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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">izvkgtu</journal-id><journal-title-group><journal-title xml:lang="ru">Известия КГТУ</journal-title><trans-title-group xml:lang="en"><trans-title>KSTU News</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1997-3071</issn><publisher><publisher-name>Калининградский государственный технический университет</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.46845/1997-3071-2026-82-44-65</article-id><article-id custom-type="elpub" pub-id-type="custom">izvkgtu-219</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>ТЕХНИКА И ТЕХНОЛОГИЯ ПИЩЕВЫХ ПРОИЗВОДСТВ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>PROCESSES AND TECHNOLOGY OF FOOD MANUFACTURING</subject></subj-group></article-categories><title-group><article-title>Динамика слива жидкости Шведова-Бингама из резервуара через цилиндрическую трубу (на примере рыбного жира)</article-title><trans-title-group xml:lang="en"><trans-title>Dynamics of Shvedov-Bingham liquid discharge from the tank through the cylindrical pipe (using fish oil as an example)</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-0560-5933</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Наумов</surname><given-names>В. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Naumov</surname><given-names>V. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Владимир Аркадьевич Наумов – доктор технических наук, профессор, главный научный сотрудник отдела научно-исследовательских и опытно-конструкторских работ КГТУ</p><p>Калининград</p></bio><bio xml:lang="en"><p>Vladimir A. Naumov – Doctor of Technical Sciences, Professor, Chief Researcher of the Department of Research and Development of KSTU</p><p>Kaliningrad</p></bio><email xlink:type="simple">vladimir.naumov@klgtu.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Калининградский государственный технический	университет</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Kaliningrad State Technical University</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2026</year></pub-date><pub-date pub-type="epub"><day>05</day><month>08</month><year>2026</year></pub-date><volume>1</volume><issue>82</issue><fpage>44</fpage><lpage>65</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Наумов В.А., 2026</copyright-statement><copyright-year>2026</copyright-year><copyright-holder xml:lang="ru">Наумов В.А.</copyright-holder><copyright-holder xml:lang="en">Naumov V.A.</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://journal.klgtu.ru/jour/article/view/219">https://journal.klgtu.ru/jour/article/view/219</self-uri><abstract><p>В процессе очистки и применения рыбного жира (РЖ) нередко используется течение по трубопроводу под действием силы тяжести. Экспериментальные исследования ряда авторов показали, что реологические свойства РЖ хорошо  описываются  моделью  вязко-пластичной  жидкости  Шведова-Бингама (ЖШБ), причем по мере очистки РЖ предельное напряжение σ и пластическая вязкость η уменьшаются. Особенностью задачи является снижение перепада давления по мере уменьшения глубины слоя ЖШБ в резервуаре. В результате характеристики движения ЖШБ (радиус и скорость квазитвердого течения, коэффициент Кориолиса и др.) изменяются в процессе слива. В общем случае динамика слива ЖШБ из резервуара через цилиндрическую трубу в нестационарной постановке описывается системой двух дифференциальных уравнений. Приведение этой системы уравнений к безразмерной форме позволило определить 6 критериев подобия поставленной задачи Коши: аналог числа Струхала Str, отношение длины всего трубопровода и его вертикальной части к исходной глубине ЖШБ в резервуаре (соответственно, l и a), модифицированное число Рейнольдса, отношение сил предельного касательного напряжения к силам тяжести Θ, отношение сил тяжести к силам инерции Ψ. Первые 3 критерия определяются геометрическими параметрами гидравлической системы, три последних зависят от реологических свойств ЖШБ. Задача Коши была решена численным методом. Результаты численного анализа показали, чем больше значение Str, тем меньшая скорость течения в трубе может быть достигнута и больше время ее достижения. При Str &lt; 1 задачу можно решать в квазистационарном приближении. В качестве примера была решена задача динамики слива образцов РЖ сома из резервуара. Установлено, что время полного слива РЖ из резервуара уменьшается по стадиям очистки, причем для неочищенного РЖ это время значительно больше, чем у других образцов РЖ. Во всех исследованных условиях число Бингама оставалось больше единицы, что говорит о невозможности использования реологической модели ньютоновской жидкости.</p></abstract><trans-abstract xml:lang="en"><p>Gravity flow is often used in the process of cleaning and applying fish oil (FO). Experimental studies by a number of authors have shown that the rheological properties of FO are well described by the Shvedov-Bingham viscous-plastic fluid (SBL) model. Moreover, as the rye is cleaned, the limiting stress σ and the plastic viscosity nn decrease. A special feature of the task is to reduce the pressure drop as the depth of the SBL layer in the tank decreases. As a result, the characteristics of the SBL motion (the radius and velocity of the quasi-solid flow, the Coriolis coefficient, etc.) change during the discharge process. In the general case, the dynamics of the discharge of liquid fuel from the tank through a cylindrical pipe in a non-stationary formulation is described by a system of two differential equations. Reducing this system of equations to a dimensionless form made it possible to determine 6 criteria for the similarity of the Cauchy problem: the analogue of the Strouhal number Str, the ratio of the length of the entire pipeline and its vertical part to the initial depth of the reservoir (respectively, l and a), the modified Reynolds number, the ratio of the forces of marginal tangential stress to gravity forces Θ, the ratio gravity to inertia forces. The first 3 criteria are determined by the geometric parameters of the hydraulic system, the last three depend on the rheological properties of the hydraulic fluid. The Cauchy problem has been solved numerically. The results of the numerical analysis shows that the higher the value of Str is , the lower the flow rate in the pipe can be achieved and the longer the time to achieve it. For Str &lt; 1, the problem can be solved in the quasi-stationary approximation. As an example, the problem of dynamics of the discharge of FO samples from the tank has been solved. It has been found that the time for the complete discharge of FO from the tank decreases according to the stages of purification. Moreover, for unpeeled FO, this time is much longer than for other OF samples. In all the conditions studied, the Bingham number remained large, which indicates the impossibility of using the rheological model of a Newtonian fluid.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>рыбный жир</kwd><kwd>стадии очистки</kwd><kwd>модель Шведова-Бингама</kwd><kwd>динамика слива</kwd><kwd>задача Коши</kwd><kwd>критерии подобия</kwd><kwd>численный анализ</kwd></kwd-group><kwd-group xml:lang="en"><kwd>fish oil</kwd><kwd>purification stages</kwd><kwd>Shvedov-Bingham model</kwd><kwd>drain dynamics</kwd><kwd>Cauchy problem</kwd><kwd>similarity criteria</kwd><kwd>numerical analysis.</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">исследование выполнено в рамках государственного задания НИОКР «Разработка и совершенствование продукционных систем пищевой отрасли».</funding-statement><funding-statement xml:lang="en">the research was carried out within the framework of the state assignment of research and development work "Development and improvement of food industry production systems".</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">Махутова, О. 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