Disturbance wave development in two-phase gas–liquid upwards vertical annular flow

Zhao, Yujie; Markides, Christos N.; Matar, Omar; Hewitt, Geoffrey F.

doi:10.1016/j.ijmultiphaseflow.2013.04.001

Cited by 146 publications

(93 citation statements)

References 45 publications

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“…As a result, the transverse coherence is regained gradually. This is in agreement to the observations of the paper [1], though further downstream this increase may also occur due to coalescence of narrower disturbance waves to form wider waves, as it was noticed in [4]. Fig.…”

Section: Resultssupporting

confidence: 92%

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Three-dimensional investigation of liquid film structure at the initial area of annular-dispersed flow

Алексеенко

Cherdantsev

et al. 2016

MATEC Web Conf.

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Abstract. Initial stage of downward flow of gas-sheared liquid film in a vertical rectangular duct was studied using brightness-based laser-induced fluorescence technique. Measurements were resolved along both longitudinal and transverse coordinates and time. The initial highfrequency waves which are formed at the inlet were found to be two-dimensional. These waves are promptly broken into localised horseshoe-shaped waves which merge downstream to form large-scale quasi-2D disturbance waves. Peculiarities of three-dimensional evolution of waves of different types were studied in a wide range of flow parameters.

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Section: Resultssupporting

confidence: 92%

“…Experiments by local conductivity probes showed that near the inlet film surface is covered by high-frequency small-amplitude waves [1]. In recent paper [2] spatiotemporal evolution of waves in one longitudinal section of 15 mm pipe was studied near the inlet using laser-induced fluorescence technique.…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional investigation of liquid film structure at the initial area of annular-dispersed flow

Алексеенко

Cherdantsev

et al. 2016

MATEC Web Conf.

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show abstract

“…These optical methods have gained popularity, thanks to several advantages that they offer compared to more classical techniques for multiphase flow measurement and characterization, such as hot-wire/hot-film anemometry (Ueda and Tanaka 1975;Majithia et al 2008), parallel/twin-wire, or conductivity probes (Han et al 2006;Zhao et al 2013). In particular, optical techniques: (i) can provide both qualitative and detailed high-resolution quantitative information on important flow phenomena and quantities; and (ii) are non-intrusive, so that these flow characteristics can be measured without introducing external disturbances to the flow.…”

Section: Introductionmentioning

confidence: 99%

A review of solid–fluid selection options for optical-based measurements in single-phase liquid, two-phase liquid–liquid and multiphase solid–liquid flows

2017

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Experimental techniques based on optical measurement principles have experienced significant growth in recent decades. They are able to provide detailed information with high-spatiotemporal resolution on important scalar (e.g., temperature, concentration, and phase) and vector (e.g., velocity) fields in single-phase or multiphase flows, as well as interfacial characteristics in the latter, which has been instrumental to step-changes in our fundamental understanding of these flows, and the development and validation of advanced models with ever-improving predictive accuracy and reliability. Relevant techniques rely upon well-established optical methods such as direct photography, laser-induced fluorescence, laser Doppler velocimetry/phase Doppler anemometry, particle image/tracking velocimetry, and variants thereof. The accuracy of the resulting data depends on numerous factors including, importantly, the refractive indices of the solids and liquids used. The best results are obtained when the observational materials have closely matched refractive indices, including test-section walls, liquid phases, and any suspended particles. This paper reviews solid–liquid and solid–liquid–liquid refractive-index-matched systems employed in different fields, e.g., multiphase flows, turbomachinery, bio-fluid flows, with an emphasis on liquid–liquid systems. The refractive indices of various aqueous and organic phases found in the literature span the range 1.330–1.620 and 1.251–1.637, respectively, allowing the identification of appropriate combinations to match selected transparent or translucent plastics/polymers, glasses, or custom materials in single-phase liquid or multiphase liquid–liquid flow systems. In addition, the refractive indices of fluids can be further tuned with the use of additives, which also allows for the matching of important flow similarity parameters such as density and viscosity

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“…29 2.2 Representação do cálculo de frequência mediante a contagem de ondas de grande amplitude em um determinado intervalo de tempo 36 2.3 Espectro de frequências e PSD para um sinal temporal de altura do filme 37 2.4 Ilustração de uma correlação cruzada aplicada para uma série temporal 38 2.5 Velocidade da onda em função da distância entre as sondas. 5.1 Velocidades superficiais criticas de líquido e gás (Zhao et al, 2013). 63 5.2 Velocidades superficiais criticas de líquido e gás (Kaji, 2008).…”

Section: Eric Mauricio González Fontalvounclassified

“…63 5.2 Velocidades superficiais criticas de líquido e gás (Kaji, 2008). 63 5.3 Limite entre bem/mal posto para Modelo 1 variando D L (Zhao et al, 2013) 65 5.4 Limite entre bem/mal posto para Modelo 3 (Zhao et al, 2013) 66 5.5 Limite entre bem/mal posto para Modelo 3 (Kaji, 2008) 67 5.6 Teste de malha para Caso A 68 5.7 Teste de malha para Caso B utilizando Modelo 2 e Modelo 3. 69 5.8 Influência do esquema de discretização espacial (1a.…”

Section: Eric Mauricio González Fontalvounclassified

Avaliação Da Pressão Dinâmica No Modelo De Dois Fluidos Unidimensional Aplicado Ao Escoamento Anular Vertical

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Disturbance wave development in two-phase gas–liquid upwards vertical annular flow

Cited by 146 publications

References 45 publications

Three-dimensional investigation of liquid film structure at the initial area of annular-dispersed flow

Three-dimensional investigation of liquid film structure at the initial area of annular-dispersed flow

A review of solid–fluid selection options for optical-based measurements in single-phase liquid, two-phase liquid–liquid and multiphase solid–liquid flows

Avaliação Da Pressão Dinâmica No Modelo De Dois Fluidos Unidimensional Aplicado Ao Escoamento Anular Vertical

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