Hardt Steffen, Tiwari Sudarshan, Baier Tobias
Center of Smart Interfaces, TU Darmstadt, Petersenstrasse 17, D-64287 Darmstadt, Germany.
Phys Rev E Stat Nonlin Soft Matter Phys. 2013 Jun;87(6):063015. doi: 10.1103/PhysRevE.87.063015. Epub 2013 Jun 24.
The significance of thermally driven flows for the propulsion of Leidenfrost solids on a ratchet surface is studied based on a numerical solution of the Boltzmann equation. The resulting flow patterns are dominated by vortices developing at the edges of the ratchet teeth. In a previous analysis it had been claimed that thermally driven flows could cause the propulsion of Leidenfrost objects. In contrast to that analysis, it is found that such flows make an insignificant contribution to the thrust of Leidenfrost solids on ratchet surfaces, which is dominated by the pressure-driven flow due to the sublimating solid.
基于玻尔兹曼方程的数值解，研究了热驱动流对莱顿弗罗斯特固体在棘轮表面推进的意义。产生的流动模式主要由在棘轮齿边缘形成的涡旋主导。在先前的分析中，有人声称热驱动流可导致莱顿弗罗斯特物体的推进。与该分析相反，研究发现这种流动对莱顿弗罗斯特固体在棘轮表面的推力贡献微不足道，其推力主要由升华固体引起的压力驱动流主导。
