Prediction of wall shear for horizontal annular air–water flow

Schubring, D.; Shedd, Timothy A.

doi:10.1016/j.ijheatmasstransfer.2008.05.040

Cited by 18 publications

(3 citation statements)

References 23 publications

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“…In addition, Schubring and Shedd [19] proposed an empirical correlation for wall shear stress of air-water twophase annular flow based on the experimental results under normal temperature and pressure:…”

Section: Wall Shear Stressmentioning

confidence: 99%

Studying Disturbance Wave Velocity and Wall Shear Stress of Vertical Upward Annular Flow in Narrow Rectangular Channel

Liu

Yan

Zhu

et al. 2021

Science and Technology of Nuclear Installations

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As two important parameters, the velocity of disturbance wave and the wall shear stress in annular flow are very important to solve the closed equations of the mechanical model for annular flow. In this study, the disturbance wave velocity and wall shear stress of annular flow in a vertical narrow rectangular channel with a cross section of 70 mm × 2 mm were studied. According to the experimental results, it is found that the wave velocity and wall shear stress of disturbance wave increase with increasing gas phase velocity and liquid phase velocity. Also, existing correlations for predicting the velocity of disturbance wave were summarized and evaluated using the current experimental data. A new correlation for wall shear stress based on the disturbance wave velocity has been proposed. Compared with the existing correlation for predicting wall shear stress, this new correlation can well predict the current experimental data and MAPE is only 7.32%.

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Section: Wall Shear Stressmentioning

confidence: 99%

Studying Disturbance Wave Velocity and Wall Shear Stress of Vertical Upward Annular Flow in Narrow Rectangular Channel

Liu

Yan

Zhu

et al. 2021

Science and Technology of Nuclear Installations

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show abstract

“…As discussed by Ashwood [5] and Schubring and Shedd [34], it is still not clear that the liquid film flow meets any standard definition of turbulence as applied to single-phase flow. The liquid film, in fact, has a thickness that is typically of the same order as the Kolmogorov and Taylor length scales.…”

Section: Summary-annular Flow Pivmentioning

confidence: 99%

Two-Phase Internal Flow: Toward a Theory of Everything

Shedd

2013

Heat Transfer Engineering

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Two-phase flow and heat transfer is still an area of intense research and great uncertainty. Even severely restricting ourselves to just annular, internal two-phase flow does not significantly improve our chances of accurately predicting either pressure gradients or heat transfer coefficients for an arbitrary tube geometry or fluid. This article summarizes a series of investigations that aim to identify the fundamental governing physics of internal two-phase flow: a Theory of Everything. The techniques developed to do so have been varied, and novel approaches are presented here. At the macro scale, simultaneous visualization and measurement of pressure gradient have led to interesting observations about the relationship between flow regimes and these fundamental macroscale behaviors. Since the macroscale behaviors are governed, for the most part, by behaviors at the micro scale, a number of techniques have been developed to study this near-wall behavior in quantitative detail. In particular, dye-assisted planar laser induced fluorescence has provided the first accurate portrayals of the gas-liquid interface annular flow, and microscale multiphase particle image velocimetry has been used to obtain the velocity within the liquid film of annular flow from within micrometers of the wall to velocities within the waves 500 µm or more from the wall. Statistical analyses of these data point toward a general approach for modeling wall shear in two-phase concurrent internal flow.

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“…This model utilizes shear stress and drag forces to simplify the calculation of interaction forces in DNS. Agrawal et al [11][12][13] experimentally studied the shear stress and drag forces in gas-liquid two-phase flow and proposed various models for the fluid-wall and interfacial friction factors. Theoretically, the friction can be determined by using the fluid local velocity and Reynolds number.…”

Section: Introductionmentioning

confidence: 99%

A Novel Model for the Prediction of Liquid Film Thickness Distribution in Pipe Gas-Liquid Flows

Wang,

Yu,

Wang

et al. 2024

FDMP

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A model is proposed for liquid film profile prediction in gas-liquid two-phase flow, which is able to provide the film thickness along the circumferential direction and the pressure gradient in the flow direction. A two-fluid model is used to calculate both gas and liquid phases' flow characteristics. The secondary flow occurring in the gas phase is taken into account and a sailing boat mechanism is introduced. Moreover, energy conservation is applied for obtaining the liquid film thickness distribution along the circumference. Liquid film thickness distribution is calculated accordingly for different cases; its values are compared with other models and available experimental data. As a result, the newly proposed model is tested and good performances are demonstrated. The liquid film thickness distribution in small pipes and inclined pipes is also studied, and regime transition is revealed by liquid film profile evolution. The observed inflection point demonstrates that the liquid film thickness decreases steeply along the circumference, when the circle angle ranges between 30°and 50°for gas-liquid stratified flow with small superficial velocities.

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Prediction of wall shear for horizontal annular air–water flow

Cited by 18 publications

References 23 publications

Studying Disturbance Wave Velocity and Wall Shear Stress of Vertical Upward Annular Flow in Narrow Rectangular Channel

Studying Disturbance Wave Velocity and Wall Shear Stress of Vertical Upward Annular Flow in Narrow Rectangular Channel

Two-Phase Internal Flow: Toward a Theory of Everything

A Novel Model for the Prediction of Liquid Film Thickness Distribution in Pipe Gas-Liquid Flows

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