On the characteristics of the roll waves in gas–liquid stratified-wavy flow: A two-dimensional perspective

Aydın, Taner; Torres, Carlos F.; Karami, Hamidreza; Pereyra, Eduardo; Sarica, Cem

doi:10.1016/j.expthermflusci.2015.02.013

Cited by 20 publications

(2 citation statements)

References 37 publications

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“…The maximum discrepancy between the void fraction measured by WMS and QCV was approximately 5%. Similarly, Aydin et al (2015) compared QCV data and the mean values of the liquid holdup measured over the pipe cross-section using WMS in 152 mm ID horizontal pipes for stratified-wavy and low-liquid loading conditions. The WMS measurements were also in good agreement with QCV values.…”

Section: Measurement Techniquementioning

confidence: 99%

Experimental characterization of vertical downward two-phase annular flows using Wire-Mesh Sensor

Vieira

Parsi

McLaury

et al. 2015

Chemical Engineering Science

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Section: Measurement Techniquementioning

confidence: 99%

Experimental characterization of vertical downward two-phase annular flows using Wire-Mesh Sensor

Vieira

Parsi

McLaury

et al. 2015

Chemical Engineering Science

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“…The phenomenon might occur in dam spillways, in natural flows (geophysical) (Bazargan & Aghebatie, 2015;Arai et al, 2013), in highway traffic (vehicles are treated as fluid particles) (Kuehne, 1984), in gas pipelines (Aydin et. al., 2015) and even in the circulation of human arteries (Brook & Pedley, 2002).…”

Section: Introductionmentioning

confidence: 99%

Roll waves and their generation criteria

Ferreira

Maciel

Pereira

2021

RBRH

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Pulsating waves (also known as roll waves) might occur on the free surface of extreme events like mud and debris flows, among others, usually intensifying the caused damage. This technical note aims to inform about the roll wave phenomenon developing in a free-surface laminar flow, and analyze its generation criteria, centered on the concepts of Froude number and disturbance frequency. The complete linear stability analysis of the new depth-averaged model was proven a useful theoretical tool in determining new generation criteria for roll waves developing in non-Newtonian fluids. The results showed that the roll wave generation depends on two criteria: the first is associated to the minimum Froude number, and the second is related to the cut-off frequency. In addition, we have confirmed that the new generation criteria can be verified via numerical simulation based on a second model with full equations (Fluent software). Globally, the emergence of roll waves is favored by the non-Newtonian properties of the flowing fluid and the fact that the cut-off frequency decreases along with the minimum Froude number. Lastly, both generation criteria were tested in order to examine a case study involving the occurrence of roll waves in a watershed.

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Analysis of roll wave characteristics under low liquid loading two‐phase flow conditions

et al. 2017

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An experimental study is conducted using a 0.152‐m ID facility to investigate the wave characteristics of two‐phase stratified wavy flow in horizontal pipelines. The experiments are conducted under low liquid loading condition, which is very commonly observed in wet gas pipelines. The experiments are conducted with water as the liquid phase, and repeated with 51 wt % of monoethylene glycol (MEG) in the aqueous phase to analyze the effects of MEG presence on wave characteristics. The experimental range of this study covers superficial gas velocity, vSg, values of 9–23 m/s and superficial liquid velocity, vSL, values of 0.01–0.02 m/s. Similar test matrices are completed for the cases with and without MEG in the aqueous phase. A conductivity probe system is used to measure the wave characteristics at the liquid–gas interface. These characteristics include the wave celerity, frequency, amplitude, length, and liquid film thickness. The experimental oil–air wave characteristics data of Gawas et al. (Int J Multiphase Flow. 2014;63:93–104) is also used for comparison purposes. The trends in the resulting wave characteristics with respect to input parameters are investigated, for oil, water, or MEG–water mixture as the liquid phase. Common predictive methods for interfacial wave celerity, including shallow water theory, Watson (Proceedings of the 4th International Conference in Multi‐Phase Flows, Nice, France. 1989:495–512), Paras et al. (Int J Multiphase Flow. 1994;20(5):939–956), Al‐Sarkhi et al. (AIChE J. 2012;58(4):1018–1029), and Gawas et al. (Int J Multiphase Flow. 2014;63:93–104) are evaluated in comparison with the experimental data. The results of the wave frequency correlation of Al‐Sarkhi et al. (AIChE J. 2012;58(4):1018–1029) are also compared with the experimental wave frequency data. Lastly, a correlation is developed to predict the relative wave amplitude, as a function of superficial gas Weber number and liquid velocity number. Most of the commonly used two‐phase stratified flow models are developed with the assumption of steady‐state conditions, and neglect the transient wave effects. This study provides valuable experimental results on wave characteristics of stratified wavy flow for different types of liquid phase. Moreover, a comprehensive analysis of the parameters affecting the wave characteristics of stratified wavy flow is presented. © 2017 American Institute of Chemical Engineers AIChE J, 63: 3177–3186, 2017

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On the characteristics of the roll waves in gas–liquid stratified-wavy flow: A two-dimensional perspective

Cited by 20 publications

References 37 publications

Experimental characterization of vertical downward two-phase annular flows using Wire-Mesh Sensor

Experimental characterization of vertical downward two-phase annular flows using Wire-Mesh Sensor

Roll waves and their generation criteria

Analysis of roll wave characteristics under low liquid loading two‐phase flow conditions

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