Surface tension of binary solutions of non-electrolytes. V. Measurement of surface tensions of non-electrolyte solutions by means of a modified method of capillary rise

1970 ◽  
Vol 35 (9) ◽  
pp. 2702-2711 ◽  
Author(s):  
M. Šišková ◽  
V. Šecová
Keyword(s):  
Surface Tension ◽  
Capillary Rise ◽  
Electrolyte Solutions ◽  
Surface Tensions ◽  
Binary Solutions ◽  
Modified Method

scholarly journals Comparison of Surface Tension Models for the Volume of Fluid Method

Processes ◽  
2019 ◽  
Vol 7 (8) ◽  
pp. 542 ◽  
Author(s):  
Kurian J. Vachaparambil ◽  
Kristian Etienne Einarsrud
Keyword(s):  
Surface Tension ◽  
Multiphase Flow ◽  
Capillary Rise ◽  
Surface Tension Force ◽  
Surface Force ◽  
Parallel Plates ◽  
Time Step ◽  
Mesh Resolution ◽  
Active Research ◽  
Spurious Currents

With the increasing use of Computational Fluid Dynamics to investigate multiphase flow scenarios, modelling surface tension effects has been a topic of active research. A well known associated problem is the generation of spurious velocities (or currents), arising due to inaccuracies in calculations of the surface tension force. These spurious currents cause nonphysical flows which can adversely affect the predictive capability of these simulations. In this paper, we implement the Continuum Surface Force (CSF), Smoothed CSF and Sharp Surface Force (SSF) models in OpenFOAM. The models were validated for various multiphase flow scenarios for Capillary numbers of 10 − 3 –10. All the surface tension models provide reasonable agreement with benchmarking data for rising bubble simulations. Both CSF and SSF models successfully predicted the capillary rise between two parallel plates, but Smoothed CSF could not provide reliable results. The evolution of spurious current were studied for millimetre-sized stationary bubbles. The results shows that SSF and CSF models generate the least and most spurious currents, respectively. We also show that maximum time step, mesh resolution and the under-relaxation factor used in the simulations affect the magnitude of spurious currents.

Measurement of Burst Pressure of Capillary Burst Valve

2010 ◽  
Author(s):  
Hong Chen ◽  
Toru Yamada ◽  
Mohammad Faghri
Keyword(s):  
Surface Tension ◽  
Solid Surface ◽  
Burst Pressure ◽  
Surface Tensions ◽  
Fluid Surface ◽  
Mechanical Components

Capillary burst valve (CBV), a counterpart to an elastomeric diaphragm microvalve, handles fluid in microchannels by capillarity. Thus, it avoids integration of mechanical components. We experimentally estimated the burst pressure, beyond which CBV cannot hold fluid, using fluids with distinct surface tensions in CBVs grafted with distinct surface constitutions in microchannels. We found that both the fluid surface tension and the solid surface constitution influence the burst pressure. The burst pressure reduces more significantly under the influence of the fluid surface tension.

scholarly journals Sorting Liquid Droplets by Surface Tension Using Devices with Quasi-Superamphiphobic Coatings

Polymers ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 820 ◽  
Author(s):  
Yu-Ping Zhang ◽  
Di Fan ◽  
Xiu-Zhi Bai ◽  
Cheng-Xing Cui ◽  
Jun Chen ◽  
...  
Keyword(s):  
Surface Tension ◽  
Surface Energy ◽  
Solid Surface ◽  
Glass Slide ◽  
Liquid Droplets ◽  
Surface Tensions ◽  
Coated Nanoparticles ◽  
Tilting Angle ◽  
Time Distance ◽  
Alcoholic Strength

Any solid surface with homogenous or varying surface energy can spontaneously show variable wettability to liquid droplets with different or identical surface tensions. Here, we studied a glass slide sprayed with a quasi-superamphiphobic coating consisting of a hexane suspension of perfluorosilane-coated nanoparticles. Four areas on the glass slide with a total length of 7.5 cm were precisely tuned via ultraviolet (UV) irradiation, and droplets with surface tensions of 72.1–33.9 mN m−1 were categorized at a tilting angle of 3°. Then, we fabricated a U-shaped device sprayed with the same coating and used it to sort the droplets more finely by rolling them in the guide groove of the device to measure their total rolling time and distance. We found a correlation between ethanol content/surface tension and rolling time/distance, so we used the same device to estimate the alcoholic strength of Chinese liquors and to predict the surface tension of ethanol aqueous solutions.

SURFACE TENSION OF He3

1955 ◽  
Vol 33 (2) ◽  
pp. 49-53 ◽  
Author(s):  
D. R. LoveJoy
Keyword(s):  
Surface Tension ◽  
Critical Temperature ◽  
Liquid Helium ◽  
Capillary Rise ◽  
Capillary Rise Method

The surface tension of He3 has been measured by a capillary rise method between 1.08° and 2.32°K. A decrease of more than 50% was observed in this range and this supports the ideas on which Atkins' theory of the surface tension of liquid helium is based. On the basis of this theory the surface tension has been extrapolated to 0°K., where it has the value 0.154 ± 0.005 erg cm.−2. Above 2.3°K. it was extrapolated linearly to zero at the critical temperature. The Eötvös constant was calculated to be about 0.8.

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