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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-474-8

ISBN Online: 978-1-56700-473-1

International Heat Transfer Conference 16
August, 10-15, 2018, Beijing, China

NUMERICAL SIMULATION OF MISCIBLE DISPLACEMENT IN MICROCHANNEL IN SLIP REGIME BY LATTICE BOLTZMANN METHOD

Get access (open in a dialog) DOI: 10.1615/IHTC16.nmt.023890
pages 7297-7306

要約

As for fluid flow in microchannel, the inertial force becomes less important, while the surface tension and viscous force are the dominant forces. In present paper, gas miscible displacement in slip regime is investigated by the lattice Boltzmann method (LBM). Firstly, Knudsen number is introduced to the LBM model by using the kinetic theory and the definition of viscous coefficient. For the boundary condition treatment, a boundary scheme, which combines the no-slip bounce-back and the free-slip specular reflection, is adopted in present model. On the basis of this, the slip velocity, flow field and concentration field of the displacement processes of air by xenon and helium, are analyzed in smooth and rough microchannels, respectively. The results are shown as follows: In a smooth microchannel, the time of xenon displacing air is less than that by helium. The slip velocity at the boundary related to the process of helium displacing air is greater than that of xenon displacing air. Under the same conditions, regardless of whether the displacement fluid is helium or xenon, the presence of roughness elements in microchannel leads to an increase in resistance during the displacement process, so that the displacement time in the rough microchannel is longer than that in the smooth microchannel.