title: On the anisotropy of gas transfer processes in nano- and microchannels
metadata.name: dc.contributor.author
metadata.value: Rudyak, Valery Ya.
metadata.lang: -
metadata.name: dc.contributor.author
metadata.value: Lezhnev, Evgeny V.
metadata.lang: -
metadata.name: dc.contributor.author
metadata.value: Lubimov, Daniil N.
metadata.lang: -
metadata.name: dc.date.accessioned
metadata.value: 2022-04-14T12:19:31Z
metadata.lang: -
metadata.name: dc.date.available
metadata.value: 2022-04-14T12:19:31Z
metadata.lang: -
metadata.name: dc.date.issued
metadata.value: 2022-03
metadata.lang: -
metadata.name: dc.identifier.citation
metadata.value: Rudyak V.Ya., Lezhnev E.V., Lubimov D.N. On the anisotropy of gas transfer processes in nano- and microchannels. Vestnik of Saint Petersburg University. Mathematics. Mechanics. Astronomy, 2022, vol. 9 (67), issue 1, pp. 152–163.
metadata.lang: en_GB
metadata.name: dc.identifier.other
metadata.value: https://doi.org/10.21638/spbu01.2022.115
metadata.lang: -
metadata.name: dc.identifier.uri
metadata.value: http://hdl.handle.net/11701/36163
metadata.lang: -
metadata.name: dc.description.abstract
metadata.value: The method of stochastic molecular modeling, developed by the authors for calculating the transport coefficients of rarefied gas in a free medium, is generalized to describe transport processes in confined conditions. The phase trajectories of the studied molecular system are simulated stochastically, and the simulation of the dynamics of the molecule is split into processes. First, its shift in the configuration space is realized, and then a possible collision with other molecules is played out. The calculation of all observables, in particular, the transport coefficients is carried out by averaging over an ensemble of independent phase trajectories. The interaction of gas molecules with the boundary is described by mirror or mirror-diffuse laws. The efficiency of the algorithm is demonstrated by calculating the selfdiffusion coefficient of argon in the nanochannel. The accuracy of modeling is investigated, its dependence on the number of particles and phase trajectories used for averaging. The viscosity of rarefied gases in the nanochannel has been systematically studied. It is shown that it is non-isotropic, and its difference along and across the channel is determined by the interaction of gas molecules with the channel walls. By changing the material of the walls, it is possible to significantly change the viscosity of the gas, and it can be several times greater than in volume, or less. The indicated anisotropy of viscosity is recorded not only in nano-, but also in microchannels.
metadata.lang: en_GB
metadata.name: dc.description.sponsorship
metadata.value: The work was partially supported by the Russian Foundation for Basic Research (grants no. 19-01-
  00399 and no. 20-01-00041) and the megagrant of the Ministry of Science and Higher Education of the
  Russian Federation (agreement no. 075-15-2021-575).
metadata.lang: en_GB
metadata.name: dc.language.iso
metadata.value: ru
metadata.lang: en_GB
metadata.name: dc.publisher
metadata.value: St Petersburg State University
metadata.lang: en_GB
metadata.name: dc.relation.ispartofseries
metadata.value: Vestnik of St Petersburg University. Mathematics. Mechanics. Astronomy;Volume 9; Issue 1
metadata.lang: -
metadata.name: dc.subject
metadata.value: viscosity
metadata.lang: en_GB
metadata.name: dc.subject
metadata.value: diffusion
metadata.lang: en_GB
metadata.name: dc.subject
metadata.value: molecular modeling
metadata.lang: en_GB
metadata.name: dc.subject
metadata.value: nanochannel
metadata.lang: en_GB
metadata.name: dc.subject
metadata.value: rarefied gas
metadata.lang: en_GB
metadata.name: dc.subject
metadata.value: transfer processes
metadata.lang: en_GB
metadata.name: dc.title
metadata.value: On the anisotropy of gas transfer processes in nano- and microchannels
metadata.lang: en_GB
metadata.name: dc.type
metadata.value: Article
metadata.lang: en_GB
resources.filename: 152-163.pdf
resources.url: https://dspace.spbu.ru/bitstream/11701/36163/1/152-163.pdf
resources.format: Adobe PDF
resources.size: 505,08 kB