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High-frequency nanofluidics: an experimental study using nanomechanical resonators.

D M Karabacak¹, V Yakhot, K L Ekinci

¹Department of Aerospace and Mechanical Engineering, Boston University, Boston, Massachusetts 02215, USA.

Physical Review Letters

|August 7, 2007

Summary

This study uses nanomechanical resonators to investigate fluid dynamics, revealing a transition from Newtonian to non-Newtonian flow. Experimental data align with theories predicting elastic fluid behavior at high frequencies.

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Area of Science:

Fluid Dynamics
Nanomechanics
Rheology

Background:

Understanding fluid behavior under various conditions is crucial.
Oscillatory fluid dynamics present unique challenges for characterization.
Nanomechanical resonators offer a novel approach to probe fluid properties.

Purpose of the Study:

To investigate oscillatory fluid dynamics using nanomechanical resonators.
To explore the transition from Newtonian to non-Newtonian fluid behavior.
To compare experimental findings with theoretical predictions.

Main Methods:

Utilizing a high-resonance-frequency nanomechanical resonator to generate oscillating flow.
Studying the flow-resonator interaction to analyze fluid dynamics.
Conducting experiments over a broad frequency and pressure range.

Main Results:

Observed signs of a transition from Newtonian to non-Newtonian flow at omega tau approximately 1.
Experimental data showed quantitative agreement with theoretical predictions.
Demonstrated the capability of nanomechanical resonators in studying fluid properties.

Conclusions:

Nanomechanical resonators are effective tools for studying oscillatory fluid dynamics.
A transition to non-Newtonian behavior is identified under specific conditions.
The study supports theories of elastic fluid response at high frequencies.