Authors: F. Sharipov
Affilation: Universidade Federal do Parana, Brazil
Pages: 566 - 569
Keywords: cross phenomena, rarefied gas, micro-channels, micropumps, microvalves
Since the size of micro fluidics is very small the gas owing through micropumps, microvalves etc. can not be considered as a continuous medium but its rarefacation must be taken into account. The rarefied gas properties are qualitatively different from those of a continuum fluid. The principal different is the existence of the so-called cross phenomena, which can be used to create new types of micro fluidics and to optimize the existing ones. For instance, the thermocreep is successfully used in micropumps without moving parts. The light induced drift of gas allows us to move a gas using a laser beam. Many cross phenomena appear in an anisotropic medium such as apolyatomic gas staying in a magnetic field. As a result, the gyrothermal effect arises between two coaxial cylinders confiding a polyatomic gas. The thermal magnetic effect can be also used to pump a polyatomic gas. In the present paper a review of the cross phenomena is given with their numerical estimations when possible.