Optical tomography: Velocity profile measurement using orthogonal and rectilinear arrangements

Rahim, Ruzairi Abdul; Yunos, Yusri Mohd; Rahiman, Mohd Hafiz Fazalul; Muji, Siti Zarina Mohd; Thiam, Chiam Kok; Rahim, Herlina Abdul

doi:10.1016/j.flowmeasinst.2011.10.006

Cited by 15 publications

(3 citation statements)

References 6 publications

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“…Two sources of gamma radiation (2), placed at distance L = 97 mm, emit γ -radiation beams (5) shaped by collimators (1). Photons pass through liquid-gas mixture in the pipeline (5). Two scintillation probes (4) are equipped with collimators (3).…”

Section: Experimental Installation and Measurement Principlementioning

confidence: 99%

“…For this reason, experimental research and development of existing and new methods are highly desirable. Currently, measurements of liquid-gas flows can be performed using tomographic methods (resistivity, optical, capacitance, X-ray and γ-ray tomography) [1][2][3][4][5][6], Coriolis flow meters, Particle Image Velocimetry (PIV), Laser Doppler Anemometry (LDA), high-speed cameras, magnetic resonance imaging and radioisotope methods [7][8][9][10]. The latter, especially the γ-ray absorption method, are also utilised by the authors of this paper in the evaluation of two-phase liquid-solids and liquid-gas flows [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Metrology and Measurement Systems

Hanus,

Zych,

Mosorov

et al. 2020

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Liquid-gas flows in pipelines appear in many industrial processes, e.g. in the nuclear, mining, and oil industry. The gamma-absorption technique is one of the methods that can be successfully applied to study such flows.This paper presents the use of the gamma-absorption method to determine the water-air flow parameters in a horizontal pipeline. Three flow types were studied in this work: plug, transitional plug-bubble, and bubble one. In the research, a radiometric set consisting of two Am-241 sources and two NaI(TI) scintillation detectors have been applied. Based on the analysis of the signals from both scintillation detectors, the gas phase velocity was calculated using the cross-correlation method (CCM). The signal from one detector was used to determine the void fraction and to recognise the flow regime. In the latter case, a Multi-Layer Perceptron-type artificial neural network (ANN) was applied. To reduce the number of signal features, the principal component analysis (PCA) was used. The expanded uncertainties of gas velocity and void fraction obtained for the flow types studied in this paper did not exceed 4.3% and 7.4% respectively. All three types of analyzed flows were recognised with 100% accuracy. Results of the experiments confirm the usefulness of the gamma-ray absorption method in combination with radiometric signal analysis by CCM and ANN with PCA for comprehensive analysis of liquid-gas flow in the pipeline.

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Section: Experimental Installation and Measurement Principlementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Metrology and Measurement Systems

Hanus,

Zych,

Mosorov

et al. 2020

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show abstract

“…The advanced measurement technologies of multiphase flows include tomographic methods: electrical ones (capacitance, resistance, impedance), which use the absorption of X-rays and gamma rays, nuclear magnetic resonance (NMR) and optical ones (e.g. PIV-particle image velocimetry) (Mosorov 2006a;Powell 2008;Falcone et al 2009;Rząsa 2009;Rahim et al 2012;Xue et al 2012;Tamburini et al 2013;Banasiak et al 2014;de Oliveira et al 2015;Kanizawa and Ribatski 2016;Ameran et al 2017;Vlasak et al 2017). Tomographic methods are also used to establish crucial petrophysical parameters of rocks, such as porosity and permeability (Krakowska and Puskarczyk 2015;Jarzyna et al 2016;Kundu et al 2017).…”

Section: Introductionmentioning

confidence: 99%

An analysis and interpretation of the signals in gamma-absorption measurements of liquid–gas intermittent flow

Zych

2018

Acta Geophys.

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The intermittent flow (slug and plug type) of liquid-gas mixtures in a horizontal pipeline measured by the specific radiometric apparatus is presented. The measurement system consists of two sources of Am-241 gamma radiation and two scintillation probes. An analysis of the signals measured by the radiometric equipment is performed in the domain of time and of frequency. Recognised signal parameters are directly referred to physical quantities associated with a liquid-gas flow. The employed methodology enables determination of gas-phase flow velocity and estimation of the average depth and length of bubble gas structures. In the paper, the processing and interpretation results of the selected experiment are presented to show the in-depth description of gas structures and the type of flows recognition.

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