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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">10.21869/2223-1528-2024-14-3-40-51</article-id><article-id custom-type="elpub" pub-id-type="custom">techusgu-213</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>О зависимости термического модуля упругости двухкомпонентной магнитной жидкости от частоты, концентрации и магнитного поля</article-title><trans-title-group xml:lang="en"><trans-title>On the dependence of the thermal module of elasticity  of a two-component magnetic fluid on frequency, concentration  and magnetic field</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>Зарифзода</surname><given-names>А. К.</given-names></name><name name-style="western" xml:lang="en"><surname>Zarifzoda</surname><given-names>A. Q.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Зарифзода Афзалшoх Кахрамон, доктор физико-математических наук, директор</p><p>пр. Айни, д. 299/1, г. Душанбе 734063</p></bio><bio xml:lang="en"><p>Afzalshoh Q. Zarifzoda, Doctor of Sciences (Physics and Mathematics), Director</p><p>299/1 Aini Ave., Dushanbe 734063</p></bio><email xlink:type="simple">afzal.z@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>Бозорова</surname><given-names>Ю. К.</given-names></name><name name-style="western" xml:lang="en"><surname>Bozorova</surname><given-names>Yu. K.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Бозорова Юлдузхон Комилджоновна, докторант PhD</p><p>пр. Рудаки, д. 121, г. Душанбе 734003</p></bio><bio xml:lang="en"><p>Yulduzhon K. Bozorova, Doctoral Student PhD</p><p>121 Rudaki Ave., Dushanbe 734003</p></bio><email xlink:type="simple">bozorovaulduzkhon@gmail.com</email><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru">Физико-технический институт им. С.У. Умарова Национальной академии наук Таджикистана<country>Таджикистан</country></aff><aff xml:lang="en">S.U. Umarov Physical-Technical Institute of the National Academy of Sciences of Tajikistan<country>Tajikistan</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru">Таджикский государственный педагогический университет имени Садриддина Айни<country>Таджикистан</country></aff><aff xml:lang="en">S. Aini Tajik State Pedagogical University<country>Tajikistan</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2024</year></pub-date><pub-date pub-type="epub"><day>02</day><month>08</month><year>2024</year></pub-date><volume>14</volume><issue>3</issue><fpage>40</fpage><lpage>51</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Зарифзода А.К., Бозорова Ю.К., 2024</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="ru">Зарифзода А.К., Бозорова Ю.К.</copyright-holder><copyright-holder xml:lang="en">Zarifzoda A.Q., Bozorova Y.K.</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/213">https://techusgu.elpub.ru/jour/article/view/213</self-uri><abstract><sec><title>Цель</title><p>Цель. Исследование зависимости термического модуля упругости двухкомпонентной магнитной жидкости от величины напряженности магнитного поля, частоты внешнего возмущения и объемной концентрации магнитных частиц.</p><p>Метод исследования основан на кинетической теории жидких систем. На основе ранее построенных кинетических уравнений для одночастичной и двухчастичной функций распределения и микроскопического выражения вектора потока тепла получено явное динамическое выражение термического модуля упругости магнитных жидкостей. В быстропротекающих процессах в жидкостях перенос тепла протекает волнообразно и их распространение аналогично распространению второго звука в гелии II. Термический модуль упругости в жидкостях проявляется при высоких частотах и обеспечивает распространению второго звука. Выражение термического модуля упругости состоит из потенциальной и кинетической частей, учитывающих соответственно структурные и трансляционные релаксационные процессы. Для исследования термоупругих свойств магнитных жидкостей для каждой подсистемы выбраны соответствующие выражения потенциальных энергий взаимодействия, позволяющие провести численные расчеты.</p></sec><sec><title>Результаты</title><p>Результаты. Проведены численные расчеты частотной и концентрационной зависимости динамического термического модуля упругости при наличии внешнего магнитного поля в магнитной жидкости на основе керосина. Результаты расчетов показывают, что увеличение воздействия внешнего возмущения приводит к нелинейному возрастанию термического модуля упругости в магнитной жидкости. Рост объемной концентрации магнитных частиц и увеличение значения напряженности магнитного поля также привели к нелинейному возрастанию термического модуля упругости в магнитной жидкости.</p></sec><sec><title>Заключение</title><p>Заключение. Установлено, что вследствие учета трансляционной и структурных релаксационных процессов область частотной дисперсии термического модуля упругости получается широкой. Проведенные численные расчеты при различных значениях внешнего магнитного поля и объемной концентрации магнитных частиц показали, что хотя увеличение магнитного поля и концентрации магнитных частиц приводит к возрастанию термического модуля упругости, их рост на изменение области частотной дисперсии не влияет.</p></sec></abstract><trans-abstract xml:lang="en"><sec><title>Purpose</title><p>Purpose. Study of the dependence of the thermal modulus of elasticity of a two-component magnetic fluid on the magnitude of the magnetic field strength, the frequency of external disturbance and the volumetric concentration of magnetic particles.</p></sec><sec><title>Method</title><p>Method. The research method is based on the kinetic theory of liquid systems. Based on previously constructed kinetic equations for one-particle and two-particle distribution functions and a microscopic expression for the heat flux vector, an explicit dynamic expression for the thermal modulus of elasticity of magnetic fluids is obtained. In fast processes  in liquids, heat transfer occurs in waves and their propagation is similar to the propagation of second sound in helium II. The thermal modulus of elasticity in liquids appears at high frequencies and ensures the propagation of second sound. The expression for the thermal modulus of elasticity consists of potential and kinetic parts, taking into account structural and translational relaxation processes, respectively. To study the thermoelastic properties of magnetic fluids, appropriate expressions of potential interaction energies were selected for each subsystem, allowing for numerical calculations.</p></sec><sec><title>Results</title><p>Results. Numerical calculations of the frequency and concentration dependence of the dynamic thermal modulus of elasticity in the presence of an external magnetic field in a kerosene-based magnetic fluid were carried out. The calculation results show that an increase in the influence of external disturbances leads to a nonlinear increase in the thermal modulus of elasticity in the magnetic fluid. An increase in the volume concentration of magnetic particles and an increase in the magnetic field strength also led to a nonlinear increase in the thermal modulus of elasticity in the magnetic fluid.</p></sec><sec><title>Conclusion</title><p>Conclusion. It has been established that, due to taking into account translational and structural relaxation processes, the region of frequency dispersion of the thermal elastic modulus is wide. Numerical calculations carried out at different values of the external magnetic field and the volume concentration of magnetic particles showed that although an increase in the magnetic field and concentration of magnetic particles leads to an increase in the thermal modulus of elasticity, their increase does not affect the change in the frequency dispersion region.</p></sec></trans-abstract><kwd-group xml:lang="ru"><kwd>магнитная жидкость</kwd><kwd>термический модуль упругости</kwd><kwd>магнитное поле</kwd><kwd>концентрация</kwd><kwd>частота</kwd><kwd>релаксация</kwd></kwd-group><kwd-group xml:lang="en"><kwd>magnetic fluid</kwd><kwd>thermal modulus of elasticity</kwd><kwd>magnetic field</kwd><kwd>concentration</kwd><kwd>frequency</kwd><kwd>relaxation</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">Hong T. K., Yang H. S., Choi C. J. 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