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Surface Tension of Fluid

Surface 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, Capillary Action, and Viscosity

Surface 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...

Rise of Liquid in a Capillary Tube

Rise of Liquid in a Capillary Tube

When very thin cylindrical tubes, called capillaries, are dipped in a liquid, the liquid rises or falls in the tube compared to the surrounding liquid. This phenomenon is called capillary action. Capillary action occurs due to the combination of two opposing forces: the cohesive forces of the liquid, which cause it to stick to itself and form a rounded shape, and the adhesive forces between the liquid and the walls of the container, which cause the liquid to be attracted to the container walls.

Capillarity in Fluid

Capillarity in Fluid

Capillarity describes the movement of liquid in small spaces without external forces acting on it. The capillarity is driven by surface tension and adhesive interactions between the liquid and surrounding solid surfaces. This effect is often seen in narrow tubes, porous materials, and fine particles.
Surface tension is crucial to capillarity. It results from cohesive forces between liquid molecules at the liquid-air boundary, forming a skin that resists external forces. When the capillary tube...

Boundary Layer Characteristics

Boundary Layer Characteristics

When a fluid encounters a solid surface, a boundary layer forms due to the interaction between the fluid's motion and the stationary surface. This phenomenon is characterized by a thin region adjacent to the surface where viscous forces dominate, influencing the fluid's velocity profile. The development of the boundary layer begins at the leading edge of the surface and evolves as the fluid moves downstream.As the fluid flows over the surface, friction between the fluid and the wall slows down...

Fluid Pressure over Flat Plate of Variable Width

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When a flat plate is submerged in a fluid, the fluid exerts pressure on the plate. This pressure can lead to many different phenomena, including drag and buoyancy. To understand the behavior of the fluid over a flat plate of variable width, it is essential to analyze the distribution of the pressure exerted.
The pressure distribution on the plate can be calculated by determining the force that acts on a differential area strip of the plate. Thus, the magnitude of the force is equal to the...

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Updated: May 10, 2026

Procedure for the Transfer of Polymer Films Onto Porous Substrates with Minimized Defects

Procedure for the Transfer of Polymer Films Onto Porous Substrates with Minimized Defects

Published on: June 22, 2019

Gravity-driven thin liquid films over topographical substrates.

A Mazloomi¹, A Moosavi, E Esmaili

¹Center of Excellence in Energy Conversion (CEEC), School of Mechanical Engineering, Sharif University of Technology, P.O. Box 11365-9567, Tehran, Iran.

The European Physical Journal. E, Soft Matter

|June 25, 2013

Summary

This summary is machine-generated.

Inclination angle enhances liquid film dynamics and ridge height but reduces coating depth. Critical groove width for coating decreases with smaller inclination angles, with specific values reported.

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Area of Science:

Fluid dynamics
Surface science
Computational physics

Background:

Thin liquid films are crucial in various industrial applications.
Understanding film behavior on inclined surfaces is key for optimizing coating processes.
Grooved substrates introduce complex interactions affecting film dynamics.

Purpose of the Study:

To investigate the influence of inclination angle on thin liquid film evolution.
To analyze the impact of substrate grooves on film coating and dynamics.
To determine critical groove dimensions for successful substrate coating.

Main Methods:

Utilized a multi-component lattice Boltzmann algorithm for simulations.
Simulated thin liquid films on inclined substrates with and without grooves.
Varied inclination angles and groove geometries to study their effects.

Main Results:

Increased inclination angle enhances film dynamics, ridge height, and displacement.
Higher inclination angles reduce the maximum coating depth achievable.
Critical groove width for successful coating decreases with smaller inclination angles.

Conclusions:

Inclination angle significantly alters thin liquid film behavior.
Groove geometry and inclination angle are critical parameters for coating optimization.
Derived critical groove sizes provide practical guidelines for substrate coating.