Results 251 to 260 of about 158,723 (299)
Some of the next articles are maybe not open access.
Surface tension measurement of oil/refrigerant mixture by maximum bubble pressure method
International Journal of Refrigeration, 2017Abstract Lubrication oil used in refrigerant compressors forms oil mist in the compressor shell. Some of the oil mist is discharged into a refrigeration cycle with refrigerant and causes degradation of heat transfer in heat exchangers. Since the generation of the oil mist is related to the Weber number, it is necessary to measure the surface tension ...
Mitsuhiro Fukuta +3 more
openaire +1 more source
Adsorption kinetics at air/solution interface studied by maximum bubble pressure method
Colloid and Polymer Science, 2004A general dynamic surface adsorption equation Γ(t) for maximum bubble pressure method was derived by solving Fick’s diffusion equation for the bubbles under different initial and boundary conditions. Different from the planar surface adsorption(Ward-Tordai equation), the derived dynamic surface adsorption Γ(t) for the short time consists of two terms ...
Junji Liu, Chuangye Wang, Ulf Messow
openaire +1 more source
The maximum bubble pressure method of measuring surface tension, revisited
Colloids and Surfaces, 1990Abstract The maximum bubble pressure method can give precise and accurate values of the equilibrium surface tension as well as of the dynamic surface tension at clearly defined bubble ages as given by the bubble intervals. Each bubble samples a fresh, substantially clean surface and the sensitivity can be mdyn cm−1.
openaire +1 more source
Unusual Characteristics of the Maximum Bubble Pressure Method Using a Teflon Capillary
Journal of Colloid and Interface Science, 1994Abstract The maximum bubble pressure method has been used recently in a continuous-bubbling mode to measure the dynamic surface tension of surfactant solutions at varying bubble frequencies. A modification of this method, which utilizes a syringe pump supplying gas at controlled rates, has been developed to examine bubble growth by providing an ...
Cheryl P. Hallowell, Douglas E. Hirt
openaire +1 more source
Dynamic surface tension determination with the maximum bubble pressure method
Journal of Colloid and Interface Science, 1971Abstract The surface tension of surfactant solutions can be observed conveniently as a function of time in the 1- to 100-sec range with some modifications of the normal maximum bubble pressure method. Dynamic surface tensions are compared with equilibrium values for dimethyldecylphosphine oxide, dimethyldodecylphosphine oxide, dimethyldodecylamine ...
openaire +1 more source
Dynamic surface tension of micellar solutions studied by the maximum bubble pressure method
Colloid and Polymer Science, 1995A theoretical model for the dynamic surface tension of an air bubble expanding in micellar surfactant solution is proposed. The model accounts for the effect of expansion of the bubble surface during the adsorption of surfactant molecules (monomers) and the effect of disintegration of polydisperse micelles on the surfactant diffusion.
C. D. Dushkin +2 more
openaire +1 more source
Dynamic Surface Tension of Micellar Triton X-100 Solutions by the Maximum-Bubble-Pressure Method
Journal of Colloid and Interface Science, 1994Abstract The dynamic maximum-bubble-pressure method was used to measure the dynamic surface tension of Triton X-100 solutions (at the CMC and at concentrations above the CMC). Measurements were performed at 30.0, 40.0, 50.0, and 60.0°C. The results at 30.0°C are in excellent agreement with the data obtained through other methods (oscillating jet and ...
Makievski, A.V. +2 more
openaire +2 more sources
Colloids and Surfaces A: Physicochemical and Engineering Aspects, 1993
Abstract A newly designed apparatus based on the principle of maximum bubble pressure can be used for measuring the dynamic surface tension in a time interval from 1 ms to 10 s. The surface tension values for pure liquids obtained at small lifetimes are influenced by hydrodynamic effects.
Fainerman, V., Makievski, A., Miller, R.
openaire +2 more sources
Abstract A newly designed apparatus based on the principle of maximum bubble pressure can be used for measuring the dynamic surface tension in a time interval from 1 ms to 10 s. The surface tension values for pure liquids obtained at small lifetimes are influenced by hydrodynamic effects.
Fainerman, V., Makievski, A., Miller, R.
openaire +2 more sources
Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2004
One of the essential differences in the design of bubble pressure tensiometers consists in the geometry of the measuring capillaries. To reach extremely short adsorption times of milliseconds and below, the so-called deadtime of the capillaries must be of the order of some 10 ms.
Fainerman, V. +4 more
openaire +2 more sources
One of the essential differences in the design of bubble pressure tensiometers consists in the geometry of the measuring capillaries. To reach extremely short adsorption times of milliseconds and below, the so-called deadtime of the capillaries must be of the order of some 10 ms.
Fainerman, V. +4 more
openaire +2 more sources
Journal of Colloid and Interface Science, 1989
Abstract The maximum bubble pressure method for measuring dynamic surface tension is reexamined, using high speed cinematography, particularly with respect to the process of bubble formation and the determination of the true surface age. A method for direct measurement of the time of bubble growth is suggested which readily permits routine ...
Peter R Garrett, David R Ward
openaire +1 more source
Abstract The maximum bubble pressure method for measuring dynamic surface tension is reexamined, using high speed cinematography, particularly with respect to the process of bubble formation and the determination of the true surface age. A method for direct measurement of the time of bubble growth is suggested which readily permits routine ...
Peter R Garrett, David R Ward
openaire +1 more source