Journal ArticleDOI
An analysis of the sensitivity of pendant drops and liquid bridges to measure the interfacial tension
Reads0
Chats0
TLDR
In this article, the authors analyzed the advantages of using liquid bridges close to the minimum volume stability limit instead of pendant drops to measure the interfacial tension under different experimental conditions and demonstrated that the use of liquid bridges enhances the range of Bond numbers for which drop shape techniques work satisfactorily.Abstract:
Drop shape techniques, such as axisymmetric drop shape analysis, provide accurate measurements of the interfacial tension from images of pendant drops for a wide variety of experimental conditions. However, these techniques are known to fail when dealing with nearly spherical drop shapes, which may occur, for instance, when working with interfaces between liquids of similar densities and/or under microgravity. We analyzed the advantages of using liquid bridges close to the minimum volume stability limit instead of pendant drops to measure the interfacial tension under different experimental conditions. First, the sensitivity of both configurations to a variation of the interfacial tension is studied numerically as a function of the volume for several Bond numbers B. The results indicate that a liquid bridge close to the minimum volume stability limit is generally more sensitive than a pendant drop of the same volume, especially for small values of the density difference across the interface and/or gravity. This suggests that the use of liquid bridges may extend the range of applicability of drop shape techniques. To explore this possibility, synthetic images of both pendant drops and liquid bridges were generated and then processed by TIFA-AI. The results demonstrated that the use of liquid bridges enhances the range of Bond numbers for which drop shape techniques work satisfactorily. More specifically, similar accuracy is obtained from both configurations for B ~ 10−1, while the use of liquid bridges yields much better results for B ~ 10−2. Finally, experiments were conducted to partially validate the analysis based on synthetic images. Good agreement was found between the values determined from the real and synthetic images.read more
Citations
More filters
Journal ArticleDOI
Measurement of surface and interfacial tension using pendant drop tensiometry
Joseph D. Berry,Joseph D. Berry,Michael J Neeson,Raymond R. Dagastine,Raymond R. Dagastine,Derek Y. C. Chan,Derek Y. C. Chan,Richard Francis Tabor +7 more
TL;DR: The process involved with going from a captured experimental image to a fitted interfacial tension value is discussed, highlighting pertinent features and limitations along the way and a new parameter, the Worthington number, Wo, is introduced to characterise the measurement precision.
Journal ArticleDOI
Design and accuracy of pendant drop methods for surface tension measurement
TL;DR: In this paper, the design and accuracy of pendant drop methods are considered in detail and a quantitative criterion called shape parameter is then used to express quantitatively the difference in shape between a given experimental drop and a spherical shape.
Journal ArticleDOI
Axisymmetric Drop Shape Analysis (ADSA): An Outline.
TL;DR: A streamlined version of the development of ADSA over the past several decades is presented to illustrate its validity and range of utility.
Journal ArticleDOI
Methodology for high accuracy contact angle measurement.
TL;DR: It was found that using an accurate value of surface tension as an input enhances the accuracy of contact angle measurements, and sources of improvement in contact angle resolution were explored.
Journal ArticleDOI
Effects of TiO2, MgO, and γ-Al2O3 nano-particles in carbonated water on water-oil interfacial tension (IFT) reduction in chemical enhanced oil recovery (CEOR) process
TL;DR: In this article, Axisymmetric Drop Shape Analysis (ADSA) was applied to investigate the ability of a hybrid technique, i.e., the simultaneous use of TiO2, MgO, and γ-Al2O3 nanoparticles and carbonated formation water as an available water source in reducing interfacial tension (IFT) as a main EOR mechanism.
References
More filters
Journal ArticleDOI
Automation of axisymmetric drop shape analysis for measurements of interfacial tensions and contact angles
TL;DR: An automatic digitization technique utilizing recent developments in digital image acquisition and analysis to achieve rapid and accurate data acquisition and preprocessing is presented and it was found that high accuracy could be obtained through the use of sub-pixel resolution in determining the drop profile coordinates.
Journal ArticleDOI
Axisymmetric Drop Shape Analysis: Computational Methods for the Measurement of Interfacial Properties from the Shape and Dimensions of Pendant and Sessile Drops
O.I. del Rio,A. W. Neumann +1 more
TL;DR: State-of-the-art axisymmetric drop shape analysis techniques for the computation of interfacial tensions and contact angles by fitting the Laplace equation of capillarity to the shape and dimensions of pendant and sessile drops are presented.
Journal ArticleDOI
Determination of interfacial tension from the profile of a pendant drop using computer-aided image processing. 1. Theoretical
Bihai Song,Jürgen Springer +1 more
TL;DR: It was found that the tilt of the drop profiles may lead to large errors in the resultant IFT values if the tilt was not corrected before or during the optimization procedure, which could be reduced drastically if a profile were averaged between its two sides and the mean profile were used for optimization.
Journal ArticleDOI
Determination of Surface Tension and Contact Angle from the Shapes of Axisymmetric Fluid Interfaces without Use of Apex Coordinates
TL;DR: In this paper, a new methodology is presented for measuring interfacial properties of liquids, such as surface tension and contact angles, by analyzing the shape of an axisymmetric liquid-fluid interface without use of apex coordinates.
Journal ArticleDOI
The Determination of Interfacial Tension by Video Image Processing of Pendant Fluid Drops.
TL;DR: In this paper, a novel technique is presented for the determination of interfacial tension by analysis of axisymmetric fluid drop profiles, which couples recent developments in digital image acquisition and processing with modern methods for robust shape comparison.
Related Papers (5)
Axisymmetric Drop Shape Analysis: Computational Methods for the Measurement of Interfacial Properties from the Shape and Dimensions of Pendant and Sessile Drops
O.I. del Rio,A. W. Neumann +1 more