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Magnetowetting of Ferrofluidic Thin Liquid Films
Srinivas Tenneti1, Sri Ganesh Subramanian1, Monojit Chakraborty1
1Department of Chemical Engineering, Indian Institute of Technology, Kharagpur 721302, India.
Scientific Reports
|March 18, 2017
Summary
A magnetic field drives ferrofluid films forward, changing their shape and curvature. This study measures these changes using interferometry and modeling to understand fluid dynamics.
Area of Science:
- Fluid dynamics
- Magnetohydrodynamics
- Surface science
Background:
- Ferrofluid films exhibit complex behavior under external forces.
- Understanding thin film dynamics is crucial for microfluidic applications.
Purpose of the Study:
- To investigate the motion and profile changes of a ferrofluid film under an axisymmetric magnetic field.
- To quantify the film's velocity, acceleration, and curvature.
- To model the interplay of magnetic and interfacial forces.
Main Methods:
- Utilized image analyzing interferometry for precise film thickness measurement.
- Analyzed video data in the Lagrangian frame to determine film dynamics.
- Developed a theoretical model incorporating magnetic and interfacial forces.
Main Results:
- Observed significant forward movement of the ferrofluid film.
- Measured non-uniform increases in local film curvature due to magnetic field application.
- Quantified instantaneous velocity and acceleration profiles.
Conclusions:
- The magnetic field induces unique deformations and motion in ferrofluid films.
- The developed model accurately captures the observed changes in film profile and dynamics.
- Findings provide insights into controlling ferrofluid behavior for potential applications.
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