http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
오늘 본 자료
Nanoscale Transport Phenomena: Scale Effect on Continuum Analysis
Jaber Al Hossain,BoHung Kim 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.6
The dimensions of digital devices are shrinking rapidly. Micro/nano device heat control is becoming a critical challenge for developing such devices. Additionally, the necessity of using nanoscale fluid transport knowledge in ion transportation, biosensors, lab-on-a-chip gadgets or fuel cells applications is rapidly increasing. An accurate understanding of the nanoscale transport mechanism is required to produce efficient nano-devices. MD simulations were per formed to investigate the nano-confinement effect on the continuum analysis. Solid solid interfacial system and pressure driven fluid flow through nanoporous graphene membrane were studied to understand the scale effect on nanoscale interfacial heat and fluid transport, respectively. For the solid-solid systems, it was observed that the density difference between two same materials with different crystal orientations fluctuates at the nanoscale, but this fluctuation diminishes at the continuum scale. Similarly, for the pressure-driven flow through nanoporous graphene membrane, the velocity profile inside a nanopore obtained by MD differs from the continuum Sampson’s solution. It is shown that the deviation becomes significant for the nanopore with sub-1nm of radius. Because at this range, the repulsive force inside the nanopore become dominant, which is not considered in the continuum analysis. Also, this deviation minimizes with increasing the pore size above 2nm as the repulsive forces inside the nanopore starting to be less effective. To mitigate this divergence, considering proper geometric boundary approximations and local nanoscale variants in continuum analysis at the nanoscale applications is essential.