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Related Experiment Video

Updated: May 17, 2026

Fast Imaging Technique to Study Drop Impact Dynamics of Non-Newtonian Fluids

Fast Imaging Technique to Study Drop Impact Dynamics of Non-Newtonian Fluids

Published on: March 5, 2014

Dynamic spreading of nanofluids on solids part II: modeling.

Kuan-Liang Liu¹, Kirtiprakash Kondiparty, Alex D Nikolov

¹Department of Chemical and Biological Engineering, Illinois Institute of Technology, Chicago, Illinois 60616, USA.

Langmuir : the ACS Journal of Surfaces and Colloids

|October 20, 2012

Summary

Nanoparticle structuring in nanofluids drives spreading by creating a wedge film. Increasing nanoparticle concentration and decreasing size or interfacial tension accelerate this inner contact line movement.

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The Diffusion of Passive Tracers in Laminar Shear Flow

The Diffusion of Passive Tracers in Laminar Shear Flow

Published on: May 1, 2018

Area of Science:

Fluid dynamics
Nanotechnology
Surface science

Background:

Nanofluids exhibit self-layering and 2D structuring at the three-phase contact line.
This structuring generates disjoining pressure, enabling wedge film formation and driving nanofluid spreading.

Purpose of the Study:

Investigate the spreading dynamics of nanofluids on a solid surface against an oil drop.
Analyze the influence of various parameters on nanofluidic film formation and inner contact line velocity.

Main Methods:

Modeling the spreading process using Navier-Stokes equations via a lubrication approach.
Incorporating structural disjoining pressure, gravity, and van der Waals forces.
Analyzing temporal interface profiles and inner contact line velocity.

Main Results:

Increasing nanoparticle concentration and decreasing nanoparticle size or interfacial tension promotes faster inner contact line movement.
Nanofluidic film formation leads to a constant advancing inner contact line velocity.
This final velocity is independent of the outer contact angle when interfacial tension is constant.

Conclusions:

Structural disjoining pressure is a key mechanism for nanofluid spreading.
Controlling nanoparticle properties and interfacial tension allows for tunable spreading dynamics.
The study provides insights into the fundamental physics governing nanofluid behavior for practical applications.