Abstract
Gas flows in micro-channels are simulated using an open source Direct Simulation Monte Carlo (DSMC) code dsmcFOAM for general application to rarefied gas flow written within the framework of the open source C++ toolbox called OpenFOAM. Aim of this paper is to investigate the flow in micro-channel with bend with added curvature. Results are compared with flows in channel without added curvature and equivalent straight channel. Effects of micro-channel bend was already thoroughly investigated by White et al. Geometry proposed by White is also used here for refference.
Highlights
Considerable progress in field of miniaturization over recent years, most notably the advancements in development of MEMS have led to the need of investigation of gaseous flow in micro-scale geometries.Gas flow can be modeled either at macroscopic level (Navier-Stokes equations) or at microscopic level
Maximum decrease is found for sharp bend
The investigation of pressure driven flows in microchannels with bends with added curvature was performed for the case of flow in fully transition regime and for the case of flow in slip to transition regime
Summary
Gas flow can be modeled either at macroscopic level (Navier-Stokes equations) or at microscopic level. The Direct Simulation Monte Carlo method, as described by Bird [1], is the dominant numerical method for solving engineering problem involving rarefied gas flow. Degree of rarefaction of a gas is classified throughout the dimensionless Knudsen number ݊ܭൌ ఒ, (1) . Where Ȝ is mean free path of the gas molecules and L is the characteristic dimension of the flow. As can be seen from equation (1), high degree of rarefaction can be achieved by either lowering the density of the gas or decreasing characteristic dimension of the fluid region. Flows with Knudsen number around 0.05 are considered
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