The effect of flow patterns on two-phase flow in a junction

Azzopardi, B.J.; Whalley, P.B.

doi:10.1016/0301-9322(82)90020-9

Cited by 134 publications

(50 citation statements)

References 4 publications

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“…Prior to their work, there had been several models available to predict the flow separation at dividing Tjunctions, such as Azzopardi and Whalley [9], Azzopardi [10], Shoham et al [11] and Hwang et al [12], which were basically developed for diameters ranging from 32 mm to 127 mm.…”

Section: Validation Of the Measured Datamentioning

confidence: 99%

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Branching of two-phase flow from a vertical header to horizontal parallel channels

Lee

2009

J Mech Sci Technol

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The objective of the present experimental work is to investigate the two-phase flow distribution from a vertical main to parallel horizontal branches. Both the main and the branches have rectangular cross-sections simulating the header and the channels of the compact heat exchangers for air-conditioning systems. The cross section of the main is 8 mm × 8 mm while that of the parallel branches is 8 mm × 1 mm. Here, the second (downstream) junction was taken as the reference. The effect of the distance between the branches was mainly examined by changing it from 9 mm to 49 mm for the given flow conditions at the inlet of the downstream junction. Air and water were used as the test fluids. The superficial velocity ranges of air and water at the test section inlet were 13.2 -21.4 m/s and 0.08 -0.28 m/s, respectively. When the branch spacing becomes smaller, the fraction of liquid separation through the downstream branch decreases. The trend remains the same over the entire range of the present experiment, i.e., for different values of quality and the mass flow rate at the inlet of the downstream junction. Based on the correlation for single T-junctions, a modified correlation was proposed to take into account the effect of the branch distance in predicting the fraction of liquid separation. The correlation represents the experimental results within the accuracy of ±15 %.

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Section: Validation Of the Measured Datamentioning

confidence: 99%

“…Previously, Azzopardi and Whalley [9] introduced the concept of "zone of influence" and assumed the boundary lines of the liquid and gas flows are the same, i.e., a f = a g .…”

Section: Validation Of the Measured Datamentioning

confidence: 99%

Branching of two-phase flow from a vertical header to horizontal parallel channels

Lee

2009

J Mech Sci Technol

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“…There is consensus within the research community that the main parameters affecting the flow split inside a T-junction are: the geometry (dimensions and orientation of the side arm), inertia differences of the phases, gravity effects, and the flow pattern upstream of the T-junction. [4][5][6] It should be mentioned that the majority of the previous studies considered laboratory test cases of T-junctions without complex pipe networks downstream as encountered in industry and which might represent an additional important source of resistance to the flow changing remarkably the flow split trend inside the junction. Azzopardi & Whalley 4 after studying the effect of the different parameters affecting the flow split inside T-junctions, recommended that two-phase flows should not be passed through T-junctions and manifolds unless a very severe mal-distribution of phases at outlet is tolerated.…”

Section: Introductionmentioning

confidence: 99%

“…[4][5][6] It should be mentioned that the majority of the previous studies considered laboratory test cases of T-junctions without complex pipe networks downstream as encountered in industry and which might represent an additional important source of resistance to the flow changing remarkably the flow split trend inside the junction. Azzopardi & Whalley 4 after studying the effect of the different parameters affecting the flow split inside T-junctions, recommended that two-phase flows should not be passed through T-junctions and manifolds unless a very severe mal-distribution of phases at outlet is tolerated. Azzopardi 7 mentioned the importance of the rest of the system downstream of the T-junction on the multiphase flow split behavior.…”

Section: Introductionmentioning

confidence: 99%

Effects of Geometry, Temperature, and Inlet Conditions on the Flow Split in Spheroids Manifold

Kharoua¹,

Khezzar²

2016

IPCSE

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“…In order to accomplish with the two tasks, it is essential to understand and be able to predict the degree of phase segregation and general flow behavior of the mixture at T-junctions for various operating conditions. The present state of understanding reveals the great complexity of analyzing the segregation phenomena, with the most important parameters being the inlet flow pattern (Azzopardi, 1982), radial void fraction distribution (Azzopardi, 1984) and branchinlet diameter ratio (Charron and Whalley, 1995). Of course, phase-density difference is critical (Issa and Oliveira, 1994).…”

Section: Introductionmentioning

confidence: 99%

Local parameters of air–water two-phase flow at a vertical T-junction

Monrós-Andreu

Martínez‐Cuenca

Torró

et al. 2017

Nuclear Engineering and Design

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Significant experimental work and modeling about vertical T-junction as a phase separator has been done for churn and annular flows, but a survey on the literature reveals a lack of experimental data regarding bubbly flow nor any phenomenological explanation to their behavior. The objective of this work is to extend the understanding of these junctions by obtaining complete datasets, i.e. of both gas and liquid, of the phase splitting process in bubbly flow conditions by means of conductivity needle probes, Laser Doppler anemometry and visual inspection. Measurements and observations of the phase split, as well as the vortex structure in a vertical T-junction with equal pipe diameters (52 mm inner diameter), are reported. Results suggest a relationship between the vortex structure and the efficiency of the junction as phase separator.

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The effect of flow patterns on two-phase flow in a junction

Cited by 134 publications

References 4 publications

Branching of two-phase flow from a vertical header to horizontal parallel channels

Branching of two-phase flow from a vertical header to horizontal parallel channels

Effects of Geometry, Temperature, and Inlet Conditions on the Flow Split in Spheroids Manifold

Local parameters of air–water two-phase flow at a vertical T-junction

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