Research on variation of static contact angle in incomplete wetting system and modeling method

Jiang, Jianjun; Guo, Qiang; Wang, Bailing; Zhou, Linchao; Xu, Chumeng; Deng, Chao; Yao, Xuming; Su, Yang; Wang, Junbiao

doi:10.1016/j.colsurfa.2016.05.051

Cited by 9 publications

(9 citation statements)

References 16 publications

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“…The OCA20 type of optical CA measuring device produced by German Dataphysics Company was employed in this experiment, and the static CA measurement method was applied . The droplet solution was set up to 4 μL, and the sample table was raised to touch the suspended droplets when measuring, which could avoid gravity error caused by free drop of droplets.…”

Section: Methodsmentioning

confidence: 99%

Wettability modification and its influence on methane adsorption/desorption: A case study in the Ordos Basin, China

Zhang

et al. 2019

Energy Science & Engineering

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Wettability modification of coal rock may cause serious change in the methane adsorption/desorption behaviors. Thus, the contact angle measurement and isothermal adsorption/desorption experiment of raw coal and samples treated with surfactants (STS) were conducted to investigate the wetting properties and methane adsorption/desorption characteristics. The results indicated that the long‐flame coal (LFC) has the good hydrophilicity itself, and there was no evident sign of saturated adsorption for different samples at relatively low‐pressure (<8 MPa) stage. The sample treated with the wettability reversal agent (G502) had the larger methane adsorption capacity than the wetted samples (LAS, JFC, and 6501), with the latter facilitating the methane desorption. Additionally, the adsorption capacity of the air‐dried samples was stronger than that of the water‐containing samples, including the moisture‐equilibrated, LAS, JFC, and 6501, reflecting that the better the hydrophilicity, the weaker the methane adsorption. Besides, the desorption hysteresis rate of the same sample was mainly controlled by pressure, i.e. the desorption hysteresis indicated a logarithmic decrease with the increasing pressure, but the STS clearly showed the desorption hysteresis to varying degree due to the wettability differences. The pressure drop in the low‐pressure stage was difficult to drive the adsorbed methane to immediately desorb from the matrix surface, whereas even caused further adsorption or re‐adsorption, meaning that the coal required a greater depressurization to enter the effective desorption stage. Finally, the positive implications of wettability modification including enhancing CBM recovery, as well as coal and methane outburst prevention and coal dust control in the mining industry were discussed.

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Section: Methodsmentioning

confidence: 99%

Wettability modification and its influence on methane adsorption/desorption: A case study in the Ordos Basin, China

Zhang

et al. 2019

Energy Science & Engineering

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“…Compared to Lishfizt van der Waals forces, the contribution due to acid-base interactions is stronger (Oss, 1993). In the context of wetting, the orginal interplay among these polar and nonpolar intermolecular forces at the three-phase contact line defines the ambient or staitc wettabilty state of a system (Jiang, et al, 2016), while their evolution in response to changes in physiochenical conditions, such as system temperature, pressure, aqueous and non aqueous phase components concentrations and pH causes wettability change (Joud et al,3013). The case of pH change is directly linked to electrostitic charge and potential similar to the case of electric induced dynamic wetting in the field of electrowetting (Schneemilch et al, 2000).…”

Section: Physiochemistry Of Wettingmentioning

confidence: 99%

“…Also, the importance of double layer repulsion, which draws largely on increased surface charge density (Philipsea et al, 2017) and its contribution to disjoining pressure stabilization of the prewetting film has been reported (Joud et al, 2013). Simply put, increase in surface charge density or surface potential has been the major factor for wettability enhancement (Park et al, 2011;Guo et al, 2016). In the field of enhanced oil recovery, many experimental studies have been performed in an attempt to unveil the underlying mechanism behind wettability alteration while zeta-potential measurements have proved that Ca 2+ , Mg 2+ and SO 2−4 are strong potential-determining ions that are strongly related to the surface charge/potential (Liu, et al, 2018).…”

Section: Relationship Of Our Models To Observed Ph Dependent Trends Omentioning

confidence: 99%

Derivation of a pH Dependent Solid-Liquid Interfacial Tension and Theoretical Interpretation of the Physicochemistry of Dewetting in the CO2-Brine-Silica System

Amadu¹,

Miadonye²

2019

IJC

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The solid-liquid interfacial tension is a fundamental parameter in areas of wettability pertaining to adhesive bonds and petroleum engineering practice. In wettability issues related to surface functionalized polymeric materials design to achieve specific adhesive properties, the solid-liquid interfacial tension can be pH dependent due to amphoteric behavior. In this paper, we have used the theory of pH dependent surface charging and the 2-pk model as well as the site binding model of the electric double layer theory to derive a pH dependent solid-liquid interfacial tension equation. Following the fundamental relationship between solid-liquid interfacial tension and contact angle in light of Young’s equation, we have extended the theoretical basis of the derivation. Consequently, we have also derived a pH dependent cosine of the thermodynamic contact angle. Both equations give satisfactory explanations for observed experimental data available in the literature.

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“… 19 − 22 Rayleight and Bashfort-Adams calculated the static meniscus height and meniscus shape in the cylindrical geometry tube. 23 , 24 …”

Section: Introductionmentioning

confidence: 99%

Modeling Approach to Determine Static Rivulet Height in Regular Polygonal Capillary Tubes

et al. 2022

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The rise of partially wetting liquids along the corners of noncircular capillary tubes is observed in many practical science and engineering applications such as wastewater treatment using membranes, remediation, oil recovery from petroleum reservoirs, and blood flow. In this paper, rivulet rise at the corners of polygonal capillary tubes is studied for partially wetting liquids with contact angles below the critical value. The presence of corners changes the distribution of a liquid in an incomplete wetting condition. In this study, geometrical models are proposed to better understand the capillary rise and flow behavior at the corners. A geometrical solution for the capillary rivulet height and profile is derived under gravity in triangular, square, and pentagonal capillary tubes. The effects of several factors including contact angle, number of polygon sides, and liquid properties on the capillary rivulet height are examined. It was found that the ratio of liquid surface tension to density directly affects the corner rise, while it has an inverse relationship with other factors. The maximum rivulet height of 91.6 mm is obtained in the triangular capillary tube with a side length of 1 mm and a contact angle of 30° for polydimethylsiloxane (PDMS-20)-air fluid pair. The minimum capillary rivulet height of 6.2 mm, on the other hand, is achieved in the pentagonal capillary tube, with a side length of 3 mm and a contact angle of 30°. To validate the developed analytical approach, comparisons are made between the model results, literature predictions, and experimental data. In addition, the geometrical model for a square capillary tube is compared with previous published studies, revealing a good agreement. This study provides quantitative results for the influence of capillary tube shape on the flow behavior of fluids in noncircular tubes that can be useful for control and optimization of transport phenomena in corresponding systems.

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Research on variation of static contact angle in incomplete wetting system and modeling method

Cited by 9 publications

References 16 publications

Wettability modification and its influence on methane adsorption/desorption: A case study in the Ordos Basin, China

Wettability modification and its influence on methane adsorption/desorption: A case study in the Ordos Basin, China

Derivation of a pH Dependent Solid-Liquid Interfacial Tension and Theoretical Interpretation of the Physicochemistry of Dewetting in the CO2-Brine-Silica System

Modeling Approach to Determine Static Rivulet Height in Regular Polygonal Capillary Tubes

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