Local Bubble Size Distributions in Agitated Vessel

Laakkonen, Marko; Moilanen, Pasi; Miettinen, Tatu; Saari, Kari; Honkanen, Markus; Saarenrinne, Pentti; Aittamaa, Juhani

doi:10.1205/cherd.04122

Cited by 62 publications

(10 citation statements)

References 17 publications

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“…Auch ist das Sammeln im Trichter nicht unproblematisch und experimentelles Geschick erforderlich . In den vergangenen Jahrzehnten haben zahlreiche Autoren diese Messtechnik erfolgreich eingesetzt und auch mit bildgebenden Verfahren gekoppelt .…”

Section: Messmethodenunclassified

Particle Measurement Techniques in Fluid Process Engineering

Lichti

Bart

2017

Chemie Ingenieur Technik

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Partikuläre Systeme sind ubiquitär und kommen in der Fluidverfahrenstechnik in Form von Tropfen, Blasen oder Feststoffpartikeln vor. Nicht nur ihre Konzentration, sondern auch ihre Verteilung bestimmt oft maßgeblich den jeweiligen Prozess. In diesem Beitrag wird ein Ü berblick über gängige invasive und nichtinvasive Messverfahren zur Erfassung von Blasen und Tropfen vorgestellt. Die Vor-und Nachteile zur Erfassung von Phasen-und Partikelgrößenverteilungen in Mehrphasensystemen werden angesprochen und Funktionsprinzipien, deren Anwendbarkeit im Labor sowie Grenzen im industriellen Einsatz aufgezeigt und diskutiert. Particle Measurement Techniques in Fluid Process EngineeringDroplets, bubbles or solid particles concentration and their particle size distribution markedly influence process conditions. In this article an overview in respect to popular invasive and non-invasive local measurement techniques for bubbles and droplets will be given. It starts with capillary suction probes, laser Doppler anemometry and finally covers actual developments in tomography and optical endoscopic measurement techniques. Furthermore, the possibilities and limitations of analyzing particle size distributions within different methods as well as application fields and their limits will be discussed.

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Section: Messmethodenunclassified

Particle Measurement Techniques in Fluid Process Engineering

Lichti

Bart

2017

Chemie Ingenieur Technik

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“…The embedded m-loops correspond to iterative flux/defect correction for the involved convection-diffusion operators. In the case of an implicit time discretization, subproblem (23)(24) leads to a sequence of algebraic systems of the form [21,23,46] …”

Section: Integration Of Pbe Into Cfdmentioning

confidence: 99%

“…Thus, two more studies are examined: the first example has been taken from the study by [24] for high dissipation rate values, and the latter one has been taken from the study of Olmos and his colleagues [37] for low values of dissipation rate.…”

Section: Validation Problemsmentioning

confidence: 99%

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Numerical aspects and implementation of population balance equations coupled with turbulent fluid dynamics

Bayraktar

Mierka

Platte

et al. 2011

Computers & Chemical Engineering

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“…Both these methods have been extensively reported in the literature -some of the intrusive methods employ capillary suction probes (Laakkonen et al, 2005), conductivity probes (Liu and Bankoff, 1993), optical fiber probes (Saberi et al, 1995) and wire-mesh sensors (Prasser, 2008), etc. The non-intrusive methods include interferometric particle imaging (Glover et al, 1995), laser Doppler velocimetry (Mudde et al, 1998), extinction and scattering activity measurement (Zaidi, 1998), phase Doppler anemometry (Laakkonen et al, 2005) and other particle-imaging techniques (Tayali and Bates, 1990;Adrian, 1991;Grant, 1997), etc. In general, non-intrusive methods are Contents lists available at ScienceDirect journal homepage: www.elsevier.com/locate/ces preferred over intrusive methods which disturb the local flow fields because of the placement of the probes.…”

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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Local Bubble Size Distributions in Agitated Vessel

Cited by 62 publications

References 17 publications

Particle Measurement Techniques in Fluid Process Engineering

Particle Measurement Techniques in Fluid Process Engineering

Numerical aspects and implementation of population balance equations coupled with turbulent fluid dynamics

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

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