High heat capacity and constant operation temperature make a 2-phase heat remover tool promising for solving high heat dissipation problems in MEMS devices. However, microscale analysis of the flow with the conventional Navier-Stokes equation is inadequate, because the non-continuum effect is important when the characteristic dimension is comparable to the local mean free path. DSMC is a direct, particle-based numerical simulation method that uses no continuum assumption. In this paper, the gas-liquid boundary effects in microchannel flow are studied using this method. Modified DSMC code is used to simulate low-speed flow - under which viscous heating produces no significant temperature change - and MD results are incorporated into the DSMC boundary condition. Steady Couette flow simulation results show that the gas-liquid boundary affects the density distribution and the temperature dependence of the slip velocity. Unsteady simulation results show that mass transfer by diffusion is faster than momentum transfer by collision.
|Number of pages
|International Journal of Computational Fluid Dynamics
|Published - 2006 Oct
Bibliographical noteFunding Information:
This work was supported by Korea Research Foundation Grant (KRF-2002-041-D00069).
All Science Journal Classification (ASJC) codes
- Computational Mechanics
- Aerospace Engineering
- Condensed Matter Physics
- Energy Engineering and Power Technology
- Mechanics of Materials
- Mechanical Engineering