LOCKED AIR VOLUME AS A CONFIDENCE FACTOR IN DETERMINING THE VOLUMETRIC STRENGTH OF A LIQUID

Authors

  • K. K. Layko South Ural State University, Chelyabinsk, Сhelyabinsk Compressor Plant

Keywords:

fracturing pressure, liquid volume strength, oil diagnostics, initial cavitation stage, locked volume

Abstract

Diagnostics of the condition of working fluids and oils in the field of direct operation always remains anurgent task of the quality control departments of enterprises and industries that use them for the needs of their own machine park or for filling the manufactured products. Inappro-priate storage conditions in ware houses and terminals, unscrupulous manufacturers and suppli-ers, fake quality certificates and other factors of the modern developed market economy lead to a situation where equipment is filled with working liquids and oils with unknown, distorted char-acteristics. One important characteristic is the foaming resistance of the liquid. It is of particular importantce for compress requipment, power and machine-tool hydraulic drive. The modes of a brupt pressure drop, rarefaction, flow separation from the channel profile and other influences can cause a rupture in the continuity of the liquid with the formation of gas bubbles and opens. In this case, there lubrication interval is violated, overheating and premature wear of equipment occur, cavitation develops. Despite the fact that the study of fluid rupture has been going on for more than a decade, a reliable and reproducible method of diagnosing it has not been found. Quite well known among the methods is the rupture of liquid in a sealed chamber with a gradual-ly increasing volume – a bellows. The article on the basis of there search conducted by the au-thor analyzes them in reliability factor of this method – the presence of air accidentally locked in the chamber.

References

Корнфельд, М. Методы и результаты исследования объемной упругости веще-ства [Электронный ресурс] / М. Корнфельд // Успехи физических наук. – Режим доступа: http://www.ebiblioteka.lt/resursai/Uzsienio%20leidiniai/ Uspechi_Fiz_Nauk/1954/10/ufn54_10_04.pdf.(дата обращения 20.11.2021 г.)

Корнфельд, М. Упругость и прочность жидкостей / М. Корнфельд. – М., Л.: Гос-техтеоретиздат, 1957. – 110 с.

Хейуорд, А. Отрицательные давления в жидкостях. Как их заставить служить человеку [Электронный ресурс] / А. Хейуорд // Успехи физических наук. – Режим доступа: http://www.ebiblioteka.lt/resursai/ Uzsienio%20leidiniai/Uspechi_Fiz_Nauk/1972/10/r7210e.pdf (дата обращения 20.11.2021 г.)

Хохлов, В.А. Электрогидравлический следящий привод / В.А. Хохлов. – М.: Наука, 1964. – 230 с.

Trevena, D.H. Theoretical values for the tensile strength of certain liquids // J. Phys. D: Appl. Phys. – 1975. – V. 8. – P. L144–L147.

Vincent, R.S. Examination of the Berthelot method of measuring tension in liquids // Proc. Phys. Soc. (London). – 1941. – V. 55. – No. 6. – P. 376–382.

Vincent, R.S. The viscosity tonometer - a new method of measuring tension in liquids // Proc. Phys. Soc. (London). – 1941. – V. 55. –No. l. – P. 4–48.

Биркгоф, Г. Струи следы и каверны / Г. Биркгоф, Э. Сарантонелло; пер. с англ. В.П. Вахомчика, М.М. Литвинова; под ред. Г.Ю. Степанова. – М.: Мир, 1964.

Пирсол, И. Кавитация / И. Пирсол; пер. с англ. Ю.Ф. Журавлева. – М.: Мир, 1975. – 98 с.

Пильгунов, В.Н. Исследование разрывной прочности минерального масла / В.Н. Пильгунов // Наука и образование: электронный научно-технический журнал. – М.: Изд-во МГТУ им. Н.Э. Баумана, 2012. – 17 с.

Vincent, R.S. The measurement of tension in liquids by means of a metal bellows // Proc. Phys. Soc. (London). – 1941. – V. 53. – P. 126–140.

Еремьянц, В.Э. К методике экспериментальных исследований влияния давления жидкости на ее объемный модуль упругости / В.Э. Еремьянц, Б.С. Султаналиев // Машино-ведение. – 2019. – № 1 (9). – С. 82–90.

Юр, Г.С. Численное исследование процесса кавитации в капле жидкости / Г.С. Юр, С.В. Пинясов // Морские интеллектуальные технологии. – 2019. – № 1-3 (43). – С. 53–56.

Delale, C.F. Homogeneous bubble nucleation in liquids: the classical theory revisited / C.F. Delale, J. Hruby, F. Marsik // J. Chem. Phys. – 2003. – V.118. – Nо. 2. – P. 792–806.

Morch, K.A. Cavitation nuclei: experiments and theory / K.A. Morch // J. of Hydro-dymamics. – 2009. – V. 21. – Nо. 2. – P. 176–189.

Study of the Bertholet method for determining the tensile strength of a liquid / D.F. Scott, D.P. Shoemark, K.N. Tanner, J.G. Wendel // J. Chem. Phys – 1948. – V. 16. – P. 495–502.

Brennen, C.E. Cavitation and bubble dynamics / C.E. Brennen – Oxford University Press. USA, 1995. – 282 p.

Cosden, I.A. Effect of cut-off radius on the surface tension of nanoscale bubbles / I.A. Cosden, J.R. Lukes // J. Heat Transfer. – 2011. – V. 133. – Nо. 10. – P. 101–501.

Hansen, J.P., Theory of Simple Liquids / J.P. Hansen, I.R. McDonald – Academic Press, London, 2006. – 428 p.

ГОСТ 15150–69. Машины, приборы и другие технические изделия. Исполнения для различных климатических районов. Категории, условия эксплуатации, хранения и транс-портирования в части воздействия климатических факторов внешней среды. – М.: Стандартинформ, 2010.

Published

2022-02-15

Issue

Section

Verification and test