najoNanosystems: Physics, Chemistry, MathematicsНаносистемы: физика, химия, математика2220-80542305-7971Университет ИТМО10.17586/2220-8054-2023-14-2-186-194najo-130Research ArticlePHYSICSФИЗИКАModeling the rarefied gas thermal conductivity in nanochannelsМоделирование теплопроводности разреженного газа в наноканалахhttps://orcid.org/0000-0003-1335-4548РудякВ. Я.RudyakV. Ya.

Valery Ya. Rudyak

Lavrentiev Avenue, 1, 630090, Novosibirsk

Leningradskaya Street, 113, 630008

valery.rudyak@mail.ruhttps://orcid.org/0000-0003-3347-0781ЛежневЕ. В.LezhnevE. V.

 Evgeny V. Lezhnev

Leningradskaya Street, 113, 630008, Novosibirsk

lionlev@yandex.ruKutateladze Institute of Thermophysics of Siberian Branch of RAS; Novosibirsk State University of Architecture and Civil EngineeringRussian FederationNovosibirsk State University of Architecture and Civil EngineeringRussian Federation202303062025142186194Copyright © Rudyak V.Y., Lezhnev E.V., 20252025Рудяк В.Я., Лежнев Е.В.Rudyak V.Y., Lezhnev E.V.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://nanojournal.ifmo.ru/jour/article/view/130

In the paper, the thermal conductivity of rarefied gases in nanochannels and in bulk was studied. The following gases Ar, Kr, Ne, Xe, O2, CH4 were considered. The evolution of gas molecules in phase space was calculated by the method of the stochastic molecular modelling. It was established that the thermal conductivity coefficient of the gas in the nanochannel is anisotropic. Anisotropy of the thermal conductivity is caused by the interaction of gas molecules with the channel walls. This interaction is described by the specular or diffuse laws of molecules reflection. The thermal conductivity of gases across the channel is significantly lower than along it. The anisotropy of the thermal conductivity persists even in microchannels, but it decreases with the increasing of the gas density. In fact, the thermal conductivity coefficient is not a gas property only, but of a gas+channel wall system.

В работе исследована теплопроводность разреженных газов в наноканалах и в свободной среде. Рассматриваются следующие газы Ar, Kr, Ne, Xe, O2, CH4. Эволюция молекул газа в фазовом пространстве рассчитывается методом стохастического молекулярного моделирования. Установлено, что коэффициент теплопроводности газа в наноканале анизотропен. Анизотропия теплопроводности обусловлена взаимодействием молекул газа со стенками канала. Это взаимодействие описывается зеркальным или диффузным законами отражения молекул. Теплопроводность газов поперек канала значительно ниже, чем вдоль него. Анизотропия теплопроводности сохраняется даже в микроканалах, но уменьшается с увеличением плотности газа. На самом деле коэффициент теплопроводности является свойством не только газа, но и системы газ+стенка канала.

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The authors declare that there are no conflicts of interest present.