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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-474-8

ISBN Online: 978-1-56700-473-1

International Heat Transfer Conference 16
August, 10-15, 2018, Beijing, China

ULTRA-FAST VAPOR GENERATION BY A GRAPHENE NANO-RATCHET: A THEORETICAL AND SIMULATION STUDY

Get access (open in a dialog) DOI: 10.1615/IHTC16.mpe.022436
pages 6037-6044

Аннотация

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.