Effect of rheology and interfacial tension on spreading of emulsion drops impacting a solid surface

2021 ◽  
Vol 33 (8) ◽  
pp. 083309
Author(s):  
M. Piskunov ◽  
A. Semyonova ◽  
N. Khomutov ◽  
A. Ashikhmin ◽  
V. Yanovsky
Keyword(s):  
Interfacial Tension ◽  
Solid Surface ◽  
Emulsion Drops

Capillarity, wetting, and surface (interfacial) tension

Surfactants ◽  
2019 ◽  
pp. 25-52
Author(s):  
Bob Aveyard
Keyword(s):  
Contact Angle ◽  
Interfacial Tension ◽  
Solid Surface ◽  
Vapour Pressure ◽  
Pressure Difference ◽  
Capillary Tube ◽  
Intermolecular Forces ◽  
Liquid Interface ◽  
Interfacial Tensions ◽  
Drop Radius

Capillarity reflects the action of interfacial tension and has been central to understanding intermolecular forces. When a liquid meets a solid surface (with contact angle θ‎) it forms a meniscus which is associated with the rise/depression of liquid in a capillary tube, hence the term capillarity. Interfacial tensions also determine how a liquid wets and adheres to a solid or another liquid. Liquid menisci are curved, and Young, Laplace, and Kelvin have all thrown light upon the properties of curved liquid surfaces. The Young–Laplace equation relates the pressure difference across a curved liquid interface to both the interfacial tension and curvature of the interface. Interfacial tension also gives rise to a dependence of the vapour pressure (and solubility) of a liquid on the curvature of its surface (e.g. drop radius), as expressed in the Kelvin equation. Common methods for measurement of interfacial tensions are described in an Appendix.

The Modeling of Interfacial Contacts in Composites Using the Sitting Drop - Solid Body System as an Example

2020 ◽  
Vol 869 ◽  
pp. 400-407
Author(s):  
Аleksey A. Ignatiev ◽  
Valeriy M. Gotovtsev ◽  
Denis V. Gerasimov ◽  
Pavel B. Razgovorov
Keyword(s):  
Surface Tension ◽  
Interfacial Tension ◽  
Solid Surface ◽  
Interface Layer ◽  
Body System ◽  
Pressure Tensor ◽  
Phase Contact ◽  
Interfacial Tensions ◽  
Three Phase ◽  
The Subject

The paper presents an analysis of positions, which a theory of a liquid wetting a solid surface is based on, using the sitting drop equilibrium as an example. Certain inconsistencies are indicated in these positions, which is the subject of the discussion. The paper explains why the interfacial tension of solid-gas has no effect on the equilibrium of a drop. It proposes a mechanism to form a liquid-solid interface layer, the tensor of interfacial tensions of which is represented as a pressure tensor. It is established that the surface tension of the interface layer is variable and changes in magnitude and direction depending on the wetting conditions. It is determined that it is not possible to present a range of phenomena accompanying the wetting of a solid surface with a liquid by examining the equilibrium of a three-phase contact line.

Impact of emulsion drops on a solid surface: The effect of viscosity

2019 ◽  
Vol 31 (10) ◽  
pp. 102106 ◽  
Author(s):  
Amrit Kumar ◽  
Deepak Kumar Mandal
Keyword(s):  
Solid Surface ◽  
Emulsion Drops

Microwave resonance method for measuring microliter volumes of free moisture in aviation fuels

2020 ◽  
pp. 49-56
Author(s):  
Vitaly V. Volkov ◽  
Michael A. Suslin ◽  
Jamil U. Dumbolov
Keyword(s):  
Solid Surface ◽  
Free Water ◽  
Resonance Method ◽  
Cavity Resonator ◽  
Maximum Error ◽  
Aviation Fuel ◽  
Fuel Quality ◽  
Microwave Resonance ◽  
Free Moisture ◽  
Microwave Losses

One of the conditions for ensuring the safety of air transport operation is the quality of aviation fuel refueled in aircraft. Fuel quality control is a multi-parameter task that includes monitoring the free moisture content. Regulatory documents establish the content of free water no more than 0.0015% by weight. It is developed a direct electrometric microwave resonance method for controlling free moisture in aviation fuels, which consists in changing the shape of the water drops by pressing them on a solid surface inside a cylindrical cavity resonator. This can dramatically increase dielectric losses. Analytical and experimental analysis of the proposed method is carried out. The control range from 0,5 to 30 μl of absolute volume of moisture in aviation fuels with a maximum error of not morethan 25 % is justified. The sensitivity of the proposed method for monitoring microwave losses in free moisture drops transformed into a thin layer by pressing is an order of magnitude greater than the sensitivity of the method for monitoring microwave losses in moisture drops on a solid surface in a resonator. The proposed method can be used as a basis for the development of devices for monitoring the free moisture of aviation fuels in the conditions of the airfield and laboratory. The direction of development of the method is shown.

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