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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">techusgu</journal-id><journal-title-group><journal-title xml:lang="ru">Известия Юго-Западного государственного университета. Серия: Техника и технологии</journal-title><trans-title-group xml:lang="en"><trans-title>Proceedings of the Southwest State University. Series: Engineering and Technology</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2223-1528</issn><publisher><publisher-name>Юго-Западный государственный университет</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.21869/2223-1528-2024-14-3-52-64</article-id><article-id custom-type="elpub" pub-id-type="custom">techusgu-264</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>Влияние расположения источника неоднородного  магнитного поля на интенсивность термомагнитной конвекции  в замкнутом контуре</article-title><trans-title-group xml:lang="en"><trans-title>Influence of inhomogeneous magnetic field source location  on the intensity of thermomagnetic convection in a closed loop</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-8140-7774</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Косков</surname><given-names>М. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Koskov</surname><given-names>M. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Косков Михаил Андреевич, младший научный сотрудник</p><p>ул. Акад. Королёва, д. 1, г. Пермь 614013</p><p>Researcher ID: AAN-7092-2020</p></bio><bio xml:lang="en"><p>Mikhail A. Koskov, Junior researcher</p><p>1 Koroleva Str., Perm 614013</p><p>Researcher ID: AAN-7092-2020</p></bio><email xlink:type="simple">koskov.m@icmm.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru">Институт механики сплошных сред Уральского отделения Российской академии наук –  филиал Федерального государственного бюджетного учреждения науки Пермского федерального исследовательского центра Уральского отделения Российской академии наук<country>Россия</country></aff><aff xml:lang="en">Institute of Continuous Media Mechanics of the Ural Branch of Russian Academy of Science<country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2024</year></pub-date><pub-date pub-type="epub"><day>24</day><month>09</month><year>2024</year></pub-date><volume>14</volume><issue>3</issue><fpage>52</fpage><lpage>64</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Косков М.А., 2024</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="ru">Косков М.А.</copyright-holder><copyright-holder xml:lang="en">Koskov M.A.</copyright-holder><license 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://techusgu.elpub.ru/jour/article/view/264">https://techusgu.elpub.ru/jour/article/view/264</self-uri><abstract><sec><title>Цель</title><p>Цель. Получение информации о влиянии расположения источника неоднородного магнитного поля относительно нагреваемого участка вертикального гидродинамического контура, заполненного магнитной жидкостью, на интенсивность конвективного переноса тепла вдоль контура.</p></sec><sec><title>Методы</title><p>Методы. Проведены эксперименты с использованием гидродинамического контура, выполненного из тонкой трубки круглого сечения и расположенного в вертикальной плоскости. Подвод тепла осуществлялся нагревателем на коротком вертикальном участке контура, отвод – обдувом всей поверхности трубки термостатированным воздухом. Источником магнитного поля служили плоские полюсные наконечники ферритового магнитопровода, в зазоре между которыми располагался нагреватель. Расположение полюсных наконечников относительно нагревателя в экспериментах варьировалось по вертикали. При проведении контрольных опытов источник магнитного поля демонтировался. Контур был заполнен магнитной жидкостью типа «магнетит – керосин – олеиновая кислота» умеренной концентрации. Интенсивность стационарного конвективного теплопотока вдоль контура рассчитывалась по результатам измерения температуры поверхности трубки медьконстантановыми термопарами. Результаты измерений представлялись в безразмерном виде – взаимосвязи числа Нуссельта и теплового числа Рэлея.</p></sec><sec><title>Результаты</title><p>Результаты. Установившаяся смешанная, термомагнитная и гравитационная конвекция магнитной жидкости в контуре наблюдалась при любом расположении наконечников магнитопровода относительно нагревателя. При расположении полюсных наконечников выше нагревателя наблюдалась конкуренция гравитационной и термомагнитной конвекции, а поток тепла оказывался слабым. При размещении полюсных наконечников ниже нагревателя число Нуссельта было в 2–4 раза больше, чем в контрольных опытах (только гравитационная конвекция) при равных числах Рэлея. Наибольшие числа Нуссельта получены при размещении источника поля вблизи центра нагревателя.</p></sec><sec><title>Заключение</title><p>Заключение. Информация о влиянии взаимного расположения источника магнитного поля и нагревателя на конвективный перенос тепла магнитной жидкостью в гидродинамическом контуре получена экспериментально. Найдено оптимальное, в смысле интенсивности теплопереноса, положение источника поля.</p></sec></abstract><trans-abstract xml:lang="en"><sec><title>Purpose</title><p>Purpose. Obtaining information on the influence of the location of the inhomogeneous magnetic field source relative to the heated section of a vertical hydrodynamic loop filled with magnetic fluid on the intensity of convective heat transfer along the loop.</p></sec><sec><title>Methods</title><p>Methods. Experiments were carried out using a hydrodynamic loop made of a thin tube of circular cross-section and placed in a vertical plane. Heat source was carried out by a heater on a short vertical section of the loop, and heat removal was implement out by blowing the entire surface of the tube with thermostated air. The source of the magnetic field was the flat pole tips of the ferrite magnetic core, in the gap between which the heater was located. The position of the pole tips relative to the heater varied vertically in the experiments. In the control experiments, the source of the magnetic field was deleted. The circuit was filled with medium concentrated magnetic liquid of the type "magnetite - kerosene - oleic acid". The intensity of steady-state convective heat flow along the tube was calculated from the results of measuring the tube surface temperature by copper-constantane thermocouples. The measurement results were presented in dimensionless form - the relationship between the Nusselt number and Rayleigh number.</p></sec><sec><title>Results</title><p>Results. The unfluctuating mixed, thermomagnetic and gravitational, convection of the magnetic fluid in the loop was observed at any location of the pole tips of the magnetic core relative to the heater. At location of pole tips above the heater, competition of gravitational and thermomagnetic convection was observed, and the heat flux was weak. When the pole tips were placed below the heater, the Nusselt number was 2 - 4 times higher than in the control tests (only gravitational convection) with equal Rayleigh numbers. The highest Nusselt numbers were obtained when the field source was placed in center of the heater.</p></sec><sec><title>Conclusion</title><p>Conclusion. Information on the influence of the relative location of the magnetic field source and the heater on convective heat transfer by magnetic fluid in a hydrodynamic loop is obtained experimentally. The optimal concerning of heat transfer intensity position of the field source was found.</p></sec></trans-abstract><kwd-group xml:lang="ru"><kwd>гидродинамический контур</kwd><kwd>магнитная жидкость</kwd><kwd>термомагнитная конвекция</kwd><kwd>неоднородное магнитное поле</kwd></kwd-group><kwd-group xml:lang="en"><kwd>Hydrodynamic loop</kwd><kwd>magnetic fluid</kwd><kwd>thermomagnetic convection</kwd><kwd>non-uniform magnetic field</kwd></kwd-group><funding-group xml:lang="ru"><funding-statement>Работа выполнена в рамках Программы фундаментальных исследований Российской академии наук (рег. №: AAAA-A20-120020690030-5)</funding-statement></funding-group><funding-group xml:lang="en"><funding-statement>This work was performed within the framework of the Program of Fundamental Research of the Russian Academy of Sciences (registration number:  AAAA-A20-120020690030-5)</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Берковский Б. 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