Leidenfrost ratchets are structures with the ability of transporting liquid droplets when heated over the critical Leidenfrost temperature. Once this temperature is reached, the droplet levitates over the surface and moves in the direction marked by the slope of the ratchet at terminal velocities around 10 cm/s. Here we provide new experiments with micron-sized ratchets, which have been produced with picosecond pulse laser ablation. In the following work, we use a simple method to measure the thrust driving droplets of capillary size over the micro-ratchets. The mechanism responsible for the force acting on the drop on superheated ratchets has been recently under debate. We extend the recently proposed “viscous mechanism” proposed by Dupeux et al. [Europhys. Lett. 96, 58001 (2011) https://doi.org/10.1209/0295-5075/96/58001] to capillary droplets and find good agreement with our measurements.
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December 2012
Research Article|
December 06 2012
Capillary droplets on Leidenfrost micro-ratchets
Álvaro G. Marín;
Álvaro G. Marín
a)
1Physics of Fluids, Mesa+, Faculty of Science and Technology,
University of Twente
, The Netherlands
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Daniel Arnaldo del Cerro;
Daniel Arnaldo del Cerro
2Applied Laser Technology, Faculty of Engineering Technology,
University of Twente
, The Netherlands
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Gertwillem R. B. E. Römer;
Gertwillem R. B. E. Römer
2Applied Laser Technology, Faculty of Engineering Technology,
University of Twente
, The Netherlands
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B. Pathiraj;
B. Pathiraj
2Applied Laser Technology, Faculty of Engineering Technology,
University of Twente
, The Netherlands
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Albertus Huis in 't Veld;
Albertus Huis in 't Veld
2Applied Laser Technology, Faculty of Engineering Technology,
University of Twente
, The Netherlands
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Detlef Lohse
Detlef Lohse
b)
1Physics of Fluids, Mesa+, Faculty of Science and Technology,
University of Twente
, The Netherlands
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a)
Present address: Institute of Fluid Mechanics and Aerodynamics, Bundeswehr University, Munich, Germany. Electronic mail: [email protected].
b)
Electronic mail: [email protected].
Physics of Fluids 24, 122001 (2012)
Article history
Received:
June 24 2012
Accepted:
October 05 2012
Citation
Álvaro G. Marín, Daniel Arnaldo del Cerro, Gertwillem R. B. E. Römer, B. Pathiraj, Albertus Huis in 't Veld, Detlef Lohse; Capillary droplets on Leidenfrost micro-ratchets. Physics of Fluids 1 December 2012; 24 (12): 122001. https://doi.org/10.1063/1.4768813
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