The effect of liquid co-flow on gas fractions, bubble velocities and chord lengths in bubbly flows. Part I: Uniform gas sparging and liquid co-flow

Muilwijk, Corné; Akker, H.E.A. van den

doi:10.1016/j.ijmultiphaseflow.2020.103498

Cited by 7 publications

(3 citation statements)

References 60 publications

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“…Bubble size can be increased through coalescence, in which two or more bubbles come together. There are three mechanisms of bubble coalescence such as bubble coalesce because of turbulence; different bubbles' sizes toward each other, and one of the bubbles being drawn into the wake of a preceding one [7,13]. Buwa and Ranade [14] presented experimental data similar to that of Mudde (1997) et al, [15] on the dynamics of gas-liquid flows using different sprayer configurations and different liquids.…”

Section: ________________________mentioning

confidence: 99%

Effect of Swirl Gas Injection on Bubble Characteristics in a Bubble Column

Demong

Rigit²,

Sanaullah³

2023

ARFMTS

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Swirling gas injection is a well-known technique to improve mass transfer in bubble columns. It can be used to create small bubbles with a high surface area-to-volume ratio, which is beneficial for mass transfer. Swirl gas injection can also be used to create a more uniform bubble size distribution and improve the mixing of gas and liquid in the column. This study aims to determine the impact of swirl gas injection on bubble properties, including bubble shape, size, and velocity. A bubble detection approach has been developed for quick and precise determination of bubble size distributions in gas-liquid systems. Advanced digital image processing, including edge detection and bubble edge recognition, is used in this method. The experiment is conducted in a bubble column at a height of 57 cm and 61 cm. The column had a ring sparger and was made of Plexiglas. Tap water was used as the liquid, while air from an air compressor was utilized as the gas phase. The shape, size, population, and velocity of the bubble are measured using a high-speed digital camera. According to this study, the average bubble size reduced as the impeller speed increased, while the population of bubbles increased when the sparger rotation speed increased from 30 to 150 rpm.

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Section: ________________________mentioning

confidence: 99%

Effect of Swirl Gas Injection on Bubble Characteristics in a Bubble Column

Demong

Rigit²,

Sanaullah³

2023

ARFMTS

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“…In order to better study the bubble morphology and size distribution after bubble cutting, a rectangular MSJBC was made of transparent acrylic material. Rectangular structures were suitable for the lab-scale research and have been used in many researches [27][28][29][30]. When capturing the bubble images with the high-speed camera, rectangular BCs are easier to visually observe and optically measure than cylindrical structures [31] because the curved side walls of the cylindrical structures have a strong divergence effect on laser light.…”

Section: Experimental Devices and Flow Conditionsmentioning

confidence: 99%

“…Its characteristics such as simplicity and physical intuition are attractive in laboratory-scale research. Non-intrusive methods, such as the optical method and acoustic bubble detection method [32], are superior to intrusive ones (e.g., optical fiber probe, conductivity probe and wire mesh sensor), due to (1) the former realizing the combination of PIV technology and visualization observation; (2) bubbles are not idealized rigid spheres, and intrusive measurements are subject to measurement biases [27]; and (3) the latter can disturb the fluid flow when inserted into the column [33]. The bubble information provided by the high-speed camera can be obtained by physical visual observation and post processing technology (PIV).…”

Section: Capture Bubblesmentioning

confidence: 99%

Effect of Different Configurations on Bubble Cutting and Process Intensification in a Micro-Structured Jet Bubble Column Using Digital Image Analysis

et al. 2021

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An experimental study was conducted in this work to investigate the effect of different configurations on bubble cutting and process intensification in a micro-structured jet bubble column (MSJBC). Hydrodynamic parameters, including bubble size, flow field, liquid velocity, gas holdup as well as the interfacial area, were compared and researched for a MSJBC with and without mesh. The bubble dynamics and cutting images were recorded by a non-invasive optical measurement. An advanced particle image velocimetry technique (digital image analysis) was used to investigate the influence of different configurations on the surrounding flow field and liquid velocity. When there was a single mesh and two stages of mesh compared with no mesh, the experimental results showed that the bubble size decreased by 22.7% and 29.7%, the gas holdup increased by 5.7% and 9.7%, and the interfacial area increased by more than 34.8% and 43.5%, respectively. Significant changes in the flow field distribution caused by the intrusive effect of the mesh were observed, resulting in separate liquid circulation patterns near the wire mesh, which could alleviate the liquid back-mixing. The mass transfer experiment results on the chemical absorption of CO2 into NaOH enhanced by a mass transfer process show that the reaction time to equilibrium is greatly reduced in the presence of the mesh in the column.

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