najoNanosystems: Physics, Chemistry, MathematicsНаносистемы: физика, химия, математика2220-80542305-7971Университет ИТМОnajo-1235Research ArticlePHYSICSФИЗИКАInternal Pressure Measurements in Microchannels of Different ShapesИзмерение давления внутри микроканалов различной формыАнискинВ. М.AniskinVladimir

Анискин Владимир Михайлович, к.ф.-м.н., ст. науч. сотр.,

Новосибирск.

Aniskin Vladimir, PhD, Senior Staff Scientist,

Novosibirsk.

aniskin@itam.nsc.ruАдаменкоК. В.AdamenkoKsenia

Адаменко Ксения Владимировна, аспирант,

Новосибирск.

Adamenko Ksenia, Postgraduate Student,

Novosibirsk.

adamenko_ksenia@mail.ruМасловА. А.MaslovAnatoliy

Маслов Анатолий Александрович, д.ф.-м.н., профессор,

Новосибирск.

Maslov Anatoliy, Deputy Director, Phd, Professor, 

Novosibirsk.

maslov@itam.nsc.ruИнститут теоретической и прикладной механики им. С.А. Христиановича СО РАНРоссияKhristianovich Institute of Theoretical and Applied MechanicsRussian FederationНовосибирский государственный университетРоссияNSURussian Federation201220082025323746Copyright © Aniskin V., Adamenko K., Maslov A., 20252025Анискин В.М., Адаменко К.В., Маслов А.А.Aniskin V., Adamenko K., Maslov A.This work is licensed under a Creative Commons Attribution 4.0 License.https://nanojournal.ifmo.ru/jour/article/view/1235

This paper presents the experimental results of determining friction factors for two microchannels with circular cross-sections: rectilinear and curvilinear. The inner diameter of the channels is 68.9 and 70.3 mm. The Reynolds numbers ranged from 320 to 3215. Pressure measurements are carried out simultaneously in 16 locations along the straight microchannel and in 12 locations for the curved microchannel. The friction factor for the straight microchannel is in good agreement with the theoretical value for the round smooth tubes. For the curved microchannel, the friction factor value of the curved section is less than the reference value for smoothly curved tubes. The Reynolds number for the laminar-turbulent transition in a straight microchannel is 2300–2600. In the curved microchannel the transition is not observed. The length of the developing region was identified, and the inlet minor loss coefficient is calculated.

В статье представлены экспериментальные результаты по определению коэффициента гидравлического сопротивления двух микроканалов круглого сечения: прямолинейного и криволинейного. Внутренний диаметр микроканалов составлял 68,9 и 70,3 мкм соответственно. Число Рейнольдса менялось в диапазоне от 320 до 3215. Измерения давления выполнялись одновременно в 16 точках для прямолинейного микроканала и 12 точках в случае криволинейного микроканала. Коэффициент гидравлического сопротивления для прямолинейного микроканала находится в хорошем согласовании с теоретическим значением для гладких круглых труб. Для криволинейного микроканала коэффициент гидравлического сопротивления криволинейной части оказался меньше справочного значения для плавно изогнутых труб. Число Рейнольдса ламинарно-турбулентного перехода в прямолинейном микроканале составляло 2300-2600. В криволинейном микроканале перехода зафиксировано не было. Определена длина области развивающегося течения и вычислены коэффициенты сопротивления входных участков. 

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The authors declare that there are no conflicts of interest present.