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January 25, 2026Physics of Fluids

Self-propelling Leidenfrost ratchet boats

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Authors

IVIvan U. VakarelskiFKFarrukh KamoliddinovTTTadd Truscott

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Overview

Experimental analysis of self-propulsion in ratchet boats indicates improved efficiency with specific designs.

Key Points

  • This research aims to explore the dynamics of self-propulsion in boats utilizing asymmetric ratchet configurations on heated surfaces.
  • Constructed macroscopic alumina boats with asymmetric ratchets floating in volatile perfluorocarbon liquid.
  • Heated boats to 280 °C and measured self-propulsion speeds and distances traveled.
  • Analyzed impact of ratchet geometry on propulsion efficiency and drag during towing tests.
  • Boats reached speeds of several centimeters per second, traveling over one meter.
  • Efficiency differed based on ratchet geometry, with small pitches enhancing propulsion.
  • Herringbone-patterned ratchets provided further gains, and drag was reduced by ∼10% with proper orientation.

Cite This Study

Vakarelski et al. (2026) studied this question.

synapsesocial.com/papers/6975b229feba4585c2d6da6chttps://doi.org/10.1063/5.0304551
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