격자 볼츠만 방법을 이용한 미소 채널에서의 가스 유동에 대한 표면 거칠기 영향

Abstract

Surface roughness is present in most of the microfluidic devices due to the microfabrication techniques. This paper presents lattice Boltzmann method (LBM) results for gas flow of low Reynolds number. surface roughness is modeled by a zigzag array of rectangular modules placed on two sides of a parallel-plate channel. In this study, passive scalar code in lattice Boltzmann Method is used to simulate temperature field for gas flow of low Reynolds number in a microchannel. The results show significant effects of temperature field and surface roughness in the term of the roughness element height. Finally, a significant increase in Poiseuille number is detected as the surface roughness is considered, while the effect of roughness on the temperature field is depends on the surface roughness height.