Measurement of interfacial tension by use of pendant drop video techniques

Abstract

This report describes an instrument to measure the interfacial tension (IFT) of aqueous surfactant s_lutions and crude oil. The method involves injection of a drop of fluid (such as crude oil) into a second immiscible phase to determine the IFT between the two phases. The instrument is composed of an ATclass computer, optical cell, illumination, video camera and lens, video frame digitizer board, monitor, and software. The camera displays an image of the pendant drop on the monitor, which is then processed by the frame digitizer board and non-proprietary software to determine the IFT. Several binary and ternary phase systems were taken from the literature and used to measure the precision and accuracy of the instrument in determining IFTs. A copy of the software program is included in the report. A copy of the program on diskette can be obtained from the

Development of robust model to estimate gas–oil interfacial tension using least square support vector machine: Experimental and modeling study

“…The interfacial tension showed a pronounced dependence on pressure and temperature. For a gas condensate, by decreasing temperature IFT is expected to decrease, but for an oil sample by decreasing temperature IFT is expected to increase [7][8][9].…”