techusguИзвестия Юго-Западного государственного университета. Серия: Техника и технологииProceedings of the Southwest State University. Series: Engineering and Technology2223-1528Юго-Западный государственный университет10.21869/22231528-2022-12-4-152-167techusgu-26Research ArticleФИЗИКАPHYSICSДинамическое поведение газовых пузырьков и капель в магнитной жидкости в микрожидкостных чипах различной конфигурации в неоднородном магнитном полеDynamic Behavior of Gas Bubbles and Droplets in a Magnetic Liquid in Microfluidic Chips of Various Configuration in an Inhomogeneous Magnetic FieldКалюжнаяД. А.KalyuzhnayaD. A.

Калюжная Дарья Анатольевна, магистрант кафедры нанотехнологий, микроэлектроники, общей и прикладной физики

ул. 50 лет Октября 94, г. Курск 305040

Daria A. Kalyuzhnaya, Undergraduate of the Department of Nanotechnology, Microelectronics, General and Applied Physics

50 Let Oktyabrya Str. 94, Kursk 305040

kalyuzhnaya.dariya@yandex.ruhttps://orcid.org/0000-0002-9069-010XСоколовЕ. А.SokolovE. A.

Соколов Евгений Александрович, аспирант кафедры нанотехнологий, микроэлектроники, общей и прикладной физики

ул. 50 лет Октября 94, г. Курск 305040

Evgeny A. Sokolov, Post-Graduate Student of the Department of Nanotechnology, Microelectronics, General and Applied Physics

50 Let Oktyabrya Str. 94, Kursk 305040

evgeniysokolov1@yandex.ruВасильеваА. О.VasilyevaA. O.

Васильева Анастасия Олеговна, магистрант кафедры нанотехнологий, микроэлектроники, общей и прикладной физики

ул. 50 лет Октября 94, г. Курск 305040

Anastasia O. Vasilyeva, Undergraduate of the Department of Nanotechnology, Microelectronics, General and Applied Physics

50 Let Oktyabrya Str. 94, Kursk 305040

vasilyeva.ao@mail.ruСутаринаИ. Ю.SutarinaI. Yu.

Сутарина Ирина Юрьевна, магистрант  кафедры нанотехнологий, микроэлектроники, общей и прикладной физики

ул. 50 лет Октября 94, г. Курск 305040

Irina Yu. Sutarina, Undergraduate of the Department of Nanotechnology, Microelectronics, General and Applied Physics

50 Let Oktyabrya Str. 94, Kursk 305040

sutarinaira@gmail.comШельдешоваЕ. В.Shel’deshovaE. V.

Шельдешова Елена Владимировна, старший преподаватель кафедры нанотехнологий,  микроэлектроники, общей и прикладной  физики

ул. 50 лет Октября 94, г. Курск 305040

Elena V. Shel’deshova, Senior Lecturer of the Department of Nanotechnology, Microelectronics, General and Applied Physics

50 Let Oktyabrya Str. 94, Kursk 305040

blackberry__@mail.ruhttps://orcid.org/0000-0001-7712-0682РяполовП. А.RjapolovP. A.

Петр Алексеевич Ряполов, доктор физикоматематических наук, доцент, декан естественно-научного факультета

ул. 50 лет Октября 94, г. Курск 305040

Petr A. Rjapolov, Dr. of Sci. (Physics and Mathematics), Associate Professor, Dean of the Faculty of Natural Sciences

50 Let Oktyabrya Str. 94, Kursk 305040

piter@yandex.ruЮго-Западный государственный университетРоссияSouthwest State UniversityRussian Federation202226042023124152167Copyright © Калюжная Д.А., Соколов Е.А., Васильева А.О., Сутарина И.Ю., Шельдешова Е.В., Ряполов П.А., 20232023Калюжная Д.А., Соколов Е.А., Васильева А.О., Сутарина И.Ю., Шельдешова Е.В., Ряполов П.А.Kalyuzhnaya D.A., Sokolov E.A., Vasilyeva A.O., Sutarina I.Y., Shel’deshova E.V., Rjapolov P.A.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://techusgu.elpub.ru/jour/article/view/26Цель

Цель. Исследовать динамическое поведение газовых пузырьков и капель в магнитной жидкости в микрожидкостных чипах различной конфигурации в неоднородном магнитном поле.

Методы

Методы. Исследование проводилось на экспериментальной установке для изучения многофазных систем в микроканалах, разработанной на основе известных методов. В качестве источника магнитного поля использовался кольцевой постоянный магнит, для подачи жидкостей в микрофлюидный чип использовался двухканальный шприцевой насос, изготовленный из набора для сборки 3D-принтера. Динамика капельных и пузырьковых течений фиксировалась с помощью оптического микроскопа. Микрофлюидные устройства изготовлены двумя способами: на основе сэндвич-структур с плёнкой парафильм и по технологии ESCARGOT.

Результаты

Результаты. Проведен ряд экспериментов, в которых исследуется гидродинамика и гидроаэродинамика различных немагнитных и магнитных жидкостей в микрофлюидных чипах. Показано, как смачиваемость стенок микрофлюидных устройств влияет на формирование капель в канале. Результаты исследования зависимости размера немагнитных включений от изменения скорости потока магнитной жидкости показали, что объем генерируемых капель воды уменьшается за счет увеличения скорости потока непрерывной фазы или усиления напряженности магнитного поля, действующего на магнитную многофазную систему.

Вывод

Вывод. В процессе проведения эксперимента установлено, что формирование капель в канале лучше всего прослеживалось в чипах на основе силиконового компаунда, где непрерывной средой являлось минеральное или синтетическое масло. Было определено, что размер и поверхность микроканала также оказывают влияние на образование эмульсий в микроканалах. Выбранная конфигурация чипа (фокусировка потока) является оптимальной для изучения немагнитных включений в МЖ, поэтому такой вид микрофлюидных устройств будет более перспективным для дальнейших исследований капельной гидродинамики в микрофлюидных системах.

Purpose

Purpose. To investigate the dynamic behavior of gas bubbles and droplets in a magnetic liquid in microfluidic chips of various configurations in an inhomogeneous magnetic field.

Methods

Methods. The study was carried out on an experimental setup for studying multiphase systems in microchannels, developed on the basis of known methods. An annular permanent magnet was used as a magnetic field source, and a two-channel syringe pump made from a 3D printer assembly kit was used to supply liquids to the microfluidic chip. The dynamics of drop and bubble flows was recorded using an optical microscope. Microfluidic devices are made in two ways: based on sandwich structures with Parafilm film and using ESCARGOT technology.

Results

Results. The paper presents an experimental setup for the study of multiphase systems in microchannels. A number of experiments have been carried out in which the hydrodynamics and hydroaerodynamics of various non-magnetic and magnetic fluids in microfluidic chips are investigated. It is shown how the wettability of the walls of microfluidic devices affects the formation of droplets in the channel. The results of the study of the dependence of the size of nonmagnetic inclusions on the change in the magnetic fluid flow rate showed that the volume of generated water droplets decreases due to an increase in the continuous phase flow rate or an increase in the magnetic field strength acting on a magnetic multiphase system.

Conclusion

Conclusion. During the experiment, it was found that the formation of droplets in the channel was best traced in chips based on a silicone compound, where mineral or synthetic oils were the continuous medium. It was determined that the size and surface of the microchannel also influences the formation of emulsions in microchannels. The chosen chip configuration (flow focusing) is optimal for studying non-magnetic inclusions in MF, therefore, this type of microfluidic devices will be more promising for further studies of droplet hydrodynamics in microfluidic systems.

микрофлюидикамагнитные жидкостимикрофлюидный чипэмульсиякапельный потокмагнитное полеmicrofluidicsmagnetic fluidsmicrofluidic chipemulsiondrip flowmagnetic fieldПубликация подготовлена в рамках реализации программы стратегического академического лидерства «Приоритет-2030» (Соглашения № 075-15-2021-1155 и № 075-15-2021-1213) и при поддержке гранта РНФ № 22-22-003113 https://rscf.ru/project/22-22-00311/.The publication was prepared as part of the implementation of the program of strategic academic leadership "Priority-2030" (Agreements No. 075-15-2021-1155 and No. 075-15-2021-1213) and with the support of the RSF grant No. 22-22-003113 https://rscf .ru/project/22-22-00311/.ReferencesSquires T. M., Quake S. R. Microfluidics: Fluid physics at the nanoliter scale // Reviews of modern physics. 2005. Vol. 77, no. 3. P. 977.Squires T. M., Quake S. R. Microfluidics: Fluid physics at the nanoliter scale. 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The authors declare that there are no conflicts of interest present.