Pressure loss at unsteady motion of incompressible fluid in the pipeline

Authors

DOI:

https://doi.org/10.15587/1729-4061.2013.18521

Keywords:

unsteady, non-stationary, fluid motion, velocity distribution, flow structure, pressure loss, inertial pressure

Abstract

The analysis of available literature data on unsteady motion of fluid was made. It was shown that the velocity distribution at unsteady motion does not correspond to the velocity distribution peculiar to steady motion. According to the literature data, the change of velocity distribution in pressure pipelines during unsteady motion is little studied experimentally. The irregularity of velocity distribution on the effective cross-section is not taken into account during the determination of inertial pressure in the used calculation methods. When analyzing the experimental data it was revealed that at the present level of practical hydrodynamics necessary information about the flow structure can be obtained by the flow visualization with simultaneous measurement of velocity fields and turbulence characteristics. Based on the experimental and theoretical studies an improved method was suggested for determining the pressure loss at unsteady motion of incompressible fluid in pipelines.

Author Biographies

Роман Маріанович Гнатів, National University "Lviv Polytechnic" vul. Dubrova, 4, Lvivska region, m. Striy, 82400

Ph.D., associate professor
Department of Hydraulic Engineers

Олег Михайлович Яхно, National Technical University of Ukraine "Kyiv Polytechnic Institute" Avenue, 37, Kyiv, 03056

Doctor of Technical Sciences, Professor
Applied fluid mechanics and mehanotroniky

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Published

2013-10-31

How to Cite

Гнатів, Р. М., & Яхно, О. М. (2013). Pressure loss at unsteady motion of incompressible fluid in the pipeline. Eastern-European Journal of Enterprise Technologies, 5(7(65), 41–44. https://doi.org/10.15587/1729-4061.2013.18521

Issue

Vol. 5 No. 7(65) (2013): Applied mechanics

Section

Applied mechanics

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Copyright (c) 2014 Роман Маріанович Гнатів, Олег Михайлович Яхно

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