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Self-propelling uneven Leidenfrost solids
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10.1063/1.4807007
/content/aip/journal/pof2/25/5/10.1063/1.4807007
http://aip.metastore.ingenta.com/content/aip/journal/pof2/25/5/10.1063/1.4807007

Figures

Image of FIG. 1.
FIG. 1.

A platelet of dry ice self-propels on a hot ratchet (450 °C). The white arrow shows the direction of propulsion. The bar indicates 3 mm (enhanced online). [URL: http://dx.doi.org/10.1063/1.4807007.1]doi: 10.1063/1.4807007.1.

Image of FIG. 2.
FIG. 2.

A centimeter-size platelet of dry ice on a hot flat surface (320 °C) with a small weight ( = 0.54 g) on the right side. The added mass tilts the platelet (by an angle θ = 0.3°), so that the ice gets propelled (enhanced online).. Two pictures are separated by 0.3 s and the scale represents 1 cm. The asymmetry can also be made by sculpting the dry ice (enhanced online). [URL: http://dx.doi.org/10.1063/1.4807007.2] [URL: http://dx.doi.org/10.1063/1.4807007.3]doi: 10.1063/1.4807007.2.

doi: 10.1063/1.4807007.3.

Image of FIG. 3.
FIG. 3.

(a) Sketch of the experiment: a platelet of dry ice of mass with an extra weight of mass on a side hovers above a flat surface. (b) Viscous force and pressure force applied by the vapor flow on the platelet.

Image of FIG. 4.
FIG. 4.

Velocity as a function of time for a given platelet (of mass = 2.8 g) and different added weights (of respective masses = 0.21 g, 0.78 g, and 1.24 g). The stronger the added mass, the more accelerated the platelet (enhanced online). [URL: http://dx.doi.org/10.1063/1.4807007.4]doi: 10.1063/1.4807007.4.

Image of FIG. 5.
FIG. 5.

(a) Measured angle θ as a function of the added mass . The solid line represents Eq. (4) , its slope is given by rad/kg. Each point is an average on five measurements. (b) Measured driving force as a function of the added mass . The solid line corresponds to Eq. (5) . Each point is an average on ten measurements.

Image of FIG. 6.
FIG. 6.

Two platelets of dry ice linked by an off-centered steel rod rotate. Two successive pictures are separated by 200 ms and the bar shows 2 cm. The angular acceleration deduced form these pictures is 2.0 ± 0.1 rad/s (enhanced online). [URL: http://dx.doi.org/10.1063/1.4807007.5]doi: 10.1063/1.4807007.5.

Image of FIG. 7.
FIG. 7.

A square platelet of camphor (6.0 g) with a small mass of 1.8 g on a hot plate (400 °C). Although the solid is now surrounded by liquid camphor, the whole object still self-propels. Two pictures are separated by 0.65 s and the scale represents 1 cm (enhanced online). [URL: http://dx.doi.org/10.1063/1.4807007.6]doi: 10.1063/1.4807007.6.

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/content/aip/journal/pof2/25/5/10.1063/1.4807007
2013-05-23
2014-04-24
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Self-propelling uneven Leidenfrost solids
http://aip.metastore.ingenta.com/content/aip/journal/pof2/25/5/10.1063/1.4807007
10.1063/1.4807007
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