ISSN Online: 2377-424X
ISBN Print: 978-1-56700-474-8
ISBN Online: 978-1-56700-473-1
International Heat Transfer Conference 16
ULTRA-FAST VAPOR GENERATION BY A GRAPHENE NANO-RATCHET: A THEORETICAL AND SIMULATION STUDY
Resumo
Vapor generation is of prime importance for a broad range of applications: domestic water heating, desalination and wastewater treatment, etc. However, the slow and inefficient evaporation limits their development. In this paper, we proposed a nano-ratchet, multilayer graphene with cone-shaped nanopores (MGCN), to accelerate the vapor generation. By performing molecular dynamics simulation, we found that the air molecules were spontaneously transported across MGCN and formed a remarkable pressure difference, 21 kPa, between the two
sides of MGCN. Besides, we studied the dependence of pressure difference on the ambient temperature and the geometry of MGCN in detail. By the further analysis of the diffusive transport, we identified that the pressure difference depended on the competition between ratchet transport and Knudsen diffusion. It shows that the ratchet transport is dominant. The significant pressure difference could lead to 15 times enhancement of vapor
generation at least, which shows the wide applications of this nano-ratchet.