Experimental study of interfacial characteristics of vertical upward air-water two-phase flow in 25.4 mm ID round pipe

Dang, Zhuoran; Wang, Guanyi; Ju, Peng; Yang, Xiaohong; Bean, Robert; Ishii, Mamoru; Bajorek, Stephen M.; Bernard, Matthew

doi:10.1016/j.ijheatmasstransfer.2017.01.040

Cited by 44 publications

(11 citation statements)

References 23 publications

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“…As the flow develops, the distributions change to core-peaked. It indicates that small bubbles become larger and migrate to the center due to the net transverse forces including shear-induced lift force and wall lubrication force, as mentioned in the previous researches [3,4,6] The increase of bubble size along the flow direction is mainly due to three reasons [15]: small bubble expanses due to the pressure change, the advection effect caused by the bubble velocity change, and the bubble interactions. From the bubble velocity result, the aforementioned advection effect does not attribute to the increase of bubble void fraction or bubble size in these flow conditions as bubble velocity increases along the flow direction.…”

Section: Experimental Results Of Two-phase Profilementioning

confidence: 76%

Interfacial Characteristics at Bubbly to Slug Transition Flow in a Small Diameter Pipe

Wang

Zhang

Ishii

2019

ICONE

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Section: Experimental Results Of Two-phase Profilementioning

confidence: 76%

Interfacial Characteristics at Bubbly to Slug Transition Flow in a Small Diameter Pipe

Wang

Zhang

Ishii

2019

ICONE

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“…The nature of flow regimes and the liquid fraction distribution gotten from upward and downward flows are expected to be significantly dissimilar, which has been confirmed by the conclusions of [14,15]. They concluded that the liquid fraction is presumed to be affected by the flow direction, buoyancy, and gravity force.…”

Section: Gas-liquid Upward and Downward Flowsmentioning

confidence: 76%

Investigating the Behaviour of Air–Water Upward and Downward Flows: Are You Seeing What I Am Seeing?

et al. 2021

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Understanding the behaviour of gas–liquid flows in upward and downward pipe configurations in chemical, petroleum, and nuclear industries is vital when optimal design, operation, production, and safety are of paramount concern. Unfortunately, the information concerning the behaviour of such flows in large pipe diameters is rare. This article aims to bridge that gap by reporting air–water upward and downward flows in 127 mm internal diameter pipes using advanced conductance ring probes located at two measurement locations. The liquid and gas flow rates are 0.021 to 0.33 m/s and 3.52 to 16.1 m/s, correspondingly, covering churn and annular flows. To achieve the desired objectives, several parameters, probability density function (PDF), power spectral density (PSD), Slippage Number (SN), drift velocity (Ugd), and distribution coefficient (C0) were employed. The flow regimes encountered in the two pipe configurations were distinguished employing a flow regime map available in the literature and statistical analysis. The obtained results were supported by visual inspection. The comparison between the present study against reported studies reveals the same tendency for the measured experimental data. The Root Mean Square Error (RMSE) method within 4% was utilized in recommending the best void fraction prediction correlation for the downward and upward flows.

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“…The results of these calculations are presented in Figures. 14-17, which provide a graphical interpretation of Equations ( 14)- (17). According to the authors, their placement The considerable level of the conformity between the results of the calculations and experimental data encouraged the authors to undertake a study into how the variations in viscosity along the flow path affect individual values.…”

Section: New Equations For Liquid Filmsmentioning

confidence: 99%

“…According to the authors, their placement The considerable level of the conformity between the results of the calculations and experimental data encouraged the authors to undertake a study into how the variations in viscosity along the flow path affect individual values. The results of these calculations are presented in Figures 14-17, which provide a graphical interpretation of Equations ( 14)- (17). According to the authors, their placement in the paper allows for qualitative assessment of the influence of selected quantities on the characteristic parameters of the wavy liquid film at the flow with the gaseous phase.…”

Section: New Equations For Liquid Filmsmentioning

confidence: 99%

“…A majority of works have included research into the structures that accompany this type of flow. These include the work of Dang et al [17], in which two-phase flow maps were developed as part of the research. Using a conductivity probe, they determined the phase volume ratios, interfacial surface, bubble velocity and the Sauter mean diameter in a 25.4 mm diameter pipe.…”

Section: Introductionmentioning

confidence: 99%

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Hydrodynamics of Two-Phase Gas-Very Viscous Liquid Flow in Heat Exchange Conditions

Czernek

Witczak

2020

Energies

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This paper presents the results of analyses of the impact of heat transfer conditions on the hydrodynamics of downward co-current annular flow in vertical tubes of very viscous liquid and gas. The research was conducted within the range of gas velocities of 0–30.0 m/s and liquid velocities of 0.001–0.254 m/s, while the viscosity was in the unprecedented range of 0.046–3.5 Pas. The research demonstrates that the volume and nature of the liquid waves with various amplitudes and frequencies arising on the surface of the film are relative to the flow rate and viscosity of the gas phase. At the same time, we found that, under the condition of liquid cooling, an increase in viscosity resulted in the formation of a smooth interface whereas, under the conditions where the liquid is heated at the end of the channel section, a greater number of capillary waves were formed. This research resulted in the development of new dependencies which take into account the influence of selected thermal and flow parameters (including mass fraction) on the values of volumes specific to very viscous liquid film flows. These dependencies improve the accuracy of calculation by 8–10% and are fully applicable to the description of the performance of an apparatus with a hydraulically generated liquid film.

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Experimental study of interfacial characteristics of vertical upward air-water two-phase flow in 25.4 mm ID round pipe

Cited by 44 publications

References 23 publications

Interfacial Characteristics at Bubbly to Slug Transition Flow in a Small Diameter Pipe

Interfacial Characteristics at Bubbly to Slug Transition Flow in a Small Diameter Pipe

Investigating the Behaviour of Air–Water Upward and Downward Flows: Are You Seeing What I Am Seeing?

Hydrodynamics of Two-Phase Gas-Very Viscous Liquid Flow in Heat Exchange Conditions

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