Slip-driven thermal rectificationE. Yariv
Faculty of Mechanical Engineering, Technion-Israel Institute of Technology - Haifa 32000, Israel
received 9 January 2007; accepted in final form 31 May 2007; published July 2007
published online 20 June 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.
47.10.ad - Navier-Stokes equations.
47.45.Gx - Slip flows and accommodation.
47.57.jd - Electrokinetic effects.
© Europhysics Letters Association 2007