Active control of electro-visco-fingering in Hele-Shaw cells using Maxwell stress

Li, Peiliu; Huang, Xianfu; Zhao, Ya-Pu

doi:10.1016/j.isci.2022.105204

Cited by 15 publications

(13 citation statements)

References 76 publications

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“…However, a model of the formation of a very thin precursor film (PF), usually a single molecular layer propagating ahead of the nominal contact line should be explored. This sound hypothesis which deserves to be explored has been demonstrated in several cases where wetting of 2 different fluids gives rise to such a thin precursor film as per the relatively recent investigations of Yuan et al and Li et al 72 , 73 .…”

Section: Resultsmentioning

confidence: 84%

Physical properties of computationally informed phyto-engineered 2-D nanoscaled hydronium jarosite

Botha

Cloete

Welegergs

et al. 2023

Sci Rep

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This study describes a molecular dynamics computational modelling informed bioengineering of nano-scaled 2-D hydronium jarosite. More specifically, a phyto-engineering approach using green nano-chemistry and agro-waste in the form of avocado seed natural extract was utilized as a green, economic, and eco-friendly approach to synthesize this unique mineral at the nanoscale via the reduction of iron (II) sulphate heptahydrate. The nanoproduct which was found to exhibit a quasi-2D structure was characterized using a multi-technique approach to describe its morphological, optical, electrochemical, and magnetic properties. Radial distribution function and electrostatic potential maps revealed that flavone, a phenolic compound within the avocado seed natural extract, has a higher affinity of interaction with the nanoparticle's surface, whilst vanillic acid has a higher wetting tendency and thus a lower affinity for interacting with the hydronium jarosite nanoparticle surface compared to other phytoactive compounds. XRD and HRTEM results indicated that the nanoscale product was representative of crystalline rhombohedral hydronium jarosite in the form of quasi-triangular nanosheets decorated on the edges with nanoparticles of approximately 5.4 nm diameter that exhibited significant electrochemical and electroconductive behaviours. Magnetic studies further showed a diamagnetic behaviour based on the relationship of the inverse susceptibility of the nanomaterial with temperature sweep.

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Section: Resultsmentioning

confidence: 84%

Physical properties of computationally informed phyto-engineered 2-D nanoscaled hydronium jarosite

Botha

Cloete

Welegergs

et al. 2023

Sci Rep

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“…Therefore, the greater the height of the drop, the more severe the curvature of the shape it experiences. The influence of gravity on the drop shape can be described using the Bond number. − The mean Bond numbers for water drops on glass and PTFE surfaces are 3.93 and 1.38, respectively, which indicates that gravity is a significant factor affecting the contact angles in our experiments.…”

Section: Resultsmentioning

confidence: 90%

Determination of Sessile Drop Wetting Angle Based on μCT without the Direct Angle Measurement

2023

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Wettability is an important factor that controls the position and transport of fluids in the porous structure of a hydrocarbon reservoir. Direct quantitative wettability measurement methods include determination of the contact angle. One of the popular laboratory methods for its measurement is the sessile drop method, where the droplet of liquid is set onto the solid sample surface and the angle between liquid and solid phases in a 2D profile image is measured using a high-resolution optical subsystem. However, this method has disadvantages connected with three complex factors: two-dimensionality of data, image resolution, and the presence of wetting domains on the solid surface. In this work, we propose a method based on 3D μCT scanning of a sessile drop on the surface of a material and determination of the value of the wetting angle using drop height and volume measurements. Since the contact angle is not measured directly, this makes it possible to obtain averaged contact angle values for the entire droplet and leads to more stable values for individual measurements in comparison with the standard optical method. The results demonstrate that contact angles obtained using the μCT method differ from the values obtained by various fitting techniques of the 2D optical method: μCT-values are higher for hydrophilic interaction by 4–6° and lower for hydrophobic interaction by 12–17°. Such differences are associated with the lower susceptibility of the proposed method to the influence of the gravitational effect, which leads to a flattening of the droplet shape and distortion of angle measurements on the 2D projections. However, the described method showed close contact angles for water drops on a polytetrafluoroethylene surface with values obtained in microgravity and can be helpful for its prediction. It also has relatively low sensitivity to the absolute values of the drop volume and drop segmentation errors.

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“…Further literature can be view and analyzed through Refs. [36][37][38][39] . Venkata et al 40 had discussed the impact of Soret and Dufour on MHD Casson fluid flow past a stretching surface with convective diffusive conditions.…”

Section: Variablementioning

confidence: 99%

Variable fluid properties analysis for thermally laminated 3-dimensional magnetohydrodynamic non-Newtonian nanofluid over a stretching sheet

Akbar

Al-Zubaidi

Saleem

et al. 2023

Sci Rep

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This article is mainly focused on the viscous flow of cu-water/Methanol suspended nanofluids towards a three-dimensional stretching sheet reformed by magnetohydrodynamic phenomenon. The viscous effect is considered as temperature dependent with water treated as a base fluid. Similarity conversions are employed to set forth the non-linear equations of this physical problem. An innovative model for 3D analysis for cu-water/Methanol nanofluid with an irregular viscosity is presented in the present study. Reynold’s model of viscosity is considered in the present study. Moreover, shooting technique is employed to elaborate the non-linear coupled governing equations with the relevant boundary conditions. The physical interpretation of these numerical calculations is presented through a graphical specimen of velocity, Nusselt number, temperature, and skin friction etc. The results of present model are showing quality harmony with the results of existing model. This model is being used for manipulating and designing the surfaces such as stretching/shrinking wrapping and panting devices in nanotechnology. The results also show the significant changes in flow characteristics with changing the value of stretching parameter. It is observed that with an increasing in nanoparticles volume fraction boundary layer thickness decreases. Further, it is also observed that with an increase in viscosity parameter, temperature increases because here we are considering temperature dependent viscosity.

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Active control of electro-visco-fingering in Hele-Shaw cells using Maxwell stress

Cited by 15 publications

References 76 publications

Physical properties of computationally informed phyto-engineered 2-D nanoscaled hydronium jarosite

Physical properties of computationally informed phyto-engineered 2-D nanoscaled hydronium jarosite

Determination of Sessile Drop Wetting Angle Based on μCT without the Direct Angle Measurement

Variable fluid properties analysis for thermally laminated 3-dimensional magnetohydrodynamic non-Newtonian nanofluid over a stretching sheet

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