scholarly journals Surface tension coefficient of liquid sensor based on FBG

2021 ◽  
pp. 100204
Author(s):  
Yalan Niu ◽  
Hanglin Lu ◽  
Li Yang ◽  
Laipeng Shao ◽  
Junhui Hu
Keyword(s):  
Surface Tension ◽  
Surface Tension Coefficient

scholarly journals Improvement of acid solutions for stimulation of compacted high-temperature carbonate collectors

2021 ◽  
Vol 6 (3(62)) ◽  
pp. 11-14
Author(s):  
Oleh Zimin
Keyword(s):  
Surface Tension ◽  
Acetic Acid ◽  
High Temperature ◽  
Reaction Rate ◽  
Methyl Acetate ◽  
Surface Tension Coefficient ◽  
Gradual Transition ◽  
Acid Solutions ◽  
Hydrocarbon Production ◽  
Low Viscosity

The object of research in this work is the intensification of hydrocarbon production. The most problematic task of the study is the efficiency of intensification of compacted high-temperature carbonate reservoirs. Despite the gradual transition to renewable energy sources, natural gas and oil will play a dominant role in the world's energy balance in the next 20–30 years. Carbonate rocks have significant mining potential, but low filtration properties require intensification to improve reservoir permeability. High temperatures and pressures at great depths require the improvement of existing hydrocarbon production technologies. The most popular method for treating reservoirs containing carbonates is acid treatments in different variations, but for effective treatment it is necessary to achieve deep penetration of the solution into the formation. The study solves the problem of selection of effective carrier liquids for the preparation of acid solutions for the treatment of compacted high-temperature reservoirs with high carbonate content. To ensure quality treatment, acid solutions must have low viscosity and surface tension coefficient, low reaction rate, their chemical properties must ensure the absence of insoluble precipitates in the process of reactions with fluids and rocks, as well as be environmentally friendly. To select the most optimal carrier liquid, experiments were conducted to determine which candidate liquids provide the minimum reaction rate of acidic solutions with carbonates. Based on the analysis of industrial application data and literature sources, water, nephras, methanol, ethyl acetate, and methyl acetate were selected for further research. Widely studied acetic acid was chosen as the basic acid. Studies have shown that methyl acetate has a number of advantages, namely low reaction rate, low viscosity and surface tension coefficient. As well as the possibility of hydrolysis in the formation with the release of acetic acid, which significantly prolongs the reaction time of the solution with the rock and the depth of penetration of the active solution into the formation.

Experimental Study of Surface Tension Coefficient for Magnetic Fluid

2011 ◽  
Vol 492 ◽  
pp. 277-282
Author(s):  
Qing Lei Wang ◽  
De Cai Li ◽  
Fan Wang
Keyword(s):  
Surface Tension ◽  
Magnetic Fluid ◽  
Liquid Surface ◽  
Surface Tension Coefficient ◽  
Fluid Surface ◽  
Liquid Surface Tension ◽  
Experimental Apparatus ◽  
Different Temperatures ◽  
Increasing Temperature ◽  
The Relationship

The author measured surface tension coefficient for liquid with a new experimental apparatus, measured magnetic fluid surface tension coefficient at different temperatures and with different volume of surfactant. By the analysis of experimental data, we obtained that magnetic fluid surface tension coefficient decreases with the increasing temperature and increases with the addition of surfactant volume and reaches a certain stability value. We also obtained the expression of magnetic fluid surface tension coefficient and the temperature or surfactant. This paper discussed the relationship between the liquid surface tension coefficient and the temperature and surfactant from the view of thermodynamics.

Stability and bifurcation analysis of a free boundary problem modelling multi-layer tumours with Gibbs–Thomson relation

2015 ◽  
Vol 26 (4) ◽  
pp. 401-425 ◽  
Author(s):  
FUJUN ZHOU ◽  
JUNDE WU
Keyword(s):  
Surface Tension ◽  
Free Boundary ◽  
Boundary Problem ◽  
Stationary Solution ◽  
Free Boundary Problem ◽  
Bifurcation Analysis ◽  
Surface Tension Coefficient ◽  
Stability And Bifurcation ◽  
Stability And Bifurcation Analysis ◽  
A Free Boundary Problem

Of concern is the stability and bifurcation analysis of a free boundary problem modelling the growth of multi-layer tumours. A remarkable feature of this problem lies in that the free boundary is imposed with nonlinear boundary conditions, where a Gibbs–Thomson relation is taken into account. By employing a functional approach, analytic semigroup theory and bifurcation theory, we prove that there exists a positive threshold value γ* of surface tension coefficient γ such that if γ > γ* then the unique flat stationary solution is asymptotically stable under non-flat perturbations, while for γ < γ* this unique flat stationary solution is unstable and there exists a series of non-flat stationary solutions bifurcating from it. The result indicates a significant phenomenon that a smaller value of surface tension coefficient γ may make tumours more aggressive.

Research of Monitoring Deterioration of Milk by Using Surface Tension Coefficient and Viscosity

2012 ◽  
Vol 455-456 ◽  
pp. 467-470
Author(s):  
Zhi Jie Mai ◽  
Fang Lin ◽  
Jian Ming Fan
Keyword(s):  
Surface Tension ◽  
Experimental Results ◽  
Surface Tension Coefficient ◽  
Light Transmittance ◽  
Physical Parameters ◽  
Natural Medium

Nutrient-rich milk is the natural medium, easy to spoilage. Some physical parameters will change with milk deterioration such as density, viscosity, surface tension coefficient, light transmittance, etc. Detecting these physical parameters is useful to monitoring the deteriorate degree of milk. This article focuses on the surface tension efficient and viscosity of milk by monitoring its deteriorate process. The experimental results show that deterioration of milk is indeed accompanied with the change of surface tension coefficient and viscosity. In compare with surface tension coefficient, viscosity dramatically change after deterioration.

Discussion on the measurement of the surface tension coefficient by the pull-off method

2016 ◽  
Vol 37 (2) ◽  
pp. 025801 ◽  
Author(s):  
Lei Tang ◽  
Guan-nan Liu ◽  
Jun Qian ◽  
Qian Sun ◽  
Chun-ling Zhang
Keyword(s):  
Surface Tension ◽  
Surface Tension Coefficient
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