China
Africa
Explore chapters and articles related to this topic
Interfaces and the Concept of Surface Tension
Published in Andrew Terhemen Tyowua, Liquid Marbles, 2018
The maximum bubble pressure method has been used to measure interfacial tension for many years and has now been modified to measure even dynamic (i.e. non-equilibrated) interfacial tension. In the maximum bubble pressure method (Figure 1.5), the maximum pressure Pmax needed to force a gas bubble out of a capillary tube of radius Rc into a liquid is measured. The Pmax is equal to the sum of the capillary pressure ΔP caused by the interfacial tension and the hydrostatic pressure (ρgh) caused by the liquid column above the orifice of the capillary as shown in Equation (1.19).
Droplet impingement method to measure the surface tension of molten zirconium oxide
Published in Journal of Nuclear Science and Technology, 2020
Toshiki Kondo, Hiroaki Muta, Yuji Ohishi
The surface tension is usually measured using methods such as the sessile drop method [7], maximum bubble pressure method [8], and pendant drop method [9]. Although these methods can facilitate the determination of the surface tension, the measurement cannot be performed at a high temperature because the molten oxides melt or react with the component of the apparatus, thereby affecting the result of the measurement [10]. Recently, contactless methods have been improved, and some research groups have reported on the surface tension of molten oxides by using the aerodynamic levitation system (ADL) [11,12]. However, conventional ADL methods involve considerably long time (approximately a few minutes) to measure the surface tension because five resonant frequencies must be determined to evaluate the surface tension accurately [13]. The surface tension evaluated using only one resonant frequency is said to be underestimated by approximately 20% [12]. This aspect indicates that the ADL method is not suitable for measuring the surface tension of materials with high vapor pressure such as ZrO2 [14].
Characterization Techniques of Flotation Frothers - A Review
Published in Mineral Processing and Extractive Metallurgy Review, 2023
Hamid Khoshdast, Ahmad Hassanzadeh, Przemyslaw B. Kowalczuk, Saeed Farrokhpay
Two methods commonly used to measure the dynamic surface tension are the maximum bubble pressure and oscillating jet. The most common way is the maximum bubble pressure method (developed ca. 150 years ago), which is even now considered as a reliable and robust method for measuring DST, principally at short times, or the surface of bubbles, which is a significant feature in the assessment of typical flotation frothers. The schematic illustration of this method and detailed information can be found elsewhere (Comley et al. 2002; Jávor, Schreithofer and Heiskanen 2012).