3D numerical study of a single Taylor bubble rising along an inclined tube through Newtonian and non-Newtonian liquids

Silva, M.C.F.; Campos, Joana; Araújo, J.D.P.

doi:10.1016/j.cep.2022.109219

Chemical Engineering and Processing - Process Intensification

2023

DOI: 10.1016/j.cep.2022.109219

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3D numerical study of a single Taylor bubble rising along an inclined tube through Newtonian and non-Newtonian liquids

M.C.F. Silva

Joana Campos

J.D.P. Araújo

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Cited by 4 publications

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“…Currently, significant progress has been made in investigating the flow characteristics, motion laws, influencing factors, and other aspects of slug flow through numerical simulation [19][20][21], laboratory testing [22][23][24], and field observation [25][26][27]. Furthermore, some studies are dedicated to developing innovative technologies and devices for preventing and mitigating slug flow, which can enhance the effectiveness and safety of transport pipelines.…”

mentioning

confidence: 99%

Experimental and OLGA Modeling Investigation for Slugging in Underwater Compressed Gas Energy Storage Systems

Liang,

Xiong,

Wang

et al. 2023

Applied Sciences

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Underwater compressed gas energy storage (UW-CGES) holds significant promise as a nascent and viable energy storage solution for a diverse range of coastal and offshore facilities. However, liquid accumulation in underwater gas pipelines poses a significant challenge, as it can lead to pipeline blockages and energy transmission interruptions and adversely impact pipeline operation. In this paper, experimental and Oil and Gas Assays (OLGA) simulation studies have been conducted on the formation process of slug flow in pipelines. Firstly, experiments are conducted to capture high-speed camera images of slug flow under various liquid accumulation volumes and inclination angles. Subsequently, an OLGA model is developed to verify the experimentally observed flow regime, pressure, and slugging speed. Therefore, the flow regime verification results exhibit substantial consistency, and pressure variations display uniform trends, with an average slugging velocity error of 6.42%. The results indicate that the formation of slug flow involves three distinct stages: slug flow growth, ejection, and backflow. By analyzing slug flow, it can gain insights into the relationship between pressure and slug flow formation, exposing the sensitivity of this phenomenon to pressure fluctuations. These results further enhance recognition of the operational status of UW-CGES pipelines and provide support for safe operation.

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mentioning

confidence: 99%

Experimental and OLGA Modeling Investigation for Slugging in Underwater Compressed Gas Energy Storage Systems

Liang,

Xiong,

Wang

et al. 2023

Applied Sciences

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Yield Stress Effects on the Dynamics and Liquid Film Thickness of a Taylor Bubble Rising in Vertical and Inclined Tubes

Li,

Duan,

Pang

et al. 2024

Ind. Eng. Chem. Res.

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In this work, the rising dynamics of a threedimensional (3D) Taylor bubble in vertical and inclined tubes filled with yield stress fluids are investigated by means of direct numerical simulations. The gas−liquid interface is captured by the volume-of-fluid (VOF) method with adaptive mesh refinement technique. The Herschel−Bulkley model is used to evaluate the rheological behavior of viscoplastic fluids that exhibit a yield response. The reliability of the present simulation to capture the bubble shape and liquid film for a deformed Taylor bubble is validated by comparisons with experimental results in the literature. Our findings reveal a non-monotonic correlation between the stable bubble velocity and yield stress values across a broad range of values. The interplay among the shear stress generated by the rising bubble, the fluid's yield stress, and the pressure gradient due to changes in the liquid film thickness is primarily responsible for this phenomenon. In addition, different from the symmetrical liquid film and flow field observed in vertical tubes, the symmetrical characteristic is lost in inclined tubes. The results also reproduce the peculiar phenomenon that the rise velocity of Taylor bubbles peaks at a certain inclination angle in yield stress fluids. At smaller inclined angles, the shear stress generated by the tail flow field could overcome yield stress, causing the fluid around the bubble tail to have shear-thinning characteristics. As the tube further tilts, the lower liquid film gradually thickens, and the bubbles behave as if they are in a Newtonian fluid. This work provides important insights into the petroleum industry involving complex yield stress fluids, as well as an understanding of the mechanisms of Taylor bubble dynamics in inclined tubes.

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Draining of shear-thinning liquids from closed-top millichannels

Samanta,

Priyanka,

Roy

et al. 2023

Physics of Fluids

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Draining from a closed-top tube occurs by downward displacement of liquid by air. The air volume grows inside the tube as an axisymmetric bullet-shaped finger similar to the Taylor bubble observed in gas–liquid slug flows, and the liquid drains as an annular film between the finger and the tube wall. The present study investigates the draining of shear-thinning vis-à-vis Newtonian liquids from closed-top circular millichannels. Numerical simulations using the phase-field method suggest that both the power law and Carreau models give close predictions of draining behavior in the investigated domain, i.e., for shear rate >0.1 s−1. The results are validated against experimental measurements based on high-speed photography and particle image velocimetry during the draining of aqueous solutions of carboxymethyl cellulose, xanthan gum, and glycerol. Further validations are performed for shear-thinning (using the power law, Carreau, and Carreau–Yasuda models) and Newtonian liquids with literature data on Taylor bubble rise in stationary liquid columns. The simulations using the power law model are used to explore additional insights into the flow physics. An increase in the apparent viscosity of shear-thinning liquids (by increasing the flow behavior index and/or flow consistency index) slows down the rate of Taylor finger growth. Increased liquid viscosity also results in a slender Taylor finger and leaves a higher amount of undrained liquid at the end of film-wise draining. The draining rate is a more significant function of flow behavior index n of the power law model for highly shear-thinning liquids (n < 0.6).

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3D numerical study of a single Taylor bubble rising along an inclined tube through Newtonian and non-Newtonian liquids

Cited by 4 publications

References 44 publications

Experimental and OLGA Modeling Investigation for Slugging in Underwater Compressed Gas Energy Storage Systems

Experimental and OLGA Modeling Investigation for Slugging in Underwater Compressed Gas Energy Storage Systems

Yield Stress Effects on the Dynamics and Liquid Film Thickness of a Taylor Bubble Rising in Vertical and Inclined Tubes

Draining of shear-thinning liquids from closed-top millichannels

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