Studies on two-phase co-current air/non-Newtonian shear-thinning fluid flows in inclined smooth pipes

Xu, Jing-yu; Wu, Yue; Shi, Zai-hong; Lao, Liyun; Li, Donghui

doi:10.1016/j.ijmultiphaseflow.2007.03.008

Cited by 39 publications

(32 citation statements)

References 28 publications

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“…Tab. 1 summarizes the properties of experimental data and includes 676 data points relating to various experimental systems, different pipe diameter, different physical properties of fluids, and superficial velocities [2][3][4][8][9][10]. These data will be applied to evaluate the above-described models and correlations.…”

Section: Resultsmentioning

confidence: 99%

“…Knowledge of the frictional characteristics is essential since it could improve the accuracy of the process system design. Unlike for gas/Newtonian fluids flow, only little research work has been devoted to study the pressure drop of two-phase flow in pipes when the liquid phase exhibits non-Newtonian fluid behavior [1][2][3][4][5][6][7][8][9][10][11]. In general, these studies indicate that the hydrodynamics of gas/nonNewtonian fluids flow in pipes behaves differently from that of the gas/Newtonian liquid flow, which is of great industrial importance in the transport of fluids and related operations.…”

Section: Introductionmentioning

confidence: 99%

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Pressure Drop Models for Gas/Non‐Newtonian Power‐Law Fluids Flow in Horizontal Pipes

Gao

Zhang

2014

Chem Eng & Technol

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Models commonly used in literature are evaluated versus 696 data points to predict the pressure drop of gas/non-Newtonian power-law fluids flow in horizontal pipes. Suitable models are recommended. A new correlation is developed by ignoring the pressure drop across the gas slug and adopting the liquid slug holdup of gas/non-Newtonian fluid flow into the homogeneous model. The theoretical curves can capture the test data trends and the overall agreement of predicted values with experimental data is sufficient to be practically applied in industry.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Pressure Drop Models for Gas/Non‐Newtonian Power‐Law Fluids Flow in Horizontal Pipes

Gao

Zhang

2014

Chem Eng & Technol

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“…It can been found in Section 2.2 that the calculations have been performed depending on the conditions of a Newtonian fluid, not those of a non-Newtonian fluid, because for the mixture flow of gas/non-Newtonian fluid, no reliable methods exist for the calculation of the translation velocity, u t , nor for the liquid holdup within the liquid slug,˛s. However, for predicting the average liquid holdup, the model can describe the majority of the experimental data within 20% [12]. Fig.…”

Section: Drag Reduction In Slug Flowmentioning

confidence: 99%

“…Drag reduction can be formed by adding drag reduction agent (DRA) into a fluid, which would lead to a reduction in the two-phase pressure drop when the gas and liquid flow rates are fixed [1][2][3][4][5]. Another phenomenon that can be defined as the drag reduction is the injection of gas into nonNewtonian liquid, especially for pseudoplastic liquids, at a given liquid flow rate [6][7][8][9][10][11][12][13][14]. The present study focuses on the latter system by using the two-fluid modeling.…”

Section: Introductionmentioning

confidence: 99%

“…The experimental data showed that drag reduction appeared to be dramatic by injecting relatively low flow rates of air, even more as liquid flow rate decreases. In addiction to these, Xu et al [12] studied the co-current flow characteristics of air/power-law fluid systems in inclined smooth pipes using transparent tubes of 20, 40 and 60 mm in diameter. In their works, the Heywood-Charles model was modified for horizontal flow to accommodate stratified flow in inclined smooth pipes.…”

Section: Introductionmentioning

confidence: 99%

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Study of drag reduction by gas injection for power-law fluid flow in horizontal stratified and slug flow regimes

et al. 2009

Chemical Engineering Journal

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a b s t r a c tIn this work, the drag reduction by gas injection for power-law fluid flow in stratified and slug flow regimes has been studied. Experiments were conducted to measure the pressure gradient within air/CMC solutions in a horizontal Plexiglas pipe that had a diameter of 50 mm and a length of 30 m. The drag reduction ratio in stratified flow regime was predicted using the two-fluid model. The results showed that the drag reduction should occur over the large range of the liquid holdup when the flow behaviour index remained at the low value. Furthermore, for turbulent gas-laminar liquid stratified flow, the drag reduction by gas injection for Newtonian fluid was more effective than that for shear-shinning fluid, when the dimensionless liquid height remained in the area of high value. The pressure gradient model for a gas/Newtonian liquid slug flow was extended to liquids possessing the Ostwald-de Waele power law model. The proposed model was validated against 340 experimental data point over a wide range of operating conditions, fluid characteristics and pipe diameters. The dimensionless pressure drop predicted was well inside the 20% deviation region for most of the experimental data. These results substantiated the general validity of the model presented for gas/non-Newtonian two-phase slug flows.

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CFD simulation of two-phase gas/non-Newtonian shear-thinning fluid flow in pipes

Daza-Gómez

Pereyra

Ratkovich

2019

J Braz. Soc. Mech. Sci. Eng.

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The multiphase flow has always been a major concern since it is encountered in many industrial processes that are crucial. Gas/non-Newtonian two-phase flow is found in the upstream of the petroleum industry, where slug flow is the most common flow pattern. This flow pattern has complex hydrodynamics which is crucial to study and evaluate. This study assessed the two-phase gas/non-Newtonian fluid flow in different configurations of pipes. The model was developed using computational fluid dynamics with an orthogonal mesh to evaluate the behavior of the slug dynamics in the different configurations. The model volume of fluid was used to estimate and predict the most important parameters: pressure drop, slug frequency, and length. First, the model was validated with experimental data found in literature in a horizontal 9-m long glass pipe, with an inner diameter of 22.8 mm. The validation was made with carboxymethyl cellulose CMC-water solutions as test fluids. Two concentrations (w/w) of CMC were used: 1% and 6%. The overall average relative error of the model, taking into account the three parameters, was 24.9%. With this result, it was proceeded to evaluate the model and the effect in the slug flow in three different pipe trajectories: toe-down well, one undulation with a hump well and one undulation with a sump well. The comparison was made between results of a gas/Newtonian fluid flow and the gas/non-Newtonian fluid flow. It was found that the slug frequency and length vary in great form. The slug frequency increased in almost all the cases, and the slug length decreased.

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Studies on two-phase co-current air/non-Newtonian shear-thinning fluid flows in inclined smooth pipes

Cited by 39 publications

References 28 publications

Pressure Drop Models for Gas/Non‐Newtonian Power‐Law Fluids Flow in Horizontal Pipes

Pressure Drop Models for Gas/Non‐Newtonian Power‐Law Fluids Flow in Horizontal Pipes

Study of drag reduction by gas injection for power-law fluid flow in horizontal stratified and slug flow regimes

CFD simulation of two-phase gas/non-Newtonian shear-thinning fluid flow in pipes

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