Hydrodynamical instability of newtonian flow before an axisymmetric sudden contraction
dc.citation.epage | 38 | |
dc.citation.issue | 2 | |
dc.citation.spage | 32 | |
dc.contributor.affiliation | Національний університет “Львівська політехніка” | |
dc.contributor.affiliation | Lviv Polytechnic National University | |
dc.contributor.author | Орел, В. І. | |
dc.contributor.author | Піцишин, Б. С. | |
dc.contributor.author | Коник, Т. З. | |
dc.contributor.author | Orel, Vadym | |
dc.contributor.author | Pitsyshyn, Bohdan | |
dc.contributor.author | Konyk, Tetiana | |
dc.coverage.placename | Львів | |
dc.coverage.placename | Lviv | |
dc.date.accessioned | 2023-04-10T08:44:35Z | |
dc.date.available | 2023-04-10T08:44:35Z | |
dc.date.created | 2021-11-11 | |
dc.date.issued | 2021-11-11 | |
dc.description.abstract | Заходи зі зменшення втрат енергії в системах трубопровідного транспорту необхідно впроваджувати вже на етапі проектування. Зокрема це стосується й місцевих гідравлічних опорів трубопроводів. Досліджено розміри вирового поясу перед симетричним раптовим звуженням круглої труби за течії ньютонівської рідини. Розглянуто ступені звуження потоку 0,250 та 0,500. Адже заходи, спрямовані на зменшення втрат енергії на раптовому звуженні круглої труби, мають бути ефективними за ступенів звуження потоку не менших ніж 0,250. Розміри вирового поясу мають екстремальну залежність з максимумом під час переходу ламінарного режиму руху рідини в турбулентний. Зі збільшенням значень критерію Рейнольдса за ламінарного режиму ці розміри зростають, а за турбулентного режиму – зменшуються. У першому випадку точка відриву потоку зміщується вверх за течією від площини зміни діаметрів, що узгоджується з даними чисельного моделювання, наведеними в літературі; у другому випадку – донизу за течією. В обох випадках розміри вирового поясу є пропорційними до критерію Рейнольдса. Описана поведінка є аналогічною як для довжини зони повторного приєднання потоку ньютонівської рідини після раптового розширення труби. Перехідна зона між ламінарним і турбулентним режимами руху рідини є в межах від 3000 до 5300 та 750–1300 для критерію Рейнольдса, визначеного за діаметром більшої труби та уступом відповідно. Це узгоджується з наведеними в літературі даними. Висота вирового поясу перед раптовим звуженням круглої труби є меншою за висоту уступу. Відбувається неповний відрив потоку рідин перед перерізом зміни діаметрів. | |
dc.description.abstract | The sizes of the vortex region before the axisymmetric sudden contraction of the circular pipe at the Newtonian flow have been investigated. Area ratios 0.250 and 0.500 were considered. The sizes of the vortex region have the extreme dependence with a maximum at the transition of the laminar flow into a turbulent flow one. When the Reynolds number at the laminar flow increase, these sizes also increase, and they decrease at the turbulent flow. In both cases, the sizes of the vortex region are proportional to the Reynolds number. A transition region between laminar flow and turbulent flow lies in the range of the Reynolds number from 3000 to 5300 and 750–1300, determined by the diameter of a bigger pipe of sudden expansion and a step height correspondingly. | |
dc.format.extent | 32-38 | |
dc.format.pages | 7 | |
dc.identifier.citation | Orel V. Hydrodynamical instability of newtonian flow before an axisymmetric sudden contraction / Vadym Orel, Bohdan Pitsyshyn, Tetiana Konyk // Theory and Building Practice. — Lviv : Lviv Politechnic Publishing House, 2021. — Vol 3. — No 2. — P. 32–38. | |
dc.identifier.citationen | Orel V., Pitsyshyn B., Konyk T. (2021) Hydrodynamical instability of newtonian flow before an axisymmetric sudden contraction. Theory and Building Practice (Lviv), vol. 3, no 2, pp. 32-38. | |
dc.identifier.doi | https://doi.org/10.23939/jtbp2021.02.032 | |
dc.identifier.uri | https://ena.lpnu.ua/handle/ntb/57938 | |
dc.language.iso | en | |
dc.publisher | Видавництво Львівської політехніки | |
dc.publisher | Lviv Politechnic Publishing House | |
dc.relation.ispartof | Theory and Building Practice, 2 (3), 2021 | |
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dc.relation.referencesen | Ando, T. & Shakouchi, T. (2004). Flow characteristics over forward facing step and through abrupt | |
dc.relation.referencesen | contraction pipe and drag reduction. Research Reports of the Faculty of Engineering, 29. Mie: Mie University. | |
dc.relation.referencesen | URL: www.eng.mie-u.ac.jp/research/activities/29/29_1.pdf. | |
dc.relation.referencesen | Arsirij, V. A. (2003). Usovershenstvovanie gidro- i aerodinamiki oborudovaniya s cel'yu povysheniya | |
dc.relation.referencesen | effektivnosti. Proceedings of Odessa Polytechnic University, 2 (20), 1–5. [in Russian] | |
dc.relation.referencesen | Back, L. H., & Roschke, E. J. (1972). Shear-layer flow regimes and wave instabilities and reattachment | |
dc.relation.referencesen | lengths downstream of an abrupt circular channel expansion. Journal of Applied Mechanics, 39 (3), 677–681. DOI: | |
dc.relation.referencesen | https://doi.org/10.1115/1.3422772. | |
dc.relation.referencesen | Bajbakov, O. V., Bashta, T. M., Kirillovskij, Yu. L., Nekrasov, B. B., & Rudnev, S. S. (1982). Gidravlika, | |
dc.relation.referencesen | gidromashiny i gidroprivody: Uchebnik dlya mashinostroitel'nyh vuzov. Moskva: Mashinostroenie. [in Russian] | |
dc.relation.referencesen | Barbosa-Saldana, J. G., Morales-Contreras, O. A., Jimenez-Bernal, J. A., Gutierrez-Torres, C. del C., & MorenoPacheco, L. A. (2013). Numerical and experimental results for flow through a forward facing step channel. | |
dc.relation.referencesen | International Journal of Recent Research and Applied Studies, 15 (2) 177–189. URL: https://www.arpapress.com/ | |
dc.relation.referencesen | Volumes/Vol15Issue2/IJRRAS_15_2_06.pdf. | |
dc.relation.referencesen | Boger, D. V., Hur, D. U., & Binnington, R. J. (1986). Further observations of elastic effects in tubular entry | |
dc.relation.referencesen | flows, Journal of Non-Newtonian Fluid Mechanics, 20, 31–49, DOI: https://doi.org/10.1016/0377-0257(86)80014-3. | |
dc.relation.referencesen | Borzenko, E. I., Ryltseva, K. E., Frolov, O. Yu., & Shrager, G. R. (2017). Calculation of the local resistance | |
dc.relation.referencesen | coefficient of viscous incompressible fluid flow in a pipe with sudden contraction. Tomsk State University Journal | |
dc.relation.referencesen | of Mathematics and Mechanics. 48, 36–48. DOI: https://doi.org/10.17223/19988621/48/4. | |
dc.relation.referencesen | Bullen, P. R., Cheeseman, D. J., & Hussain, L. A. (1996). A study of Turbulent Flow in Pipe Contractions. | |
dc.relation.referencesen | Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering; 210(3), 171–180. DOI: https://doi.org/10.1243/PIME_PROC_1996_210_312_02. | |
dc.relation.referencesen | Chugaev, R. R. (1982). Gidravlika (Tekhnicheskaya mekhanika zhidkosti). Leningrad: Energoizdat, | |
dc.relation.referencesen | Leningradskoe otd-nie. [in Russian] | |
dc.relation.referencesen | Krhan, A., & Giorgini, F. (2016). Numerical investigations of laminar flow in a pipe with a sudden | |
dc.relation.referencesen | contraction of his cross-sectional area. Technical report. Linköping: Linköping University. URL: | |
dc.relation.referencesen | https://www.academia.edu/23612237/Numerical_investigations_of_laminar_flow_in_a_pipe_with_a_sudden_contra | |
dc.relation.referencesen | ction_of_his_cross-sectional_area. | |
dc.relation.referencesen | Kvitkovskij Ju. V. (1986). O strukture i soderzhanii razdela gidrodinamiki ‘Neravnomernoe napornoe | |
dc.relation.referencesen | dvizhenie zhidkosti’. In Metodika prepodavanija gidravliki napornyh techenij (pp. 64–73). Leningrad: | |
dc.relation.referencesen | Leningradskij politehnicheskij institut. [in Russian] | |
dc.relation.referencesen | Moretskiy, V. Y., Zholobov, V. V., & Varybok, D. I. (2017). Influence of mutual placement of technological | |
dc.relation.referencesen | equipment onto hydraulic resistance. Science & Technologies: Oil and Oil Products Pipeline Transportation, 1(28), 53–61. URL: https://elibrary.ru/item.asp?id=28777146. [in Russian] | |
dc.relation.referencesen | Orel, V. I. (2012). Zalezhnist dovzhyny hidrodynamichnoi kintsevoi dilianky vid kryteriiu Reinoldsa pry | |
dc.relation.referencesen | raptovomu zvuzhenni potoku ridyny. III Mizhnarodna konferentsiia ‘Naukovo-tekhnichne ta orhanizatsiino-ekonomichne | |
dc.relation.referencesen | spryiannia reformam u budivnytstvi i zhytlovo-komunalnomu hospodarstvi’. Makiivka, Ukraina. [in Ukrainian] | |
dc.relation.referencesen | Orel, V. I. (2013). Investigation of the proportion of irreversible losses in total pressure losses at the sudden | |
dc.relation.referencesen | narrowing of pipe. Problems of Water supply, Sewerage and Hydraulics, 21, 181–190. [in Ukrainian] | |
dc.relation.referencesen | Palacios-Sanchez, F. M. (2011). Estudo Experimental do Escoamento de Fluido Newtoniano em Contração | |
dc.relation.referencesen | Abrupta Axissimétrica com a Técnica de Velocimetria por Imagem de Partículas. (Dissertação (Mestrado em | |
dc.relation.referencesen | Engenharia)., Universidade Tecnológica Federal do Paraná, Curitiba. URL: www.ppgem.ct.utfpr.edu.br/ | |
dc.relation.referencesen | dissertacoes/SANCHEZ,%20Fredy%20Palacios.pdf. | |
dc.relation.referencesen | Palacios-Sanchez, F., Noguchi-Machuca, J. L., Franco, A. T., & Morales, R. E. M. (2010). Experimental and | |
dc.relation.referencesen | numerical study of turbulent newtonian flow through an axisymmetric sudden contraction. Proceedings of ENCIT 2010. 13th Brazilian Congress of Thermal Sciences and Engineering. Uberlandia, MG, Brazil. URL: | |
dc.relation.referencesen | https://www.abcm.org.br/anais/encit/2010/PDF/ENC10-0572.pdf. | |
dc.relation.referencesen | Popov, A. M. (2000). Razrabotka i realizaciya gidrodinamicheskogo metoda rascheta harakteristik | |
dc.relation.referencesen | drossel'nyh elementov gidroapparatury pri dokriticheskih chislah Rejnol'dsa (Doctor of philosophy dissertation). | |
dc.relation.referencesen | Moskovskij energeticheskij institut (tekhnicheskij universitet), Moskva. [in Russian] | |
dc.relation.referencesen | Reynaud, S., Debray, F., Franc, J. P., & Maitre, T. (2005). Hydrodynamics and heat transfer in twodimensional minichannels. International Journal of Heat and Mass Transfer, 48 (15), 3197–3211. DOI: | |
dc.relation.referencesen | https://doi.org/10.1016/j.ijheatmasstransfer.2005.02.020. | |
dc.relation.referencesen | Samohvalov, A. S. (1989). Zakonomernosti techenij nen'yutonovskih zhidkostej na perekhodnyh uchastkah | |
dc.relation.referencesen | kanalov (Doctor of philosophy dissertation). Kyiv Civil Engineering Institute, Kyiv. [in Russian] | |
dc.relation.referencesen | Tananaev, A. V. (1979). Techenie v kanalah MGD-ustrojstv. Moskva: Atomizdat. [in Russian] | |
dc.relation.referencesen | Wendt, Elis M. S. (2015). Visualização de Escoamento Turbulento de Fluido Newtoniano em Contrações | |
dc.relation.referencesen | Abruptas com a Técnica PIV. Monografia. Curitiba: Universidade Tecnológica Federal do Paraná. URL: | |
dc.relation.referencesen | http://repositorio.roca.utfpr.edu.br/jspui/bitstream/1/10141/1/CT_DAMEC_2016_2_06.pdf. | |
dc.relation.uri | https://doi.org/10.1115/1.3422772 | |
dc.relation.uri | https://www.arpapress.com/ | |
dc.relation.uri | https://doi.org/10.1016/0377-0257(86)80014-3 | |
dc.relation.uri | https://doi.org/10.17223/19988621/48/4 | |
dc.relation.uri | https://doi.org/10.1243/PIME_PROC_1996_210_312_02 | |
dc.relation.uri | https://www.academia.edu/23612237/Numerical_investigations_of_laminar_flow_in_a_pipe_with_a_sudden_contra | |
dc.relation.uri | https://elibrary.ru/item.asp?id=28777146 | |
dc.relation.uri | https://www.abcm.org.br/anais/encit/2010/PDF/ENC10-0572.pdf | |
dc.relation.uri | https://doi.org/10.1016/j.ijheatmasstransfer.2005.02.020 | |
dc.relation.uri | http://repositorio.roca.utfpr.edu.br/jspui/bitstream/1/10141/1/CT_DAMEC_2016_2_06.pdf | |
dc.rights.holder | © Національний університет „Львівська політехніка“, 2021 | |
dc.rights.holder | © Orel V., Pitsyshyn B., Konyk T., 2021 | |
dc.subject | раптове звуження труби | |
dc.subject | діаметр труби | |
dc.subject | висота уступу | |
dc.subject | вировий пояс | |
dc.subject | довжина виру | |
dc.subject | висота виру | |
dc.subject | ступінь звуження потоку | |
dc.subject | критерій Рейнольдса | |
dc.subject | sudden contraction | |
dc.subject | pipe diameter | |
dc.subject | step height | |
dc.subject | vortex region | |
dc.subject | vortex length | |
dc.subject | vortex height | |
dc.subject | area ratio | |
dc.subject | Reynolds number | |
dc.title | Hydrodynamical instability of newtonian flow before an axisymmetric sudden contraction | |
dc.title.alternative | Гідродинамічна нестабільність потоку ньютонівської рідини перед симетричним раптовим звуженням труби | |
dc.type | Article |