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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">vestifm</journal-id><journal-title-group><journal-title xml:lang="ru">Известия Национальной академии наук Беларуси. Серия физико-математических наук</journal-title><trans-title-group xml:lang="en"><trans-title>Proceedings of the National Academy of Sciences of Belarus. Physics and Mathematics Series</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1561-2430</issn><issn pub-type="epub">2524-2415</issn><publisher><publisher-name>The Republican Unitary Enterprise Publishing House "Belaruskaya Navuka"</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.29235/1561-2430-2021-57-2-242-254</article-id><article-id custom-type="elpub" pub-id-type="custom">vestifm-591</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>Конвективная неустойчивость воздушных потоков в вытяжной шахте над четырехрядным оребренным пучком</article-title><trans-title-group xml:lang="en"><trans-title>Convective instability of air flows in the exhaust shaft above a four-row finned beam</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>Карлович</surname><given-names>Т. Б.</given-names></name><name name-style="western" xml:lang="en"><surname>Karlovich</surname><given-names>T. B.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Карлович Татьяна Борисовна − к андидат физико-математических наук, доцент кафедры энергосбережения, гидравлики и теплотехники</p><p>ул. Свердлова, 13а, 220006, г. Минск, Республика Беларусь</p></bio><bio xml:lang="en"><p>Tatyana B. Karlovich − Ph. D. (Physics and Mathematics), Associate Professor of the Department of Energy-Saving, Hydraulics and Heat Engineering</p><p>13a, Sverdlov Str., 220006, Minsk, Republic of Belarus</p></bio><email xlink:type="simple">tbkar@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Сухоцкий</surname><given-names>А. Б.</given-names></name><name name-style="western" xml:lang="en"><surname>Sukhotskii</surname><given-names>A. B.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Сухоцкий Альберт Борисович − кандидат технических наук, доцент кафедры энергосбережения, гидравлики и теплотехники</p><p>ул. Свердлова, 13а, 220006, г. Минск, Республика Беларусь</p></bio><bio xml:lang="en"><p>Albert B. Sukhotskii − Ph. D. (Engineering), Associate Professor of the Department of Energy-Saving, Hydraulics and Heat Engineering</p><p>13a, Sverdlov Str., 220006, Minsk, Republic of Belarus</p></bio><email xlink:type="simple">alk2905@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Данильчик</surname><given-names>Е. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Danilchik</surname><given-names>E. S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Данильчик Екатерина Сергеевна – аспирант</p><p>ул. Свердлова, 13а, 220006, г. Минск, Республика Беларусь</p></bio><bio xml:lang="en"><p>Ekaterina S. Danilchik – Postgraduate Student</p><p>13a, Sverdlov Str., 220006, Minsk, Republic of Belarus</p></bio><email xlink:type="simple">katya.156.156@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Белорусский государственный технологический университет</institution></aff><aff xml:lang="en"><institution>Belarusian State Technological University</institution></aff></aff-alternatives><pub-date pub-type="collection"><year>2021</year></pub-date><pub-date pub-type="epub"><day>15</day><month>07</month><year>2021</year></pub-date><volume>57</volume><issue>2</issue><fpage>242</fpage><lpage>254</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Карлович Т.Б., Сухоцкий А.Б., Данильчик Е.С., 2021</copyright-statement><copyright-year>2021</copyright-year><copyright-holder xml:lang="ru">Карлович Т.Б., Сухоцкий А.Б., Данильчик Е.С.</copyright-holder><copyright-holder xml:lang="en">Karlovich T.B., Sukhotskii A.B., Danilchik E.S.</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://vestifm.belnauka.by/jour/article/view/591">https://vestifm.belnauka.by/jour/article/view/591</self-uri><abstract><p>Рассмотрены разнонаправленные квазипериодические воздушные течения в вытяжной шахте над четырехрядным горизонтальным пучком, состоящим из биметаллических ребристых труб, которые служат для от- вода теплоты в теплообменных аппаратах. Проведено моделирование движения воздуха на основе уравнений для термогравитационной конвекции, включающей тепловую и гидродинамическую задачи для свободно-конвективного течения вязкой жидкости в приближении Буссинеска. Предложена интерпретация квазипериодических воздушных течений в шахте на основе конвекции Рэлея – Бенара, в результате которой в жидкости или газе формируются правильные структуры, называемые ячейками Рэлея – Бенара. Ячейки Рэлея – Бенара появляются при переходе из устойчивого состояния системы в неустойчивое в результате действия возмущений скорости и температуры. Рассмотрены возможные двумерные (конвективные валы) и трехмерные (прямоугольные ячейки) структуры, формирующиеся в шахте для различных подведенных электрических мощностей к пучку оребренных труб. Для оценки числа возникающих структур рассчитаны критические числа Рэлея, характеризующие критические градиенты температур и критические движения в системе. Для двух экспериментов проведено сравнение экспериментальных чисел Рэлея с их критическими значениями. Также обсуждаются отличия условий проведения эксперимента от используемых в расчетах идеальных граничных условий и частичном разрушении квазипериодических структур вследствие этого.</p></abstract><trans-abstract xml:lang="en"><p>Herein, multidirectional quasiperiodic air flows in an exhaust shaft above a four-order horizontal bundle consisting of bimetallic finned tubes used to remove heat in heat exchangers are considered. Modeling of the air movement is carried out on the basis of equations for thermogravitational convection in the Boussinesq approximation. It takes into account the viscosity of the air and the dependence of the air density on the temperature. An interpretation of quasiperiodic airstreams is proposed on the basis of Rayleigh – Bénard convection, as a result of which regular structures, called Rayleigh – Bénard cells, are formed in a liquid or gas. Rayleigh – Bénard cells are an analytical solution to the problem of the stability of hydrodynamics flows in the linear approximation. The appearance of two-dimensional (convective rolls) and threedimensional (rectangular cells) is possible. To estimate the number of emerging structures, the critical Rayleigh numbers were calculated, which characterizes the transition from an unstable mode of the convective fluid flow to a stable mode. For two experiments, the experimental Rayleigh numbers are compared with their critical values. The differences between the experimental conditions and the ideal boundary conditions used in the calculations and the partial destruction of quasiperiodic structures as a result of this are also discussed.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>свободная конвекция</kwd><kwd>вытяжная шахта</kwd><kwd>оребренная труба</kwd><kwd>теплопередача</kwd><kwd>приближение Буссинеска</kwd><kwd>уравнение Навье – Стокса</kwd><kwd>уравнение теплопроводности</kwd><kwd>конвективная неустойчивость</kwd><kwd>ячейка Рэлея – Бенара</kwd></kwd-group><kwd-group xml:lang="en"><kwd>free convection</kwd><kwd>exhaust shaft</kwd><kwd>finned tube</kwd><kwd>heat transfer</kwd><kwd>Boussinesq approximation</kwd><kwd>Navier – Stokes equation</kwd><kwd>heat conduction equation</kwd><kwd>convective instability</kwd><kwd>Rayleigh – Bénard cell</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">Bénard, H. 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