HYDRODYNAMICAL INSTABILITY OF NEWTONIAN FLOW BEFORE AN AXISYMMETRIC SUDDEN CONTRACTION-Reference-Cited by-同舟云学术

HYDRODYNAMICAL INSTABILITY OF NEWTONIAN FLOW BEFORE AN AXISYMMETRIC SUDDEN CONTRACTION

Published:2021-12-15 Issue:2 Volume:2021 Page:32-38
ISSN:2707-1057
Container-title:Theory and Building Practice
language:
Short-container-title:Theory build. pract.

Author:

Orel Vadym^ORCID, ,Pitsyshyn Bohdan^ORCID,Konyk Tetiana^ORCID, ,

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

Publisher

Lviv Polytechnic National University

Reference21 articles.

1. Ando, T. & Shakouchi, T. (2004). Flow characteristics over forward facing step and through abrupt contraction pipe and drag reduction. Research Reports of the Faculty of Engineering, 29. Mie: Mie University. URL: www.eng.mie-u.ac.jp/research/activities/29/29_1.pdf.

2. Arsirij, V. A. (2003). Usovershenstvovanie gidro- i aerodinamiki oborudovaniya s cel'yu povysheniya effektivnosti. Proceedings of Odessa Polytechnic University, 2 (20), 1-5. [in Russian]

3. Back, L. H., & Roschke, E. J. (1972). Shear-layer flow regimes and wave instabilities and reattachment lengths downstream of an abrupt circular channel expansion. Journal of Applied Mechanics, 39 (3), 677-681. DOI: https://doi.org/10.1115/1.3422772.

4. Bajbakov, O. V., Bashta, T. M., Kirillovskij, Yu. L., Nekrasov, B. B., & Rudnev, S. S. (1982). Gidravlika, gidromashiny i gidroprivody: Uchebnik dlya mashinostroitel'nyh vuzov. Moskva: Mashinostroenie. [in Russian]

5. Barbosa-Saldana, J. G., Morales-Contreras, O. A., Jimenez-Bernal, J. A., Gutierrez-Torres, C. del C., & Moreno-Pacheco, L. A. (2013). Numerical and experimental results for flow through a forward facing step channel. International Journal of Recent Research and Applied Studies, 15 (2) 177-189. URL: https://www.arpapress.com/Volumes/Vol15Issue2/IJRRAS_15_2_06.pdf.