and hydrophobic (carbon chain) parts, as shown in Figure 1.…”

Section: Introductionmentioning

confidence: 99%

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An experimental study of gas void fraction in dilute alcohol solutions in annular gap bubble columns using a four-point conductivity probe

Al-Oufi

Rielly

Cumming

2011

Chemical Engineering Science

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The influence of alcohol concentration on the gas void fraction in open tube and annular gap bubble columns has been investigated using a vertical column with an internal diameter of 0.102 m, containing a range of concentric inner tubes which formed an annular gap; the inner tubes had diameter ratios from 0.25 -0.69. Gas Moreover, isopropanol results gave slightly higher mean void fractions compared to those for ethanol at the same mass fraction, due to their increased carbon chain length. It was shown that the void fraction profiles in the annular gap bubble column were far from uniform, leading to lower mean void fractions than were obtained in an open tube for the same gas superficial velocity and liquid composition.

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Section: Effects Of Alcohol Concentration On Mean Gas Void Fractionsmentioning

confidence: 95%

Section: (2010)mentioning

confidence: 95%

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An experimental study of gas void fraction in dilute alcohol solutions in annular gap bubble columns using a four-point conductivity probe

Al-Oufi

Rielly

Cumming

2011

Chemical Engineering Science

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“…To apply the model that covers the whole range of ELAR sizes (see Tab. 2), the geometrical parameter A d /A r must be included. In previous investigations, we successfully fitted experimental values with these parameters by using correlations [4,12,13,37]. The general form of the applied power law correlations was:…”

Section: Correlationmentioning

confidence: 99%

Influence of the Sparger Type and Added Alcohol on the Gas Holdup of an External‐Loop Airlift Reactor

et al. 2015

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The influences of alcohol adding and three different gas spargers (single orifice, perforated plate, and sinter plate) on the gas holdup in an external-loop airlift reactor were studied. The experimental results show that the gas holdup can be increased by mutual influence of both the alcohol adding and the sparger type. The presence of small amounts of normal aliphatic alcohols caused an increase of the gas holdup compared to the air-water system, due to their coalescence-inhibiting nature. The sinter plate was the most efficient sparger, followed by the perforated plate and the single orifice. A proposed artificial neural network (ANN) has the potential to predict gas holdup values in airlift reactors for various alcohols and types of gas spargers.

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“…Bubbling behavior of gas–liquid two‐phase flow widely exists in chemical, biological, environmental industries, etc . Especially for various multiphase reactor applications, such as gas–liquid bubble column reactor, gas–liquid–solid fluidized reactor, and sieve‐plate column reactor, the initial detachment state of the bubbles is critical to the shape, size, oscillation, interaction, dissolution of bubbles during the subsequent migration.…”

Section: Introductionmentioning

confidence: 99%

Bubble dynamics and mass transfer characteristics from an immersed orifice plate

Shi

Jiang

Liu

et al. 2020

J of Chemical Tech & Biotech

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BACKGROUND: Bubble dynamics plays an important role in performance enhancement of multiphase reactor. The formation of the bubbles at the orifice is critical for the dynamics of bubbles and the mass transfer process during the rising stage. However, few studies have focused on the detailed changing characteristic of bubble formation and its relationship with mass transfer.RESULTS: The evolution of the bubble dynamics from millimeter to micrometer-sized immersed orifice plates is in situ visualized. Bubble inrush is observed from the orifices with diameters below 421 ∼m, resulting in significant fluctuation on the gas-liquid interface. The base of the leading bubble varies with the orifice diameter. Smaller orifice is preferred to produce more trailing bubbles with smaller size. The inrush time of the trailing bubble is prolonged with decreasing orifice diameter and increasing gas velocity. The inrush time and diameter of the latter trailing bubble are higher than the former at a certain gas velocity. The volumetric mass transfer coefficient (K L a) is obtained by measuring the bubble volume during the rising process using chemical absorption of carbon dioxide (CO 2 ) with sodium hydroxide (NaOH). Increasing gas velocity, decreasing orifice diameter and bubble inrush make an apparent positive impact on the K L a.CONCLUSIONS: The bubble inrush happens at micrometer orifice. Decreasing orifice diameter and increasing gas velocity are important to intensify oscillation of the leading bubble and increase the frequency of bubbles with high specific interfacial area, which are conducive to the enhancement of the volumetric mass transfer coefficient.

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Diluted alcohol solutions in bubble columns and draft tube airlift reactors with a single orifice sparger: experiments and simple correlations

Cited by 14 publications

References 16 publications

An experimental study of gas void fraction in dilute alcohol solutions in annular gap bubble columns using a four-point conductivity probe

An experimental study of gas void fraction in dilute alcohol solutions in annular gap bubble columns using a four-point conductivity probe

Influence of the Sparger Type and Added Alcohol on the Gas Holdup of an External‐Loop Airlift Reactor

Bubble dynamics and mass transfer characteristics from an immersed orifice plate

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