Refractive index effects in pendant drop tensiometry
File(s)
Published version
Author(s)
Pan, Ziqing
Trusler, JP Martin
Type
Journal Article
Abstract
An optical model is established to investigate the effects of refractive index changes on the measurement of interfacial tension by the pendant drop method with axisymmetric drop shape analysis. In such measurements, light passes from the pendant drop through a surrounding bulk phase, an optical window and air to reach the lens of the camera system. The relation between object and image size is typically determined by calibration and, if the refractive indices of any of the materials in the optical path change between calibration and measurement, a correction should be made. The simple model derived in this paper allows corrections to be calculated along with the corresponding contribution to the overall uncertainty of the interfacial tension. The model was verified by measurements of the interfacial tension between decane and water under two different calibration conditions. Neglect of the correction was shown to cause errors of up to 6 % when the bulk phase changed from air (during calibration) to water (during measurements) and of about 9 % when the system was calibrated without the optical window used for the final measurements. The refraction changes due to high pressures and supercritical fluid states can also lead to measurement errors. The proposed model can facilitate more accurate interfacial tension measurements and reduce the amount of repetitive calibration work required.
Date Issued
2022-05-01
Date Acceptance
2022-02-16
Citation
International Journal of Thermophysics, 2022, 43 (5), pp.1-14
ISSN
0195-928X
Publisher
Springer
Start Page
1
End Page
14
Journal / Book Title
International Journal of Thermophysics
Volume
43
Issue
5
Copyright Statement
© The Author(s) 2022.
Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.
Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.
License URL
Identifier
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000761325700001&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
Subjects
Science & Technology
Physical Sciences
Technology
Thermodynamics
Chemistry, Physical
Mechanics
Physics, Applied
Chemistry
Physics
Axisymmetric drop shape analysis
Calibration
Interfacial tension
Refractive index
INTERFACIAL-TENSION
SURFACE-TENSION
SHAPE-ANALYSIS
LIQUID-METALS
WATER
TEMPERATURE
PRESSURE
DENSITY
CO2
INSTRUMENT
Publication Status
Published
Article Number
ARTN 65
Date Publish Online
2022-02-26