Flow patterns in vertical two-phase flow

McQuillan, K.W.; Whalley, P.B.

doi:10.1016/0301-9322(85)90043-6

Cited by 194 publications

(77 citation statements)

References 8 publications

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“…Examination of the ranges of flow rates used shows that those employed by Lopes and Dukler (1981) and Smith and Lindsted (1985) are close to boundary for annular flow and flow reversal whilst other work is well into annular flow. This difference can best be illustrated by use of the dimensionless gas velocity suggested by Wallis (1961) to describe flooding McQuillan and Whalley (1985) suggest that values of represent annular flow. Hewitt et al(1965) give a range of O.…”

Section: Methods Of Measurementmentioning

confidence: 99%

The Role of Drops in Annular Gas-Liquid Flow: Drop Sizes and Velocities

Azzopardi¹

1988

JAPANESE JOURNAL OF MULTIPHASE FLOW

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Methods of measurement and data obtained for drop sizes and velocity in annular gas/liquid flow have been reviewed. In particular, possible sources of bias of bias in the results have been examined. The interrelation of data from different sources is considered and regions where different behaviour predominates are identified. (Received 15 November 1987) 1. INTRODUCTION The occurrence of annular gas-liquid two-phase flow in many pieces of industrial equipment has resulted in it being the subject of a large number of studies over the last thirty years. Though the liquid film travelling on the channel walls received much early attention, it is only recently that developments in diagnostic equipment has permitted detailed measurement of the properties of the drops carried in the central gas core.Drops are important because they affect pressure drop, heat and mass transfer and processes like erosion, erosion/corrosion and corrosion. One primary effect of the existence of drops is that liquid is removed from the film. In pressure drop the film acts as rough surface over which the gas flows. If not all of the liquid travels in the film, allowance will have to be made for this in calculating the pressure drop. In heated systems, the formation of drops by entrainment or atomisation of liquid can result in the liquid film drying out well before all of the liquid is evaporated. This can occur because the entrainment rate is greater than the accompanying rate of redeposition. Dryout of the film results in a deterioration of heat transfer. In heat flux controlled systems, a sharp increase in wall temperature occurs and the vapour temperature rises above the saturation temperature causing the wall temperature to increase even further so as to maintain the temperature difference. Evaporation of the liquid drops keeps the vapour and wall temperatures down. The degree of temperature reduction depends on the size and velocities of the drops created in the annular flow region of the equipment. In the case of mass transfer, removal of dust or chemical species depends on the size of the drops and the

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Section: Methods Of Measurementmentioning

confidence: 99%

The Role of Drops in Annular Gas-Liquid Flow: Drop Sizes and Velocities

Azzopardi¹

1988

JAPANESE JOURNAL OF MULTIPHASE FLOW

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“…McQuillan and Whalley [115] followed the same approach for predicting the transition between bubble and slug flow regimes. Barnea [116] also followed the same approach and modified the bubble to slug transition model to include pipe inclination.…”

Section: Transition From Bubble To Slug Flow Regimementioning

confidence: 99%

“…McQuillan and Whalley [115] employed the empirically modified model proposed by Taitel and Dukler [121] for horizontal pipes, to predict the bubble to dispersed bubble transition in vertical pipes. It was postulated that at high liquid flow rates, the effect of slip between two phases is negligible and the turbulence is caused only by the bulk flow.…”

Section: Transition From Bubble To Slug Flow Regimementioning

confidence: 99%

A critical review of flow maps for gas-liquid flows in vertical pipes and annuli

Mitchell

Rufford

et al. 2017

Chemical Engineering Journal

139

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The accurate prediction of two-phase gas and liquid flow regimes is important in the proper design, operation and scale-up of pressure management and fluid handling systems in a wide range of industrial processes. This paper provides a comprehensive review of 3947 published experimental data points for gas-liquid flow maps in vertical pipes and annuli, including a critical analysis of state-of-the-art measurement techniques used to identify bubble, slug, churn and annular flow regimes. We examine the critical factors of pipe geometry (diameters, deviation from vertical), fluid properties and flow conditions that affect the transition from one flow regime to another. The review surveys the theoretical models available to predict flow regime transitions, and we validate the accuracy of these models using the published experimental data. The most reliable flow regime transition models for Moreover, based on the review we provide an outlook on the research needs and important developments in prediction of two-phase flow in vertical pipes including the use of computational fluid dynamics (CFD) techniques to simulate gas-liquid flows in vertical geometries.

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“…Para escoamento bifásico líquido-gás em tubulações verticais os mapas de fluxo mais utilizados são (Taitel, et al, 1980), (Mishima e Ishii, 1984) e (McQuillan e Whalley, 1985).A comparação destes mapas para um escoamento de ar e água à pressão de 1 atm, em um tubo de diâmetro 25 mm e para um comprimento de entrada de 6,25m (l/D=250) encontra-se ilustrada na Figura 2.3.…”

Section: Mapas De Fluxounclassified

“…Figura 2.3 -Comparação dos mapas de fluxo de Taitel et al (1980), Mishima e Ishii (1984) e McQuillan e Whalley (1985). Ar-água; D=25 mm; l/D=250; pressão atmosférica.…”

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Estudo Do Escoamento Bifásico Intermitente Em Uma Expansão Súbita

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Flow patterns in vertical two-phase flow

Cited by 194 publications

References 8 publications

The Role of Drops in Annular Gas-Liquid Flow: Drop Sizes and Velocities

The Role of Drops in Annular Gas-Liquid Flow: Drop Sizes and Velocities

A critical review of flow maps for gas-liquid flows in vertical pipes and annuli

Estudo Do Escoamento Bifásico Intermitente Em Uma Expansão Súbita

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