Volume 79, Number 2, July 2007
|Number of page(s)||6|
|Section||Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics|
|Published online||20 June 2007|
Slip-driven thermal rectification
Faculty of Mechanical Engineering, Technion-Israel Institute of Technology - Haifa 32000, Israel
Accepted: 31 May 2007
When animated by appreciable temperature gradients, the tendency of gases to slip over non-isothermal solid surfaces is governed by inherently nonlinear equations. Using a simple two-dimensional channel configuration, wherein gas motion is driven by an externally imposed spatially periodic temperature input, it is demonstrated that this nonlinearity results in thermal rectification: periodic temperature inputs that break left-right symmetry can generate a net mass flux along the channel. This flux is not predicted by the commonly employed small-temperature-difference linearized model.
PACS: 47.10.ad – Navier-Stokes equations / 47.45.Gx – Slip flows and accommodation / 47.57.jd – Electrokinetic effects
© Europhysics Letters Association, 2007
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