A study on the relationship between upstream and downstream conditions in swirling two-phase flow

Sahovic, B.; Atmani, Hanane; Wiedemann, Philipp; Schleicher, Eckhard; Legendre, Dominique; Climent, Éric; Zamanski, R.; Pedrono, Annaig; Hampel, Uwe

doi:10.1016/j.flowmeasinst.2020.101767

Cited by 9 publications

(4 citation statements)

References 7 publications

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“…Nevertheless, under certain conditions the cutting procedure presents a simple alternative that is very likely available in most post-processing algorithms of researchers in this field. However, recent findings [ 9 , 18 , 19 ] emphasize the need for accounting for negative void fractions from an electrical point of view and advise against using the general cutting procedure. However, since negative void fractions can result from temperature effects also, temperature compensation becomes extremely important.…”

Section: Resultsmentioning

confidence: 99%

“…For flows with high dispersion levels, i.e., the interfacial structures are smaller than the spatial resolution of the sensor, e.g., in dispersed bubbly flow, other normalization approaches such as the Maxwell model are more suitable than the linear one, cf. [ 9 , 18 , 19 ]. Regardless of the model for phase fraction calculation, a single-phase reference matrix

is needed to eliminate the influence of the geometry factors in the two-phase measurement matrix

.…”

Section: Theorymentioning

confidence: 99%

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Temperature Compensation for Conductivity-Based Phase Fraction Measurements with Wire-Mesh Sensors in Gas-Liquid Flows of Dilute Aqueous Solutions

Wiedemann

Dias

Schleicher

et al. 2020

Sensors

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Wire-mesh sensors are well-established scientific instruments for measuring the spatio-temporal phase distribution of two-phase flows based on different electrical conductivities of the phases. Presently, these instruments are also applied in industrial processes and need to cope with dynamic operating conditions increasingly. However, since the quantification of phase fractions is achieved by normalizing signals with respect to a separately recorded reference measurement, the results are sensitive to temperature differences in any application. Therefore, the present study aims at proposing a method to compensate temperature effects in the data processing procedure. Firstly, a general approach is theoretically derived from the underlying measurement principle and compensation procedures for the electrical conductivity from literature models. Additionally, a novel semi-empirical model is developed on the basis of electrochemical fundamentals. Experimental investigations are performed using a single-phase water loop with adjustable fluid temperature in order to verify the theoretical approach for wire-mesh sensor applications and to compare the different compensation models by means of real data. Finally, the preferred model is used to demonstrate the effect of temperature compensation with selected sets of experimental two-phase data from a previous study. The results are discussed in detail and show that temperature effects need to be handled carefully—not merely in industrial applications, but particularly in laboratory experiments.

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Section: Resultsmentioning

confidence: 99%

is needed to eliminate the influence of the geometry factors in the two-phase measurement matrix

.…”

Section: Theorymentioning

confidence: 99%

Temperature Compensation for Conductivity-Based Phase Fraction Measurements with Wire-Mesh Sensors in Gas-Liquid Flows of Dilute Aqueous Solutions

Wiedemann

Dias

Schleicher

et al. 2020

Sensors

Self Cite

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“…Closing the problem of correcting each interface point based on Equations ( 10), ( 11), ( 14), (17), and (18), where the angles are calculated departing from φ 1 , obtained via Equation ( 18), φ 2 via Equation (10), φ 3 via Equation ( 14), φ 4 via Equation (11) and, finally, x real via Equation (17). Now that the upper and lower boundaries of the gas core (represented as red in Figure 11c) are corrected for every single column of pixels along with an image, the local core diameter (for one column of pixels) can be calculated assuming that the gas core at the location forms a perfect disk, with its diameter given by the distance between the 2 points.…”

Section: Refraction Correctionmentioning

confidence: 99%

“…When a mixture of two phases of different densities is pushed through the swirl element, angular velocity is created, and centrifugal forces take place, forcing the phase with higher density toward the pipe wall and creating a core structure with the less dense medium in the center [17]. The efficiency of the separation is determined by the location of the fluids (phases) at the entrance of the two outlet ducts [18].…”

Section: Introductionmentioning

confidence: 99%

Electrical Resistance Tomography for Control Applications: Quantitative Study of the Gas-Liquid Distribution inside A Cyclone

Sattar

Garcia

Banasiak

et al. 2020

Sensors

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Phase separation based centrifugal forces is effective, and thus widely explored by the process industry. In an inline swirl separator, a core of the light phase is formed in the center of the device and captured further downstream. Given the inlet conditions, this gas core created varies in shape and size. To predict the separation behavior and control the process in an optimal way, the gas core diameter should be measured with the minimum possible intrusiveness. Process tomography techniques such as electrical resistance tomography (ERT) allows us to measure the gas core diameter in a fast and non-intrusive way. Due to the soft-field nature and ill-posed problem in solving the inverse problem, especially in the area of low spatial resolution, the reconstructed images often overestimate the diameter of the object under consideration leading to unreliable measurements. To use ERT measurements as an input for the controller, the estimated diameters should be corrected based on secondary measurements, e.g., optical techniques such as high-speed cameras. In this context, image processing and image analysis techniques were adapted to compare the diameter calculated by an ERT system and a fast camera. In this paper, a correction method is introduced to correct the diameter obtained by ERT based on static measurements. The proposed method reduced the ERT error of dynamic measurements of the gas core size from over 300% to below 20%, making it a reliable sensing technique for controlled separation processes.

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Two-phase flow pattern identification in horizontal gas–liquid swirling pipe flow by machine learning method

Jiang

et al. 2023

Annals of Nuclear Energy

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A study on the relationship between upstream and downstream conditions in swirling two-phase flow

Cited by 9 publications

References 7 publications

Temperature Compensation for Conductivity-Based Phase Fraction Measurements with Wire-Mesh Sensors in Gas-Liquid Flows of Dilute Aqueous Solutions

Temperature Compensation for Conductivity-Based Phase Fraction Measurements with Wire-Mesh Sensors in Gas-Liquid Flows of Dilute Aqueous Solutions

Electrical Resistance Tomography for Control Applications: Quantitative Study of the Gas-Liquid Distribution inside A Cyclone

Two-phase flow pattern identification in horizontal gas–liquid swirling pipe flow by machine learning method

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