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Leidenfrost gas ratchets driven by thermal creep

Abstract : We show that thermal creep is at the origin of the recently discovered Leidenfrost ratchet, where liquid droplets float on a vapor layer along a heated saw-tooth surface and accelerate to velocities of up to 40 cm/s. As the active element, the asymmetric temperature profile at each ratchet summit rectifies the vapor flow in the boundary layer. This mechanism works at low Reynolds number and provides a novel tool for controlling gas flow at nanostructured surfaces.
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https://hal.archives-ouvertes.fr/hal-00632232
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Submitted on : Thursday, November 17, 2011 - 11:48:00 AM
Last modification on : Tuesday, December 21, 2021 - 3:34:04 PM
Long-term archiving on: : Saturday, February 18, 2012 - 2:32:13 AM

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Alois Würger. Leidenfrost gas ratchets driven by thermal creep. Physical Review Letters, American Physical Society, 2011, 107, pp.164502 (4). ⟨10.1103/PhysRevLett.107.164502⟩. ⟨hal-00632232v2⟩

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