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DESIGNING AND DETAILING OF BUILDING SYSTEMS. MECHANICS IN CIVIL ENGINEERING

Hydraulic characteristics of turbulent flows inside pipes and broad channels

Vestnik MGSU 9/2012
  • Baykov Vitaliy Nikolaevich - Moscow State University of Civil Engineering (MGSU) Senior Lecturer, Department of Hydraulics 8 (499) 261-39-12, Moscow State University of Civil Engineering (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Bryanskaya Yuliya Vadimovna - National Research University Moscow State University of Civil Engineering (MGSU) Candidate of Technical Sciences, Associate Professor, Department of Hydraulics; +7 (499) 261-39-12., National Research University Moscow State University of Civil Engineering (MGSU), 129337, Moscow, 26 Yaroslavskoe shosse; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Volynov Mikhail Anatolevich - All-Russian Research Institute of Hydraulic Engineering and Land Reclamation named after A.N. Kostyakov (VNIIGIM) Candidate of Technical Sciences, Associate Professor, Head of Department of Water Resources Management, All-Russian Research Institute of Hydraulic Engineering and Land Reclamation named after A.N. Kostyakov (VNIIGIM), 44 Bolshaya Akademicheskaya st., Moscow, 127550, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 60 - 66

In the article, the authors provide their summarized findings concerning the difference between
the mean velocity determined on the basis of the discharge rate and through the integration
of the velocity profi le alongside the pipe radius. The authors have identified the ratio between these
velocities, which is confirmed by the experimental data obtained for pipes and channels. The equation
characterizing the ratio of these velocities has also been derived.
The analysis of compatibility of dynamic and kinematic characteristics of in-pipe and wide
flows has been performed. This analysis demonstrates that the coefficient of hydraulic resistance
of in-pipe and wide flows can vary up to 10-20 % despite the identical hydraulic radius and the
tension of friction. This difference is caused by the difference in the mean velocities of in-pipe flows.
The authors demonstrate that the coincidence between the equations of hydraulic resistance
of in-pipe and wide flows is attainable when the numerical exponent of the velocity profile inside
pipes and channels is different.
The quantitative correlation between the hydraulic resistance coefficient and the numerical
exponent of the velocity profile for channel flows is identified. This correlation is substantiated by
the experimental data.

DOI: 10.22227/1997-0935.2012.9.60 - 66

References
  1. Zegzhda A.P. Gidravlicheskie poteri na trenie v kanalakh i truboprovodakh [Hydraulic Friction Losses in Channels and Pipes]. Moscow, Gos. izd-vo liter. po stroit. i arkhitekt. [State Publishing House Specializing in Civil Engineering and Architecture], 1957, 277 p.
  2. Al’tshul’ A.D. Gidravlicheskie soprotivleniya [Hydraulic Resistance]. Moscow, Nedra Publ., 1982, 222 p.
  3. Baykov V.N., Volynov M.A., Pisarev D.V. Srednyaya skorost’ i gidravlicheskoe soprotivlenie pri laminarnom techenii v trubakh i shirokikh kanalakh [Average Velocity and Hydraulic Resistance of the Laminar Flow in Channels and Pipes]. Vestnik MGSU [Proceedings of Moscow State University of Civil Engineering]. 2010, no. 2, pp. 186—188.
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  5. Shlikhting G. Teoriya pogranichnogo sloya [Theory of the Boundary Layer]. Moscow, Nauka Publ., 1974, 742 p.
  6. Nikuradze I. Zakonomernosti turbulentnogo dvizheniya v gladkikh trubakh [Turbulent Motion Patterns inside Smooth Pipes]. Problemy turbulentnosti [Problems of Turbulence]. Moscow – Leningrad, ONTI NKTP Publ., 1936, pp. 75—150.
  7. Nikuradze I. Stroemungsgesetze in rauhen Rohren. Forschungs-Heft (Forschungs auf dem Gebiete des Ingenieur-Wesens). 1933, no. 361, pp. 1—22.
  8. Bogomolov A.I., Borovkov V.S., Mayranovskiy F.G. Vysokoskorostnye potoki so svobodnoy poverkhnost’yu [High-speed Free Surface Flows]. Moscow, Stroyizdat Publ., 1979, 344 p.
  9. Bryanskaya Yu.V., Baykov V.N., Volynov M.A. Metodicheskie osnovy obrabotki dannykh gidrologicheskikh izmereniy rechnykh potokov na pryamolineynykh uchastkakh rusel [Methodology of Processing of Hydrologic Data of River waterfl ows in Straightforward Beds]. Gidrotekhnicheskoe stroitel’stvo [Hydraulic Construction]. 2010, no. 11, pp. 60—64.

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