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Thermocapillary flow on superhydrophobic surfaces
Tobias Baier1, Clarissa Steffes, Steffen Hardt
1Center of Smart Interfaces, Technische Universität Darmstadt, Petersenstraße 32, 64287 Darmstadt, Germany. baier@csi.tu-darmstadt.de
Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|January 15, 2011
Summary
Superhydrophobic surfaces enable surface-driven transport. Thermal Marangoni flow over these surfaces generates significant velocities, suggesting potential for microfluidic pumping applications.
Area of Science:
- Fluid dynamics
- Surface science
- Nanotechnology
Background:
- Superhydrophobic surfaces facilitate surface-driven transport by maintaining a liquid in the Cassie-Baxter state.
- This state offers a large liquid-solid contact area, ideal for manipulating fluid behavior.
Purpose of the Study:
- To investigate thermal Marangoni flow over superhydrophobic surfaces with fin arrays.
- To analyze the induced bulk flow velocity under applied temperature gradients.
Main Methods:
- Derivation of an analytical expression for bulk flow velocity in the Stokes limit.
- Numerical solutions of the Navier-Stokes equation for comparison.
Main Results:
- Thermal Marangoni flow is induced over superhydrophobic fin arrays.
- Significant flow velocities are achieved even with moderate temperature gradients.
Conclusions:
- The study demonstrates the potential of thermal Marangoni flow on superhydrophobic surfaces for microfluidic applications.
- This principle can be utilized for developing novel microfluidic pumping systems.
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