Related Experiment Video
Updated: Jul 13, 2026
08:05
Microtensiometer for Confocal Microscopy Visualization of Dynamic Interfaces
Published on: September 9, 2022
Surface tension of the Widom-Rowlinson model
E de Miguel1, N G Almarza, G Jackson
1Departamento de Física Aplicada, Facultad de Ciencias Experimentales, Universidad de Huelva, 21071 Huelva, Spain. demiguel@uhu.es
The Journal of Chemical Physics
|July 28, 2007
Summary
This study computes surface tension for the Widom-Rowlinson binary mixture using direct simulations. Both canonical and fixed-normal-pressure ensembles yield consistent interfacial tension values, addressing system-size dependence.
Area of Science:
- Thermodynamics and Statistical Mechanics
- Computational Physics
- Materials Science
Background:
- The Widom-Rowlinson (WR) model is a theoretical framework for studying fluid-fluid interfaces.
- Accurate computation of surface tension is crucial for understanding phase behavior and interfacial phenomena.
- Direct simulation methods offer a powerful tool for investigating inhomogeneous systems.
Purpose of the Study:
- To compute the surface tension of the fluid-fluid interface for the Widom-Rowlinson binary mixture.
- To compare simulation results obtained from different ensembles (canonical and fixed-normal-pressure).
- To investigate the system-size dependence of the computed surface tension.
Main Methods:
- Direct simulation of the inhomogeneous Widom-Rowlinson binary mixture.
- Utilizing the mechanical route for surface tension calculation via pressure tensor components.
- Employing both canonical and fixed-normal-pressure ensembles for simulations.
- Performing simulations in the semigrand canonical ensemble to study fluid-fluid coexistence properties.
Main Results:
- Consistent surface tension values were obtained from both canonical and fixed-normal-pressure ensemble simulations.
- The study addresses and analyzes the system-size dependence of the surface tension.
- Fluid-fluid coexistence properties were simulated and compared with existing data for the WR mixture.
- Results were examined in relation to the vapor-liquid equilibrium of the equivalent one-component penetrable sphere model.
Conclusions:
- Direct simulations provide reliable methods for calculating surface tension in binary mixtures.
- The choice of ensemble does not significantly impact the computed interfacial tension values.
- The findings contribute to a better understanding of phase behavior in the Widom-Rowlinson model and its relation to other physical models.
More Related Videos
08:49Impacts of Free-falling Spheres on a Deep Liquid Pool with Altered Fluid and Impactor Surface Conditions
Published on: February 17, 2019
07:06Wicking Tests for Unidirectional Fabrics: Measurements of Capillary Parameters to Evaluate Capillary Pressure in Liquid Composite Molding Processes
Published on: January 27, 2017
Related Concept Videos
01:22Surface Tension of Fluid
Surface tension is a fundamental property of fluids, occurring at the boundary between a liquid and a gas or between two immiscible liquids. This phenomenon arises from the cohesive forces between molecules at the fluid's surface, creating an effect similar to a stretched elastic membrane. Inside each fluid, molecules are equally attracted in all directions by neighboring molecules, but surface molecules experience a net inward force, resulting in surface tension.
Surface tension varies with...
Surface tension varies with...
01:24Surface Tension
Surface tension is defined as the force per unit length (γ) acting along the surface of a liquid. It arises due to strong intermolecular forces of attraction. A molecule located inside the bulk of the liquid is surrounded by other molecules and experiences equal forces in all directions. However, a molecule at the surface experiences unbalanced forces because there are more neighboring molecules below than above. This creates a net inward force that pulls surface molecules toward the interior,...
01:16Surface Tension and Surface Energy
When a paint brush is immersed in water, the bristles wave freely inside the water. When it is taken out, the bristles stick together. The reason behind this effect is surface tension.
Consider a beaker filled with liquid. The bulk molecules in the liquid experience equal attractive forces on all sides with the surrounding molecules. However, the surface molecules experience a net attractive force downward due to the bulk molecules. The surface of the liquid behaves like a stretched membrane,...
Consider a beaker filled with liquid. The bulk molecules in the liquid experience equal attractive forces on all sides with the surrounding molecules. However, the surface molecules experience a net attractive force downward due to the bulk molecules. The surface of the liquid behaves like a stretched membrane,...
02:57Surface Tension, Capillary Action, and Viscosity
Surface Tension
The various IMFs between identical molecules of a substance are examples of cohesive forces. The molecules within a liquid are surrounded by other molecules and are attracted equally in all directions by the cohesive forces within the liquid. However, the molecules on the surface of a liquid are attracted only by about one-half as many molecules. Because of the unbalanced molecular attractions on the surface molecules, liquids contract to form a shape that minimizes the number...
The various IMFs between identical molecules of a substance are examples of cohesive forces. The molecules within a liquid are surrounded by other molecules and are attracted equally in all directions by the cohesive forces within the liquid. However, the molecules on the surface of a liquid are attracted only by about one-half as many molecules. Because of the unbalanced molecular attractions on the surface molecules, liquids contract to form a shape that minimizes the number...
01:21Design Example: Creating a Hydraulic Model of a Dam Spillway
Scaled hydraulic models of dam spillways provide a practical way to replicate and study the intricate flow dynamics of these structures. Often built to a 1:15 ratio, these models allow for observing critical water behavior, such as velocity distribution, flow patterns, and energy dissipation.
01:05Fluid Pressure over Flat Plate of Constant Width
When a body is submerged in water, it experiences fluid pressure acting normal on its surface and distributed over its area. For better design structures, it is crucial to determine the magnitude and location of the resultant force acting on the surface. In the case of a rectangular plate of constant width submerged in water, the pressure increases with depth, resulting in a linearly varying trapezoidal pressure distribution from the upper to the lower edge of the plate.
The resultant force...
The resultant force...