Surface wettability effect on the rising of a bubble attached to a vertical wall

Javadi, Khodayar; Davoudian, Salar Heyat

doi:10.1016/j.ijmultiphaseflow.2018.06.015

Cited by 16 publications

(4 citation statements)

References 61 publications

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“…Xiao Kang Yan [14] conducted numerous experiments using a high-speed video system and proposed an equation for predicting the drag coefficient. Khodayar [15] investigated the dynamics of rising bubbles on vertical walls under different wettability conditions, discovering that bubbles with contact angles less than 90° move faster than bubbles with contact angles more than 90°. Du Jingyu [16] found that bubble lift-off diameter is arranged to be related to wall superheat, latent heat, liquid velocity, fluid properties, bulk liquid subcooling, etc.…”

Section: Introductionmentioning

confidence: 99%

Study on the Mechanism of Gas Intrusion and Its Transportation in Wellbore Under Shut-In Conditions

Zhu,

Xiang,

Yang

et al. 2023

Preprint

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This paper presents a comprehensive study based on multiphase seepage and wellbore multiphase flow theories. It establishes a gas intrusion rate calculation model that considers various factors including formation pore permeability, bottomhole pressure difference, drilling fluid rheology, and surface tension. Experiments were conducted to investigate the gas intrusion mechanism under shut-in conditions, and the experimental results were employed to validate the reliability of the proposed gas intrusion rate calculation method. Furthermore, the research explores the transportation rates of single bubbles and bubble clusters in drilling fluid under shut-in conditions. Meanwhile, empirical expressions were derived for the drag coefficient for single bubbles and bubble clusters in the wellbore. These expressions can be used to calculate gas transportation rates for various equivalent radii of single bubbles and bubble clusters. Additionally, a method was developed for calculating the rising velocity of bubble clusters in water based on experimental results. The study reveals that the average bubble size in the bubble cluster is significantly smaller than the size of the single bubble generated from the orifice. When the viscosity of the drilling fluid is low, the bubble cluster transportation velocity exhibits a positive correlation with the average bubble diameter. When the average bubble diameter exceeds 1 mm, the bubble velocity no longer varies with the change in the bubble cluster diameter. The initial bubble size of intrusive gas, the transportation speed of intrusive gas in the wellbore, the gas intrusion rate, and variations of the wellbore pressure after gas intrusion were analyzed. The research results provide theoretical support for wellbore pressure prediction and pressure control under shutdown conditions.

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Section: Introductionmentioning

confidence: 99%

Study on the Mechanism of Gas Intrusion and Its Transportation in Wellbore Under Shut-In Conditions

Zhu,

Xiang,

Yang

et al. 2023

Preprint

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“…With a combination of surface chemical and roughness modifications in superhydrophobic materials, water drops on a SHS show a large contact angle (CA) and a small CA hysteresis. On a smooth surface, the contact angle of a water droplet can be increased to only 120° by lowering the surface free energy [12]. The construction of micro/nano-structures on a smooth surface can lead to contact angles of water drops of up to 150°.…”

Section: Introductionmentioning

confidence: 99%

Drop Behavior on Micro-Structured Superhydrophobic Coating

Moghadam¹,

Taeibi²,

Davoudian³

et al. 2022

JSST

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Superhydrophobic coatings can be made by creating a micro-sized structure on a surface providing super-repellent properties which have many applications in aerospace, defense, automotive, biomedical and engineering. Numerical simulation of drop dynamics and motion on a superhydrophobic surface helps us understand control and building surface textures and find optimum micro structured coatings of the maximum hydrophobicity. In the present work, the dynamics of drops on superhydrophobic inclined micro-structured surfaces is studied, using a finite element method. Effects of microstructures on droplet behavior on a superhydrophobic surface is investigated using different microstructures. The governing equations and important dimensionless numbers are described and a numerical algorithm is introduced. The validation of the numerical algorithm is performed by simulation of drop motion attached to an inclined surface. In addition, droplet movement on the micro structured surface is numerically simulated on smooth and microstructure surfaces in the same conditions. Comparison of the results shows the effect of microstructure coating on the surface hydrophobicity properties.

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“…This is usually accompanied by a significant deformation of the bubble, indicating the interaction between aerodynamic drag and gravitational forces in fluids with the variation of parameters such as viscosity and surface tension [8,9]. The deformations of bubble domains cause different characteristics of flow patterns around the bubble and the liquid surrounding [10,11], where several experimental studios discussed that problem [12,13]. Thereby, studies include the rise of a bubble in an immiscible and viscous liquid [14,15].…”

Section: Introductionmentioning

confidence: 99%

Numerical study of single bubble rising dynamics for the variability of moderate Reynolds and sidewalls influence: A bi-phase SPH approach

Patiño-Nariño

Galvis

Pavanello

et al. 2021

Engineering Analysis with Boundary Elements

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Surface wettability effect on the rising of a bubble attached to a vertical wall

Cited by 16 publications

References 61 publications

Study on the Mechanism of Gas Intrusion and Its Transportation in Wellbore Under Shut-In Conditions

Study on the Mechanism of Gas Intrusion and Its Transportation in Wellbore Under Shut-In Conditions

Drop Behavior on Micro-Structured Superhydrophobic Coating

Numerical study of single bubble rising dynamics for the variability of moderate Reynolds and sidewalls influence: A bi-phase SPH approach

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