A Liquid Water Model That Explains the Variation of Surface Tension of Water with Temperaure

2001 ◽  
Vol 40 (Part 1, No. 3A) ◽  
pp. 1467-1471 ◽  
Author(s):  
Arshad Khan ◽  
M. Rezwan Khan ◽  
M. Ferdouse Khan ◽  
Fahima Khanam
Keyword(s):  
Surface Tension ◽  
Liquid Water ◽  
Water Model

A stationary circular hydraulic jump, the limits of its existence and its gasdynamic analogue

2008 ◽  
Vol 601 ◽  
pp. 189-198 ◽  
Author(s):  
ASLAN R. KASIMOV
Keyword(s):  
Surface Tension ◽  
Hydraulic Jump ◽  
Stokes Equations ◽  
Critical Value ◽  
Water Model ◽  
Navier Stokes ◽  
Jump Conditions ◽  
Shallow Water Model ◽  
Finite Radius ◽  
Navier Stokes Equations

We propose a theory of a steady circular hydraulic jump based on the shallow-water model obtained from the depth-averaged Navier–Stokes equations. The flow structure both upstream and downstream of the jump is determined by considering the flow over a plate of finite radius. The radius of the jump is found using the far-field conditions together with the jump conditions that include the effects of surface tension. We show that a steady circular hydraulic jump does not exist if the surface tension is above a certain critical value. The solution of the problem provides a basis for the hydrodynamic stability analysis of the hydraulic jump. An analogy between the hydraulic jump and a detonation wave is pointed out.

scholarly journals Surface tension of ab initio liquid water at the water-air interface

2016 ◽  
Vol 144 (20) ◽  
pp. 204705 ◽  
Author(s):  
Yuki Nagata ◽  
Tatsuhiko Ohto ◽  
Mischa Bonn ◽  
Thomas D. Kühne
Keyword(s):  
Surface Tension ◽  
Ab Initio ◽  
Liquid Water ◽  
Air Interface

scholarly journals Accurate Simulations of Lipid Monolayers Require a Water Model With Correct Surface Tension

2021 ◽  
Author(s):  
Carmelo Tempra ◽  
O.H. Samuli Ollila ◽  
Matti Javanainen
Keyword(s):  
Molecular Dynamics ◽  
Surface Tension ◽  
Molecular Dynamics Simulations ◽  
Long Range ◽  
Van Der Waals ◽  
Water Model ◽  
Lipid Monolayers ◽  
Experimental Surface ◽  
Water Models ◽  
Dynamics Simulations

Lipid monolayers provide our lungs and eyes their functionality, and serve as proxy systems in biomembrane research. Therefore, lipid monolayers have been studied intensively also using molecular dynamics simulations, which are able to probe their lateral structure and interactions with, e.g., pharmaceuticals or nanoparticles. However, such simulations have struggled in describing the forces at the air–water interface. Particularly the surface tension of water and long-range van der Waals interactions have been considered critical, but their importance in monolayer simulations has been evaluated only separately. Here we combine the recent C36/LJ-PME lipid force field that in- cludes long-range van der Waals forces with water models that reproduce experimental surface tensions to elucidate the importance of these contributions in monolayer simulations. Our results suggest that a water model with correct surface tension is necessary to reproduce experimental surface pressure–area isotherms and monolayer phase behavior, while standard cutoff-based CHARMM36 lipid model with the 4-point OPC water model still provides the best agreement with experiments. Our results emphasize the importance of using high quality water models in applications and parameter development in molecular dynamics simulations of biomolecules.

Pseudolattice Theory of the Surface Tension of Ionic Liquid−Water Mixtures

2009 ◽  
Vol 113 (37) ◽  
pp. 12500-12505 ◽  
Author(s):  
L. M. Varela ◽  
J. Carrete ◽  
M. Turmine ◽  
E. Rilo ◽  
O. Cabeza
Keyword(s):  
Surface Tension ◽  
Ionic Liquid ◽  
Liquid Water

Comparison of Feeding Gas Strategies (Co- and Counter-Flow) in a PEM Fuel Cell Through a Pseudo 2D Diphasic Water Model

2008 ◽  
Author(s):  
Sylvain Chupin ◽  
Julien Ramousse ◽  
Kodjo Agbossou ◽  
Yves Dube´ ◽  
Sophie Didierjean ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Liquid Water ◽  
Water Distribution ◽  
Pem Fuel Cell ◽  
The Other ◽  
Water Model ◽  
Counter Flow ◽  
Cell Control ◽  
Water Flows ◽  
2D Model

The purpose of this study is to establish a simple model representing diphasic water flows in a single cell PEM fuel cell in order to improve fuel cell control. The pseudo-2D model describes the water transfers from one electrode to the other, all along the feeding gas channels. Both vapor and liquid water are considered. The location of first appearance of liquid water can be noticed. The influence of the feeding gas strategies (co- and counter-flow) on the water distribution in the cell are investigated. As a consequence, with the counter-flow feeding gas strategy, water is better distributed in the whole cell, but flooding of the electrode may occur. With a co-flow feeding gas strategy flooding risks are lower, but water distribution in the cell is less homogeneous and could result in a early deterioration of the membrane by drying.

Drops climbing uphill on an oscillating substrate

2011 ◽  
Vol 674 ◽  
pp. 93-119 ◽  
Author(s):  
E. S. BENILOV ◽  
J. BILLINGHAM
Keyword(s):  
Surface Tension ◽  
Shallow Water ◽  
Water Model ◽  
Two Dimensional ◽  
Shallow Water Model ◽  
Inclined Plane ◽  
The Cross

Recent experiments by Brunet, Eggers & Deegan (Phys. Rev. Lett., vol. 99, 2007, p. 144501 and Eur. Phys. J., vol. 166, 2009, p. 11) have demonstrated that drops of liquid placed on an inclined plane oscillating vertically are able to climb uphill. In the present paper, we show that a two-dimensional shallow-water model incorporating surface tension and inertia can reproduce qualitatively the main features of these experiments. We find that the motion of the drop is controlled by the interaction of a ‘swaying’ (odd) mode driven by the in-plane acceleration and a ‘spreading’ (even) mode driven by the cross-plane acceleration. Both modes need to be present to make the drop climb uphill, and the effect is strongest when they are in phase with each other.

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