Drop behaviour characteristics in different operating regimes in an L‐shaped pulsed sieve‐plate column

Amani, Pouria; Esmaieli, Mohamad

doi:10.1002/cjce.22911

Cited by 8 publications

(2 citation statements)

References 55 publications

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“…The droplet characteristics influence nearly all the relevant parameters that affect hydrodynamics as well as mass transfer in extraction columns. Mean drop size is a crucial parameter that affects the residence time of the dispersed phase, the velocity of the rising drops, and the holdup and maximum volumetric capacity of an extraction process [92].…”

Section: Effect Of Nanoparticles On Droplets Behaviormentioning

confidence: 99%

A critical review on the use of nanoparticles in liquid–liquid extraction

Amani

Ahmadi

et al. 2018

Chemical Engineering Science

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Recently, the use of nanoparticles in extraction columns has gained increasing attention due to their potential to enhance mass transfer processes. Most of the reported work, however, has been concerned with mass transfer enhancement in gas-liquid systems in the presence of nanoparticles, while limited studies of liquid-liquid systems have been reported. Liquidliquid extraction is an extensively employed separation method that has taken on a substantial role in engineering and industrial applications for recovery processes. Therefore, the aim of this review article is to provide an overview of the state-of-the-art from the available literature on the effect of nanoparticles on the hydrodynamic behavior and mass transfer performance of liquid-liquid systems. Attention is also given to providing an understanding of the mechanisms responsible for the improvements in mass transfer with the use of nanoparticles. In the majority of studies, the presence of nanoparticles was found to be beneficial and to lead to improved mass transfer, although a few investigations reported a detrimental impact of nanoparticles. The literature does not clearly describe the conditions under which the addition of nanoparticles would be unfavorable. Moreover, the addition of nanoparticles always introduces potential drawbacks, such as sedimentation, accumulation, or clogging inside extraction columns, as well as the need to separate the nanoparticles at the outlets. These drawbacks have not been considered in the literature, limiting the practical employment of nanoparticles in this industry.

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Section: Effect Of Nanoparticles On Droplets Behaviormentioning

confidence: 99%

A critical review on the use of nanoparticles in liquid–liquid extraction

Amani

Ahmadi

et al. 2018

Chemical Engineering Science

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“…Combining the experimental and simulation results, a promising analytical method to estimate the bubble shapes by analyzing the characteristics of pre-signals is formulated. The method will further provide an experimental and theoretical basis for the establishment of bubble movement in real industrial applications, such as wastewater treatment [23,24] and pharmaceutical engineering [25].…”

Section: Introductionmentioning

confidence: 99%

Influence of Bubble Deformation on the Signal Characteristics Generated Using an Optical Fiber Gas–liquid Two-Phase Flow Sensor

Zhang

Song

et al. 2021

Sensors

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The use of optical fiber probe in two-phase flow measurements is very frequently encountered, especially in the applications of chemical engineering and petroleum industries. In this work, the influence of bubble piercing signals caused by bubble deformation is studied experimentally using a laboratory-prepared wedge-shaped fiber probe in a lab-scale gas–liquid flow generator. A three-dimensional simulation model is established to study the influence of bubble deformation on the piercing signals. A theoretical analysis of the characteristics of the pre-signal influenced by the bubble deformations is undertaken for a wide range of different modeled bubble shapes. Combining the experimental and simulation results, a promising analytical method to estimate the bubble shapes by analyzing the characteristics of pre-signals is proposed. The results of this investigation demonstrate that it is possible to estimate the bubble shapes before the fiber probe contacts the bubble surface. The method developed in this investigation is therefore highly promising for reducing errors caused by deformation during the probe piercing process.

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Study of holdup and slip velocity in an L-shaped pulsed sieve-plate extraction column

et al. 2019

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High-end applications require a very tall vertical extraction column in some cases which deteriorates protection against radiation and cannot be employed for indoor applications. On the other hand, horizontal extraction columns offer higher efficiency and pretension, but lower maximum throughput. In order to address this issue, the L-shaped pulsed extraction column is a new type of extractors which were recently introduced for such applications with area constraints. The objective of this study is to evaluate the effects of operating parameters and physical properties on the variation of holdup and slip velocity in this type of extractors for three liquid systems including toluene-water, butyl acetate-water and n butanol-water without and under mass transfer condition. A comprehensive investigation on the determination of predictive ability of available correlations for the holdup and slip velocity in pulsed plate columns has been conducted. Finally, new correlations are proposed for prediction of these parameters regarding operational conditions and physical properties. Keywords L-shaped pulsed plate column • Slip velocity • Holdup • Pulsation intensity • Mass transfer List of symbols A Amplitude of pulsation, m Af Pulsation intensity, m/s D Column diameter, m d Hole diameter, m f Frequency of pulsation, Hz g Acceleration due to gravity, = 9.81 m/s 2 h Plate spacing, m H Column length, m Q Volumetric flow rate, m 3 /s V c Superficial velocity of continuous phase, m/s V d Superficial velocity of dispersed phase, m/s V s Slip velocity, m/s Greek symbols Fractional free area Holdup Viscosity, N s/m 2 Density, kg/m 3 Δ Density difference between two phases, kg/m 3 Interfacial tension between two phases, N/m * Jaber Safdari

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Drop behaviour characteristics in different operating regimes in an L‐shaped pulsed sieve‐plate column

Cited by 8 publications

References 55 publications

A critical review on the use of nanoparticles in liquid–liquid extraction

A critical review on the use of nanoparticles in liquid–liquid extraction

Influence of Bubble Deformation on the Signal Characteristics Generated Using an Optical Fiber Gas–liquid Two-Phase Flow Sensor

Study of holdup and slip velocity in an L-shaped pulsed sieve-plate extraction column

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