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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...

Steady, Laminar Flow Between Parallel Plates

Steady, Laminar Flow Between Parallel Plates

Understanding steady, laminar flow between parallel plates is essential for analyzing and designing flow in narrow rectangular channels, commonly found in various water conveyance and drainage systems. The Navier-Stokes equations govern fluid motion and are generally challenging to solve due to their nonlinearity. However, simplifications are possible in certain cases, like the steady laminar flow between parallel plates. For this scenario, we assume steady, incompressible, laminar flow.

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...

Couette Flow

Couette Flow

Couette flow represents the flow of fluid between two parallel plates, with one plate fixed and the other moving with a constant velocity. This configuration allows for a simplified analysis using the Navier-Stokes equations, which govern fluid motion under conditions of viscosity and incompressibility. For Couette flow, the assumptions include a steady, laminar, incompressible flow with a zero-pressure gradient in the flow direction. This flow type is beneficial for understanding shear-driven...

Viscosity

Viscosity

When water is poured into a glass, it falls freely and quickly, whereas if honey or maple syrup is poured over a pancake, it flows slowly and sticks to the surface of the container. This difference in the flow of different kinds of liquids arises due to the fluid friction between the liquid layers and the liquid and the surrounding material. This property of fluids is called fluid viscosity. In this example, water has a lower viscosity than honey and maple syrup.
The SI unit of viscosity is...

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...

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Related Experiment Video

Updated: Aug 26, 2025

Orientational Transition in a Liquid Crystal Triggered by the Thermodynamic Growth of Interfacial Wetting Sheets

Orientational Transition in a Liquid Crystal Triggered by the Thermodynamic Growth of Interfacial Wetting Sheets

Published on: May 15, 2017

Liquid Heterostructures: Generation of Liquid-Liquid Interfaces in Free-Flowing Liquid Sheets.

David J Hoffman¹, Hans A Bechtel², Diego A Huyke³

¹Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California94025, United States.

Langmuir : the ACS Journal of Surfaces and Colloids

|October 11, 2022

Summary

Researchers developed liquid heterostructures, thin films of layered liquids, to study interfaces. This microfluidic method creates tunable, nanometer-thick buried liquid layers ideal for advanced spectroscopy.

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Last Updated: Aug 26, 2025

Orientational Transition in a Liquid Crystal Triggered by the Thermodynamic Growth of Interfacial Wetting Sheets

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Published on: May 15, 2017

The Preparation of Electrohydrodynamic Bridges from Polar Dielectric Liquids

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Published on: September 30, 2014

Nanoscale Characterization of Liquid-Solid Interfaces by Coupling Cryo-Focused Ion Beam Milling with Scanning Electron Microscopy and Spectroscopy

Nanoscale Characterization of Liquid-Solid Interfaces by Coupling Cryo-Focused Ion Beam Milling with Scanning Electron Microscopy and Spectroscopy

Published on: July 14, 2022

Area of Science:

Physical Chemistry
Materials Science
Fluid Dynamics

Background:

Liquid-liquid interfaces are crucial for chemical and biological processes.
Studying these interfaces is challenging due to the dominance of bulk liquid phases.

Purpose of the Study:

To develop a novel method for creating and studying thin liquid-liquid interfaces.
To generate multilayer liquid films with tunable thickness and well-defined interfaces.

Main Methods:

Utilizing a microfluidic nozzle to precisely control converging liquid jets.
Forming multilayer liquid sheets with a central layer enveloped by two outer layers.
Employing infrared microscopy, white light reflectivity, and imaging ellipsometry for characterization.

Main Results:

Successfully generated free-flowing liquid heterostructures with tunable buried layer thickness.
Demonstrated that the inner liquid layer can be as thin as tens of nanometers.
Confirmed the presence of well-defined liquid-liquid interfaces within the heterostructures.

Conclusions:

Liquid heterostructures offer a unique platform for interfacial studies.
This method significantly reduces bulk liquid, enhancing the study of buried interfaces.
The technique is ideal for spectroscopic and scattering experiments requiring minimal bulk interference.