Momentum Transfer to Nanoobjects between Parallel Heated Plates

Details Momentum Transfer to Nanoobjects between Parallel Heated Plates Momentum Transfer to Nanoobjects between Parallel Heated Plates

2007-05-11

arxiv.org/abs/0705.1654v1

Physics

Fluid Dynamics

11 pages, figures included

Scientific paper

A small-scale, trapezoidal rigid body in the gas-filled gap between two parallel plates at different temperatures is considered. An analytical expression for the force onto the body in the direction parallel to the plates valid for an infinite Knudsen number is derived. Simultaneously, Monte-Carlo simulations are performed allowing to extend the analysis to Knudsen numbers of the order of one. The numerical and the analytical results show excellent agreement, indicating that a temperature gradient orthogonal to the plates can induce a significant force in parallel direction. This force is only slightly reduced when a Knudsen number of one is considered. In the future, the discovered effect may be exploited for the conversion of thermal into mechanical energy in nanomachines.

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