Title: Analysis of velocity slip flow in lubrication film of aerostatic guide way in micron scale

Authors: Fangwei Ning; Wei Long; Shaohua Yang; Hao Pei

Addresses: Faculty of Mechanical and Electrical Engineering, Kunming University of Science and Technology, Kunming 650500, China ' Faculty of Mechanical and Electrical Engineering, Kunming University of Science and Technology, Kunming 650500, China ' Faculty of Mechanical and Electrical Engineering, Kunming University of Science and Technology, Kunming 650500, China ' Faculty of Mechanical and Electrical Engineering, Kunming University of Science and Technology, Kunming 650500, China

Abstract: When lubricating gas film of aerostatic guide way worked in the level of micron, rarefaction effect plays an important role in internal airflow. Based on simulation of large-scale molecular massively parallel simulator (LAMMPS), Lattice Boltzmann method (LBM) and computational fluid dynamics (CFD) in this paper, velocity slip and pressure distribution in gas film are discussed. In the method of calculation and simulation, the gas film lubrication along flowing direction can be classified into two areas: pressure driven area and Newton friction area. But, at the same time, along its height direction, it is also divided into near wall layer, rarefied layer and continuous flow layer. Velocity slip mainly appears in both the near wall layer and the rarefied layer of pressure driven area. Meanwhile, velocity slip present in pressure driven area and Newton friction areas. Gas stratification and velocity slip maybe enhanced with increasing gas flow rate, whereas gas stratification in Newton friction zone is gradually weakening. Therefore, slippage speed gradually degenerates into the level of near-wall boundary layer. [Received 28 July 2016; Accepted 16 November 2016]

Keywords: rarefied effect; velocity slip; gas stratification; aerostatic guide way; micron scale.

DOI: 10.1504/IJMR.2017.085416

International Journal of Manufacturing Research, 2017 Vol.12 No.2, pp.240 - 252

Received: 28 Jul 2016
Accepted: 16 Nov 2016
Published online: 25 Jul 2017 *

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