Measurement of bubble and pellet size distributions: past and current image analysis technology

Junker, Beth

doi:10.1007/s00449-006-0070-3

Cited by 58 publications

(58 citation statements)

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“…Use of technical vision systems in mining industry allows to carry out visual separation of ores, microscopic estimation of minerals, optical measurement of various objects sizes and solve other tasks. Great interest to such systems is confirmed by a considerable number of publications devoted to their development and implementation [1][2][3][4][5][6][7]. The present article represents results of industrial tests of programmed equipment complex "Granics" designed to determine distribution of geometrical sizes of crushed, palletized or granulated flowing material.…”

Section: Introductionmentioning

confidence: 96%

Industrial Tests Of Programmed Equipment Complex “Granics” Performed In The Facilities Of Erdenet Mining Corporation, Mongolia

Krouglov¹

2015

Proceedings of the 2015 International Conference on Electrical, Automation and Mechanical Engineering

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Section: Introductionmentioning

confidence: 96%

Industrial Tests Of Programmed Equipment Complex “Granics” Performed In The Facilities Of Erdenet Mining Corporation, Mongolia

Krouglov¹

2015

Proceedings of the 2015 International Conference on Electrical, Automation and Mechanical Engineering

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“…Similarly, in many liquid-gas systems, gases are dispersed in liquids to obtain large interfacial area available for chemical reactions, heat and mass transfer processes. The rate of such processes is characterized by bubble surface area flux which is closely associated with the bubble size distribution (Junker, 2006). Different techniques have been employed to measure bubble size distributions.…”

Section: Introductionmentioning

confidence: 99%

An integrative image measurement technique for dense bubbly flows with a wide size distribution

Karn

Ellis

Arndt

et al. 2015

Chemical Engineering Science

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A robust image analysis approach for highly turbulent bubbly flows is proposed. It can resolve both in-focus and out-of focus bubbles over a wide size range. It can segment individual bubble from large clusters in high void fraction images. The approach was validated using both synthetic bubble images and experimental data. It allows real time analysis of two-phase flows in many industrial applications. a b s t r a c tThe measurements of bubble size distribution are ubiquitous in many industrial applications in chemical engineering. The conventional methods using image analysis to measure bubble size are limited in their robustness and applicability in highly turbulent bubbly flows. These flows usually impose significant challenges for image processing such as a wide range of bubble size distribution, spatial and temporal inhomogeneity of image background including in-focus and out-of-focus bubbles, as well as the excessive presence of bubble clusters. This article introduces a multi-level image analysis approach to detect a wide size range of bubbles and resolve bubble clusters from images obtained in a turbulent bubbly wake of a ventilated hydrofoil. The proposed approach was implemented to derive bubble size and air ventilation rate from the synthetic images and the experiments, respectively. The results show a great promise in its applicability for online monitoring of bubbly flows in a number of industrial applications.

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“…13 Similarly, in many liquid-gas systems, gases are dispersed in liquids to obtain large interfacial area for chemical reactions, heat and mass transfer processes. The rate of these processes is determined by bubble surface area flux which is closely linked to the bubble size distribution.…”

Section: Introductionmentioning

confidence: 99%

Untitled

2017

IPCSE

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Abbreviations BSD, bubble size distribution; PET, positron emission tomography; PIV, particle image velocimetry, RPT; radioactive particle tracking; NMR, nuclear magnetic resonance imaging IntroductionMultiphase flow systems have been applied extensively in chemical, physical, petrochemical and biochemical processing industries.1-3 Among different multiphase flow systems, bubbly flow is a two phase flow where small bubbles are dispersed or suspended in a liquid continuum. Typical features of this flow are moving and deformable interfaces of bubbles in time and space domains and complex interactions between the interfaces, and also between the bubbles and the liquid flow. Bubbly flows occur frequently in natural systems and are also used for different applications in energy-producing and chemical and petroleum industries. Some of the common applications involve bubble columns which are used as reactors in a variety of chemical and biochemical processes, e.g. the Fischer-Tropsch process for hydrocarbon synthesis, hydrogenation of unsaturated oil, coal liquefaction, fermentation, waste water treatment etc. 4,5 Bubbly flows are also ubiquitously found in flotation cells 6 and spargers 7 and have recently been investigated extensively for aeration studies. [8][9][10][11][12] Concentration, size and velocity distributions of solid or liquid particles suspended in gas or liquid are important in many processes such as meteorological research, biology, environmental protection, chemistry, medicine and agricultural engineering. Further, commercial activities such as conversion of natural gas to fuels and chemicals have prompted further fundamental research in fluid and bubble dynamics, transport phenomena and the effects due to scale up of three-phase fluidization systems.The prediction of pressure drop and wall heat transfer is necessary in many of these processes and these are strongly dependent upon the concentration, morphology and spatial distribution of the bubbles. 13 Similarly, in many liquid-gas systems, gases are dispersed in liquids to obtain large interfacial area for chemical reactions, heat and mass transfer processes. The rate of these processes is determined by bubble surface area flux which is closely linked to the bubble size distribution. 14 DiscussionDifferent techniques have been employed to measure bubble size distributions. Broadly, it can be divided into two categoriesintrusive and non-intrusive techniques.15 Both these methods have been extensively reported in the literature and a brief description of different intrusive and non-intrusive techniques is provided below, Intrusive techniquesConsiderable intrusive techniques have been developed to study bubble behavior in gas-liquid and gas-liquid-solid fluidized systems. These intrusive techniques include impedance (conductivity or resistivity) probes, capillary suction probes, 16 optical fiber probes, ultrasound probes, endoscopic probes, wire-mesh sensors 17 and hot film anemometry.The impedance probe has been applied to measure the bubble volume f...

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Measurement of bubble and pellet size distributions: past and current image analysis technology

Cited by 58 publications

References 99 publications

Industrial Tests Of Programmed Equipment Complex “Granics” Performed In The Facilities Of Erdenet Mining Corporation, Mongolia

Industrial Tests Of Programmed Equipment Complex “Granics” Performed In The Facilities Of Erdenet Mining Corporation, Mongolia

An integrative image measurement technique for dense bubbly flows with a wide size distribution

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