Measurement of multifractal character of bubble paths using image analysis

Augustyniak, Jakub; Perkowski, Dariusz M.; Mosdorf, Romuald

doi:10.1016/j.icheatmasstransfer.2020.104701

Cited by 9 publications

(9 citation statements)

References 26 publications

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“…Huang et al explored the kinetic behaviors of single bubbles on free liquid surface and on rigid wall surface, and discussed the shape, failure and rebounce of bubbles [15] . Augustyniak et al tested the virtual centroid orbits of bubbles in water flow, and proposed a bubble centroid coordinate algorithm [16] . Liu et al built a theoretical model that can predict the size distribution of all bubbles in a fully grown bubble swarm, and calculated the forming and extincting velocities of the bubble swarm [17] .…”

Section: Introductionmentioning

confidence: 99%

Ascending motion of bottom-blown bubbles in vertical channels

Zhao

Liu

et al. 2023

Preprint

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The gas-liquid two-phase flow is widely applied in engineering. Studying the bubble movement in the liquid phase is valuable for achieving efficient operation of relevant reactors. In this study, the ascending morphology of single-pore bubbles and double-pore bubbles in liquids was photographed by building a visualization experimental setup. Together with MATLAB, the effects of different variables on the ascending of bottom-blown bubbles were analyzed. Experimental results showed the bubble departure diameter was enlarged with the increase of pore inner diameter. At larger pore inner diameter, the bubble orbits were more disorderly, and the ultimate bubble velocity was smaller. At larger gas flow rate, the orbit of single bubbles was closer to a straight line, and the disturbance of double bubbles was intensified, leading to coalescence. The ultimate bubble velocity in water was accelerated with the increase of gas flow rate, and when the number of pores changed, the flow rate was more influential than the pore inner diameter on the ultimate bubble velocity. The centroid orbits of single bubbles were not significantly different between the two liquid-phase conditions, but the swinging amplitude of double bubbles in water was smaller than that in the 0.75% NaCl solution. The horizontal velocities were not significantly different, but the first velocity and ultimate velocity of bubbles at the vertical level in the 0.75% NaCl solution were both larger than those in water. These findings offer basic data for research on bubble strengthening and blending effects in vertical channels.

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Section: Introductionmentioning

confidence: 99%

Ascending motion of bottom-blown bubbles in vertical channels

Zhao

Liu

et al. 2023

Preprint

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“…The characteristics and dynamic behaviors of these bubbles, such as size, speed, trajectory, distribution, collision, rupture, have a significant effect on energy transfer, motion resistance, etc. As a common problem in many fields, the accurate grasp of bubble behavior in liquid directly determines the cognition of related physical phenomena (Augustyniak et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Bubble Trajectory Tracking Based on ORB Algorithm

et al. 2023

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The system of gas-liquid two-phase bubbly flows is widely found in many industrial fields, such as nuclear energy, chemical, petroleum, and refrigeration. Bubbly two-phase flows measuring including detection and tracking affects the specific engineering problem solving to a great extent. The particle tracking velocity (PTV) algorithm is generally used for the tracking of the particles in the flow field. However, it does not take the shape change of particles into account in the process of flow. In this paper, a kind of bubble feature matching method based on ORB algorithm is proposed, and the edge detection method of findContours in OpenCV is used to extract the bubble contour in the image. The proposed algorithm implements the trajectory tracking of the bubbles with shape change when moving up in liquid. The feasibility of bubble trajectory tracking is shown by displaying of different bubble tracks in the plan, 3D plots and contour changing plots.

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“…Moreover, the investigations on bubble departure, interactions between bubble-bubble and bubble coalescence are treated as an introduction to investigations on the greenhouse effect caused by escaping methane bubbles in the oceans [3,4]. There are a lot of papers in which the results of experiments of bubble generation from a single [5][6][7][8][9][10][11] and twin or more needles or orifices [12][13][14][15][16][17][18] were described.…”

mentioning

confidence: 99%

“…The investigations of liquid penetration into the needle or orifice were analysed only for bubbles departed from a single needle. In paper [7,9,10] the chaotic nature of the bubble departure process and bubble trajectories were investigated. In [7] it was shown that the chaotic character of bubbles trajectories is caused by the departed bubble shape and liquid flow generated by the moving bubble in the bubble column.…”

mentioning

confidence: 99%

“…In paper [7,9,10] the chaotic nature of the bubble departure process and bubble trajectories were investigated. In [7] it was shown that the chaotic character of bubbles trajectories is caused by the departed bubble shape and liquid flow generated by the moving bubble in the bubble column. Moreover, two groups of phenomena responsible for the chaotic nature of bubble behaviours (the first group -bubble interface oscillations, liquid flow around the needle and the second group -processes which appear in the gas supply system) are proposed [9,10,11].…”

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confidence: 99%

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A hydrodynamic interaction between gas bubbles departed in liquid and gas supply system

Dzienis

Golak

Konopka

et al. 2023

Preprint

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In the present paper the hydrodynamic interactions between bubble - bubble and bubble-gas supply system to the needle were experimentally and numerically investigated. In an experiment in one of the needles, the air volume flow rate was constant and in the neighbouring needle, it was changed. Despite setting the constant air flow rate supply to the needle, the frequency of bubble departures fluctuated, with a change in the flow rate in the neighbouring needle. In order to identify the occurrence of hydrodynamic interaction the methods of nonlinear data analysis - wavelet analysis and FFT were used. It can be concluded that the synchronised or alternative bubble departures from twin neighbouring needles, (occurring due to hydrodynamic interaction) are possible by modifying the bubble waiting time. Moreover modification of hydrodynamic interaction between bubble – bubble actually bubble – gas supply system can be used to control the bubble departure process.

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Measurement of multifractal character of bubble paths using image analysis

Cited by 9 publications

References 26 publications

Ascending motion of bottom-blown bubbles in vertical channels

Ascending motion of bottom-blown bubbles in vertical channels

Bubble Trajectory Tracking Based on ORB Algorithm

A hydrodynamic interaction between gas bubbles departed in liquid and gas supply system

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