scholarly journals Interfacial Behaviour in Ferroalloys: The Influence of Sulfur in FeMn and SiMn Systems

2021 ◽  
Author(s):  
Sergey Bublik ◽  
Sarina Bao ◽  
Merete Tangstad ◽  
Kristian Etienne Einarsrud
Keyword(s):  
Contact Angle ◽  
Interfacial Tension ◽  
Sessile Drop ◽  
Interfacial Properties ◽  
Apparent Contact Angle ◽  
Holding Time ◽  
Transfer Rates ◽  
Experimental Parameters ◽  
Interfacial Behaviour ◽  
Modelling Approach

AbstractThe present study has investigated the influence of sulfur content in synthetic FeMn and SiMn from 0 to 1.00 wt pct on interfacial properties between these ferroalloys and slags. The effect of experimental parameters such as temperature and holding time was evaluated. Interfacial interaction between ferroalloys and slags was characterized by interfacial tension and apparent contact angle between metal and slag, measured based on the Young–Laplace equation and an inverse modelling approach developed in OpenFOAM. The results show that sulfur has a significant influence on both interfacial tension and apparent contact angle, decreasing both values and promoting the formation of a metal-slag mixture. Despite the fact that sulfur was added only to the ferroalloys, most of sulfur is distributed into slag after reactions with the metal phase. Increasing the maximum experimental temperature in the sessile drop furnace also resulted in a decrease of both interfacial properties, resulting in higher mass transfer rates and intensive reactions between metal and slag. The effect of holding time demonstrated that after reaching equilibrium in FeMn-slag and SiMn-slag systems (both with and without sulfur), interfacial tension and apparent contact angle remain constant.

scholarly journals Carbon dioxide adsorption and interaction with formation fluids of Jordanian unconventional reservoirs

2021 ◽  
Author(s):  
H. Samara ◽  
T. V. Ostrowski ◽  
F. Ayad Abdulkareem ◽  
E. Padmanabhan ◽  
P. Jaeger
Keyword(s):  
Carbon Dioxide ◽  
Contact Angle ◽  
Interfacial Tension ◽  
Oil Recovery ◽  
Gas Adsorption ◽  
Sessile Drop ◽  
Global Climate ◽  
Gravimetric Method ◽  
Rock Surface ◽  
Operating Pressure

AbstractShales are mostly unexploited energy resources. However, the extraction and production of their hydrocarbons require innovative methods. Applications involving carbon dioxide in shales could combine its potential use in oil recovery with its storage in view of its impact on global climate. The success of these approaches highly depends on various mechanisms taking place in the rock pores simultaneously. In this work, properties governing these mechanisms are presented at technically relevant conditions. The pendant and sessile drop methods are utilized to measure interfacial tension and wettability, respectively. The gravimetric method is used to quantify CO2 adsorption capacity of shale and gas adsorption kinetics is evaluated to determine diffusion coefficients. It is found that interfacial properties are strongly affected by the operating pressure. The oil-CO2 interfacial tension shows a decrease from approx. 21 mN/m at 0.1 MPa to around 3 mN/m at 20 MPa. A similar trend is observed in brine-CO2 systems. The diffusion coefficient is observed to slightly increase with pressure at supercritical conditions. Finally, the contact angle is found to be directly related to the gas adsorption at the rock surface: Up to 3.8 wt% of CO2 is adsorbed on the shale surface at 20 MPa and 60 °C where a maximum in contact angle is also found. To the best of the author’s knowledge, the affinity of calcite-rich surfaces toward CO2 adsorption is linked experimentally to the wetting behavior for the first time. The results are discussed in terms of CO2 storage scenarios occurring optimally at 20 MPa.

scholarly journals Effect of Direct Current on Solid-Liquid Interfacial Tension and Wetting Behavior of Ga–In–Sn Alloy Melt on Cu Substrate

2018 ◽  
Vol 2018 ◽  
pp. 1-7
Author(s):  
Limin Zhang ◽  
Ning Li ◽  
Hui Xing ◽  
Rong Zhang ◽  
Kaikai Song
Keyword(s):  
Contact Angle ◽  
Interfacial Tension ◽  
Direct Current ◽  
Sessile Drop ◽  
Contact Angles ◽  
Current Intensity ◽  
Solute Diffusion ◽  
Wetting Behavior ◽  
Cu Substrate ◽  
Solid Liquid

The effect of direct current (DC) on the wetting behavior of Cu substrate by liquid Ga–25In–13Sn alloy at room temperature is investigated using a sessile drop method. It is found that there is a critical value for current intensity, below which the decrease of contact angle with increasing current intensity is approximately linear and above which contact angle tends to a stable value from drop shape. Current polarity is a negligible factor in the observed trend. Additionally, the observed change in contact angles is translated into the corresponding change in solid-liquid interfacial tension using the equation of state for liquid interfacial tensions. The solid-liquid interfacial tension decreases under DC. DC-induced promotion of solute diffusion coefficient is likely to play an important role in determining the wettability and solid-liquid interfacial tension under DC.

Interfacial characterization with wettability, microstructure and interfacial thermodynamics for Ti–Al/VN system

2019 ◽  
Vol 116 (3) ◽  
pp. 323
Author(s):  
Xuyang Liu ◽  
Xuewei Lv ◽  
Ning Hu ◽  
Jingqi Liu
Keyword(s):  
Contact Angle ◽  
Sessile Drop ◽  
Interfacial Microstructure ◽  
Apparent Contact Angle ◽  
Al Alloy ◽  
Reaction Products ◽  
Phase Line ◽  
Al Content ◽  
Initial Stage ◽  
Interfacial Thermodynamics

Interfacial characterization, which includes wettability, interfacial microstructure and interfacial thermodynamics between VN substrate and Ti–Al molten alloy with different Al concentrations, was studied by the sessile drop method at 1758 K. The wettability between molten Ti–Al alloy and VN depends on alloy composition. The initial apparent contact angle increases from 95 to 120° with increasing Al content from 40 to 80 wt.% in the Ti–Al alloys. The Ti–Al/VN system is a typical dissolution system. The effect of dissolution on the apparent contact angle is reflected in the initial stage and progresses synchronously with movement of the triple-phase line. The wettability of Ti–Al/VN system shows no remarkable improvement with the dissolution of V. AlN and TiN should be formed as the interfacial reaction products during dissolution reaction of VN substrate.

scholarly journals On the contact region of a diffusion-limited evaporating drop: a local analysis

2013 ◽  
Vol 739 ◽  
pp. 308-337 ◽  
Author(s):  
S. J. S. Morris
Keyword(s):  
Contact Angle ◽  
Boundary Value Problem ◽  
Sessile Drop ◽  
Contact Region ◽  
Boundary Value ◽  
Dynamic Contact Angle ◽  
Dynamic Contact ◽  
Apparent Contact Angle ◽  
Local Analysis ◽  
Separation Of Scales

AbstractMotivated by experiments showing that a sessile drop of volatile perfectly wetting liquid initially advances over the substrate, but then reverses, we formulate the problem describing the contact region at reversal. Assuming a separation of scales, so that the radial extent of this region is small compared with the instantaneous radius$a$of the apparent contact line, we show that the time scale characterizing the contact region is small compared with that on which the bulk drop is evolving. As a result, the contact region is governed by a boundary-value problem, rather than an initial-value problem: the contact region has no memory, and all its properties are determined by conditions at the instant of reversal. We conclude that the apparent contact angle$\theta $is a function of the instantaneous drop radius$a$, as found in the experiments. We then non-dimensionalize the boundary-value problem, and find that its solution depends on one parameter$\mathscr{L}$, a dimensionless surface tension. According to this formulation, the apparent contact angle is well-defined: at the outer edge of the contact region, the film slope approaches a limit that is independent of the curvature of bulk drop. In this, it differs from the dynamic contact angle observed during spreading of non-volatile drops. Next, we analyse the boundary-value problem assuming$\mathscr{L}$to be small. Though, for arbitrary$\mathscr{L}$, determining$\theta $requires solving the steady diffusion equation for the vapour, there is, for small$\mathscr{L}$, a further separation of scales within the contact region. As a result,$\theta $is now determined by solving an ordinary differential equation. We predict that$\theta $varies as${a}^{- 1/ 6} $, as found experimentally for small drops ($a\lt 1~\mathrm{mm} $). For these drops, predicted and measured angles agree to within 10–30 %. Because the discrepancy increases with$a$, but$\mathscr{L}$is a decreasing function of$a$, we infer that some process occurring outside the contact region is required to explain the observed behaviour of larger drops having$a\gt 1~\mathrm{mm} $.

WETTING BEHAVIOR OF Al–Mg ALLOYS ON CARBON FIBER FABRIC

2013 ◽  
Vol 20 (03n04) ◽  
pp. 1350036 ◽  
Author(s):  
WANG XU ◽  
WANG CHENCHONG ◽  
CHEN GUOQIN ◽  
YANG WENSHU ◽  
ZHANG ZHICHAO
Keyword(s):  
Contact Angle ◽  
Carbon Fiber ◽  
Sessile Drop ◽  
Contact Angles ◽  
Mg Alloys ◽  
Holding Time ◽  
Dominant Effect ◽  
Wetting Behavior ◽  
Fiber Fabric ◽  
Al Mg Alloys

In present work, the wetting behavior of carbon fiber and Al – Mg alloys (up to 17 wt.%) from 700°C to 1000°C was investigated by sessile drop method. Below 900°C, the contact angles decreased slightly with increase of temperature regardless of Mg amount. However, the contact angles decreased sharply at elevated temperature (above 900°C). Moreover, below 900°C, the contact angles decreased slightly with holding time, and significant decrease of contact angle with increase of holding time was found above 1000°C. All contact angle-holding time curves at 1000°C demonstrated three kinetic stages. It is observed that the contact angles decreased with Mg amount regardless of wetting temperature. The addition of Mg element will inhabit the nucleation and growth of Al 4 C 3 phase, which is unfavorable to the wetting behavior. However, the addition of Mg element will also decrease the surface energy, which demonstrates dominant effect and leads to the decrease of contact angles.

scholarly journals Aluminum Melt Filtration with Carbon Bonded Alumina Filters

Materials ◽  
2020 ◽  
Vol 13 (18) ◽  
pp. 3962
Author(s):  
Claudia Voigt ◽  
Jana Hubálková ◽  
Tilo Zienert ◽  
Beate Fankhänel ◽  
Michael Stelter ◽  
...  
Keyword(s):  
Contact Angle ◽  
Sessile Drop ◽  
Contact Angles ◽  
Apparent Contact Angle ◽  
Drop Test ◽  
Aluminum Melt ◽  
Wetting Behavior ◽  
Purification Unit ◽  
Conventional Test ◽  
Porous Disc

The wetting behavior was measured for Al2O3-C in contact with AlSi7Mg with a conventional sessile drop test (vacuum, 950 °C and 180 min) and a sessile drop test with a capillary purification unit (vacuum, 730 °C and 30 min). The conventional test yielded contact angles of around 92°, whereas the sessile drop measurement with capillary purification showed a strongly non-wetting behavior with a determined apparent contact angle of the rolling drop of 157°. Filtration tests, which were repeated twice, showed that the Al2O3-C filter possessed a better filtration behavior than the Al2O3 reference filter. For both filtration trials, the PoDFA (porous disc filtration analysis) index of the Al2O3-C filter sample was equal to half of the PoDFA index of the Al2O3 reference filter sample, indicating a significantly improved filtration performance when using Al2O3-C filter. Notable is the observation of a newly formed layer between the aluminum and the Al2O3-C coating. The layer possessed a thickness between 10 µm up to 50 µm and consisted of Al, C, and O, however, with different ratios than the original Al2O3-C coating. Thermodynamic calculations based on parameters of the wetting and filtration trials underline the possible formation of an Al4O4C-layer.

Interfacial tension of liquids from the height and contact angle of a single sessile drop

1988 ◽  
Vol 266 (9) ◽  
pp. 849-854 ◽  
Author(s):  
K. S. Birdi ◽  
D. T. Vu ◽  
A. Winter
Keyword(s):  
Contact Angle ◽  
Interfacial Tension ◽  
Sessile Drop

Influence of Bivalent Ion on Oil/Water Interfacial Properties

2014 ◽  
Vol 1033-1034 ◽  
pp. 486-490
Author(s):  
Hai Yan Zhang
Keyword(s):  
Contact Angle ◽  
Interfacial Tension ◽  
Surfactant Solution ◽  
Interfacial Properties ◽  
Contact Angles ◽  
Naoh Solution ◽  
Minimal Contact ◽  
Oil Water

The interfacial tension (IFT) and contact angles of different oil/solutions were compared to unveil the influence of Mg2+on oil/NaOH interfacial properties. The results demonstrate that adding Mg2+to NaOH solution cannot change the oil/NaOH interfacial tension when enough OH-is provided. While for NaOH-surfactant solution, adding Mg2+changes the IFT dramatically. Adding NaOH to oil/water produces a minimal contact angle at NaOH of 0.02wt%. Adding surfactant or MgCl2alone increases the contact angles. Adding them together produces a synergism to bringing down contact angles gradually with the increase of NaOH concentration. The change of salinity and the reaction among them may be responsible for the influence and synergism.

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