A new database on the evolution of air–water flows along a large vertical pipe

Lucas, Dirk; Beyer, Matthias; Szalinski, L.; Schütz, P.

doi:10.1016/j.ijthermalsci.2009.11.008

Cited by 58 publications

(22 citation statements)

References 19 publications

(30 reference statements)

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“…For small bubbles this may cause that the maximum grey values inside the bubble are rather small. Such small bubbles vanish completely if the threshold is larger than this First the noisy data set is smoothed using an average box filter with a size of [5,5,5]. A new 3D matrix with the same dimensions as the matrix containing the grey values (108 Â 108 Â 25.000) is initialized.…”

Section: Description Of the Algorithmmentioning

confidence: 99%

A new algorithm for segmentation of ultrafast X-ray tomographed gas–liquid flows

Banowski

Lucas

Szalinski

2015

International Journal of Thermal Sciences

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Section: Description Of the Algorithmmentioning

confidence: 99%

A new algorithm for segmentation of ultrafast X-ray tomographed gas–liquid flows

Banowski

Lucas

Szalinski

2015

International Journal of Thermal Sciences

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“…Although many studies have contributed to the topic of the large-diameter vertical pipes (Hills, 1976(Hills, , 1993Shipley, 1984;Hirao et al, 1986;Ohnuki and Akimoto, 1996;Hasanein et al, 1997;Cheng et al, 1998;Ohnuki and Akimoto, 2000;Shoukri et al, 2000;Prasser et al, 2002;Sun et al, 2002;Oddie et al, 2003;Hibiki and Ishii, 2003;Shen et al, 2005;Prasser et al, 2005;Omebere-Iyari et al, 2007Schlegel et al, 2009;Lucas et al, 2010;Shen et al, 2012), a majority of the work performed was restricted to pipe diameter of intermediate sizes (D 200 mm) because this was considered to be an optimum choice from a cost analysis point of view. Only a few studies have been conducted for very large-diameter sizes (300 <D < 500 mm) (Shipley, 1984;Ohnuki and Akimoto, 1996;Hasanein et al, 1997;Yoneda et al, 2002).…”

Section: Review Of Other Large-diameter Vertical Upflow Workmentioning

confidence: 99%

“…In most of the above works with the exception of Cheng et al (1998); Prasser et al (2002); Omebere-Iyari et al (2007; and Schlegel et al (2009), the major multiphase flow parameter, i.e., flow patterns, was studied by flow visualization only and hence can be subjective (Hills, 1976;Shoukri et al, 2000;Ohnuki and Akimoto, 2000;Oddie et al, 2003;Shen et al, 2005Shen et al, , 2012. Additionally, in some of the other large-diameter work, flow patterns were vaguely dealt or completely ignored (Shipley, 1984;Van der Welle, 1985;Clark and Flemmer, 1986;Hirao et al, 1986), while in others the objective of the study was determination of a local flow structure, i.e., local void phase and velocity distributions (Ohnuki and Akimoto, 2000;Shoukri et al, 2000;Prasser et al, 2005;Shen et al, 2005;Prasser, 2007;Prasser et al, 2007;Shen et al, 2012;Schlegel et al, 2009;Lucas et al, 2010); hence any comparison performed with smaller diameter pipes was limited to these parameters only. Moreover, …”

Section: Review Of Other Large-diameter Vertical Upflow Workmentioning

confidence: 99%

Experimental Study of Two-Phase Air–Water Flow in Large-Diameter Vertical Pipes

Ali

Yeung

2015

Chemical Engineering Communications

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Recently, due to an increase in production demand in nuclear and oil and gas industries, the requirement to migrate toward larger pipe sizes for future developments has become essential. However, it is interesting to note that almost all the research on two-phase gas-liquid flow in vertical pipe upflow is based on small-diameter pipes (D 100 mm), and the experimental work on the two-phase gas-liquid flow in large-diameter (D > 100 mm) vertical pipes is scarce. Under the above circumstances, the application of modeling tools=correlations based on small-diameter pipes in predicting flow behavior (flow pattern, void fraction, and pressure gradient) poses severe challenges in terms of accuracy. The results presented in this article are motivated by the need to introduce the research work done to the industries where the data pertaining to large-diameter vertical pipes are scarce and there is a lack of understanding of two-phase gas-liquid flow behavior in large-diameter (D > 100 mm) vertical pipes.The unique aspect of the results presented here is that the experimental data have been generated for a 254-mm inner diameter vertical pipe that forms an excellent basis for the assessment of modeling tools=correlations. This article (i) presents the results of a systematic investigation of the flow patterns in large-diameter vertical pipes and identifies the transition between subsequent flow patterns, (ii) compares it directly with the existing large-(150 mm) and small-diameter data (28 mm and 32 mm) in the same airwater superficial velocity range, (iii) exemplifies that the existing available empirical correlations=models=codes are significantly in error when applied to large-diameter vertical pipes for predictions, and last (iv) assesses the predictive capability of a well-known commercial multiphase flow simulator.

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“…For the coalescence kernels, the models by Coulaloglou and Tavlarides, Prince and Blanch, and Lehr et al are chosen. Numerical results are assessed against experimental data from Lucas et al for air‐water flow in a tall vertical pipe with an inner diameter of 195.3 mm.…”

Section: Introductionmentioning

confidence: 99%

Comparative Analysis of Coalescence and Breakage Kernels in Vertical Gas‐Liquid Flow

et al. 2015

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The evolution of the bubble size distribution is an important consideration in vertical gas-liquid flow especially in determining the appropriate mass, momentum and heat transfer between two phases.In order to adequately capture the distribution and to account for its effect on the local hydrodynamics, which generally represents the dominant flow characteristic in such practical system, a numerical assessment has been performed to understand the six widely adopted different bubble coalescence and bubble breakage kernels. Three different breakage kernels have been selected where each kernel considers a different shape of the daughter size distribution of the bubbles such as the U-shape, bell-shape and M-shape. These are combined with different coalescence kernels. The bubble size distribution, void fraction, interfacial area concentration and gas velocity profiles are compared against the experimental data. Numerical results reveal that the effect on the two-phase flow structure is mainly due to the application of the different breakage kernels. Moreover, the predicted results also show that the bell-shape daughter size distribution favours equal breakage of bubbles; which could lead to the over-prediction of large bubbles. A more sophisticated model for handling bubble induced turbulence should nonetheless be applied in future investigations of vertical gas-liquid flow. This article is protected by copyright. All rights reserved

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A new database on the evolution of air–water flows along a large vertical pipe

Cited by 58 publications

References 19 publications

A new algorithm for segmentation of ultrafast X-ray tomographed gas–liquid flows

A new algorithm for segmentation of ultrafast X-ray tomographed gas–liquid flows

Experimental Study of Two-Phase Air–Water Flow in Large-Diameter Vertical Pipes

Comparative Analysis of Coalescence and Breakage Kernels in Vertical Gas‐Liquid Flow

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