Estimation of Local Liquid Film Thickness in Two-Phase Annular Flow

Lee, Bo An; Yun, Byong-Jo; Kim, Kyung Youn; Kim, Sin

doi:10.5516/net.02.2011.013

Cited by 3 publications

(1 citation statement)

References 18 publications

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“…Further details on types, principle of operation, design, and electronics can be found in the many published articles are available in the open literature (e.g. Coney [41], Koskie et al [42], Tsocharitzidis et al [43], and [44]). The film thickness probes used in this study were manufactured in-house and the design is shown schematically in Figure 3.…”

Section: Film Thickness Probesmentioning

confidence: 99%

Interfacial friction in upward annular gas–liquid two-phase flow in pipes

Aliyu

Baba

Lao

et al. 2017

Experimental Thermal and Fluid Science

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Accurate prediction of interfacial friction between the gas and liquid in annular two-phase flow in pipes is essential for the proper modelling of pressure drop and heat transfer coefficient in pipeline systems. Many empirical relationships have been obtained over the last half century. However, they are restricted to limited superficial liquid and gas velocity ranges, essentially apply to atmospheric pressures, and the relationships are only relevant for pipes with inner diameters between 10 and 50 mm. In this study, we carried out experiments in a large diameter flow loop of 101.6 mm internal diameter with the superficial gas and liquid ranges of 11-29 m/s and 0.1-1.0 m/s respectively. An examination of published interfacial friction factor correlations was carried out using a diverse database which was collected from the open literature for vertical annular flow. The database includes measurements in pipes of 16-127 mm inner diameter for the liquid film thickness, interfacial shear stress, and pressure gradient for air-water, air-water/glycerol, and argon-water flows. Eleven studies are represented with experimental pressures of up to 6 bar. Significant discrepancies were found between many of the published correlations and the large pipe data, primarily in the thick film region at low interfacial shear stress. A correlation for the interfacial friction factor was hence derived using the extensive database. The correlation includes dimensionless numbers for the effect of the diameter across pipe scales to be better represented and better fit the wide range of experimental conditions, fluid properties, and operating pressures.

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Section: Film Thickness Probesmentioning

confidence: 99%

Interfacial friction in upward annular gas–liquid two-phase flow in pipes

Aliyu

Baba

Lao

et al. 2017

Experimental Thermal and Fluid Science

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Onset of Nucleate Boiling, Void Fraction, and Liquid Film Thickness

Ghosh

Raj

Mohanty

et al. 2016

Microchannel Phase Change Transport Phenomena

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Numerical Studies on the Oil Film Thickness in the Case of Stratified Flow With Different Oil–Water Flow Combinations Through Sudden Contraction Tube

Momin,

Mahindar,

Rahmani

et al. 2023

Journal of Fluids Engineering

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Most of the oil transportation industries deal with liquid–liquid flow considering the adiabatic situation. In such applications, film thickness measurement plays a very significant role in understanding the flow characteristics. The distribution of phases for efficient wall treatment and to understand the phase distribution, measurement of film thickness is very important. Among different flow patterns, stratified flow is most common for low and medium viscous oil–water flow. At lower oil velocities, stratified flow is observed downstream of singularity whereas in the upstream section, stratified flow is observed for low to medium oil velocities and high-water superficial velocity. Variation of oil film thickness for stratified flow has been analyzed in this study. Results show that oil film thickness decreases with the increase in the superficial velocity of water (Us-Water) for a constant oil superficial velocity (Us-Oil). With the increase in the volume fraction of one phase, the film thickness of that phase increases. As Us-Oil increases, the film thickness of oil also increases for a constant Us-Water. Oil film thickness is directly proportional to the viscosity of oils. This means, the more the viscosity of the oil, the more will be the oil film thickness.

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Estimation of Local Liquid Film Thickness in Two-Phase Annular Flow

Cited by 3 publications

References 18 publications

Interfacial friction in upward annular gas–liquid two-phase flow in pipes

Interfacial friction in upward annular gas–liquid two-phase flow in pipes

Onset of Nucleate Boiling, Void Fraction, and Liquid Film Thickness

Numerical Studies on the Oil Film Thickness in the Case of Stratified Flow With Different Oil–Water Flow Combinations Through Sudden Contraction Tube

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