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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">phmath</journal-id><journal-title-group><journal-title xml:lang="ru">Вестник Государственного университета просвещения. Серия: Физика-Математика</journal-title><trans-title-group xml:lang="en"><trans-title>Bulletin of Federal State University of Education. Series: Physics and Mathematics</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2949-5083</issn><issn pub-type="epub">2949-5067</issn><publisher><publisher-name>Federal State University of Education</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.18384/2949-5067-2026-1-16-24</article-id><article-id custom-type="elpub" pub-id-type="custom">phmath-756</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>ФИЗИКА</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>PHYSICS</subject></subj-group></article-categories><title-group><article-title>Решение уравнения Клаузинга для течения разреженного газа в круглой трубе</article-title><trans-title-group xml:lang="en"><trans-title>Solution of the Clausing equation for the flow of a rarefied gas in a circular pipe</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Горелов</surname><given-names>С. Л.</given-names></name><name name-style="western" xml:lang="en"><surname>Gorelov</surname><given-names>S. L.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Горелов Сергей Львович – доктор физико-математических наук, доцент,ведущий научный сотрудник</p><p>г. Жуковский, Московская область</p></bio><bio xml:lang="en"><p>Sergey L. Gorelov (Moscow) – Dr. Sci. (Phys.-Math.), Assoc. Prof., Leading Researcher</p><p>Zhukovsky, Moscow Region</p></bio><email xlink:type="simple">gorelovsl@yandex.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Федеральное автономное учреждение «Центральный аэрогидродинамический институт имени профессора Н. Е. Жуковского»</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Central Aerohydrodynamic Institute</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2026</year></pub-date><pub-date pub-type="epub"><day>24</day><month>07</month><year>2026</year></pub-date><volume>0</volume><issue>1</issue><fpage>16</fpage><lpage>24</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Горелов С.Л., 2026</copyright-statement><copyright-year>2026</copyright-year><copyright-holder xml:lang="ru">Горелов С.Л.</copyright-holder><copyright-holder xml:lang="en">Gorelov S.L.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://www.physmathmgou.ru/jour/article/view/756">https://www.physmathmgou.ru/jour/article/view/756</self-uri><abstract><sec><title>Цель</title><p>Цель. Решение уравнения Клаузинга, описывающего течение разреженного газа в круглой трубе.</p></sec><sec><title>Процедура и методы</title><p>Процедура и методы. Предлагается приближенное аналитическое решение этого уравнения, основанное на методе самоподобной интерполяции.</p></sec><sec><title>Результаты</title><p>Результаты. Вероятности прохождения, полученные в работе, сравниваются с результатами известных численных решений.</p><p>Теоретическая и практическая значимость. Расчёт течения газа по каналам различной геометрии в вакуумных установках является одной из важнейших задач динамики разреженного газа.</p></sec></abstract><trans-abstract xml:lang="en"><sec><title>Aim</title><p>Aim. Solution of the Clausing equation describing rarefied gas flow in a circular pipe.</p></sec><sec><title>Methodology</title><p>Methodology. An approximate analytical solution of this equation is proposed, based on the method of self-similar interpolation.</p></sec><sec><title>Results</title><p>Results. The passage probabilities obtained in the study are compared with the results of known numerical solutions.</p></sec><sec><title>Research implications</title><p>Research implications. Calculating gas flow through channels of various geometries in vacuum systems is one of the most important problems in rarefied gas dynamics.</p></sec></trans-abstract><kwd-group xml:lang="ru"><kwd>динамика разреженного газа</kwd><kwd>уравнение Клаузинга</kwd><kwd>самоподобная интерполяция</kwd></kwd-group><kwd-group xml:lang="en"><kwd>rarefied gas dynamics</kwd><kwd>Clausing equation</kwd><kwd>self-similar interpolation</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Knudsen M. Die Gesetze der Molekularstromung und der inneren Reibungsstromung der Gase durch Rohrn // Annalen der Physik. 1909. Vol. 333. Iss. 1. P. 75–130. 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