Error
  • Error loading Modules:Can't create/write to file '/var/lib/mysql/tmp/#sql_bd4_0.MYI' (Errcode: 30) SQL=SELECT id, title, module, position, content, showtitle, control, params FROM jos_modules AS m LEFT JOIN jos_modules_menu AS mm ON mm.moduleid = m.id WHERE m.published = 1 AND m.access <= 0 AND m.client_id = 0 AND ( mm.menuid = 8 OR mm.menuid = 0 ) ORDER BY position, ordering
  • Error loading Modules:Can't create/write to file '/var/lib/mysql/tmp/#sql_bd4_0.MYI' (Errcode: 30) SQL=SELECT id, title, module, position, content, showtitle, control, params FROM jos_modules AS m LEFT JOIN jos_modules_menu AS mm ON mm.moduleid = m.id WHERE m.published = 1 AND m.access <= 0 AND m.client_id = 0 AND ( mm.menuid = 8 OR mm.menuid = 0 ) ORDER BY position, ordering
  • Error loading Modules:Can't create/write to file '/var/lib/mysql/tmp/#sql_bd4_0.MYI' (Errcode: 30) SQL=SELECT id, title, module, position, content, showtitle, control, params FROM jos_modules AS m LEFT JOIN jos_modules_menu AS mm ON mm.moduleid = m.id WHERE m.published = 1 AND m.access <= 0 AND m.client_id = 0 AND ( mm.menuid = 8 OR mm.menuid = 0 ) ORDER BY position, ordering
  • Error loading Modules:Can't create/write to file '/var/lib/mysql/tmp/#sql_bd4_0.MYI' (Errcode: 30) SQL=SELECT id, title, module, position, content, showtitle, control, params FROM jos_modules AS m LEFT JOIN jos_modules_menu AS mm ON mm.moduleid = m.id WHERE m.published = 1 AND m.access <= 0 AND m.client_id = 0 AND ( mm.menuid = 8 OR mm.menuid = 0 ) ORDER BY position, ordering
  • Error loading Modules:Can't create/write to file '/var/lib/mysql/tmp/#sql_bd4_0.MYI' (Errcode: 30) SQL=SELECT id, title, module, position, content, showtitle, control, params FROM jos_modules AS m LEFT JOIN jos_modules_menu AS mm ON mm.moduleid = m.id WHERE m.published = 1 AND m.access <= 0 AND m.client_id = 0 AND ( mm.menuid = 8 OR mm.menuid = 0 ) ORDER BY position, ordering
  • Error loading Modules:Can't create/write to file '/var/lib/mysql/tmp/#sql_bd4_0.MYI' (Errcode: 30) SQL=SELECT id, title, module, position, content, showtitle, control, params FROM jos_modules AS m LEFT JOIN jos_modules_menu AS mm ON mm.moduleid = m.id WHERE m.published = 1 AND m.access <= 0 AND m.client_id = 0 AND ( mm.menuid = 8 OR mm.menuid = 0 ) ORDER BY position, ordering
  • Error loading Modules:Can't create/write to file '/var/lib/mysql/tmp/#sql_bd4_0.MYI' (Errcode: 30) SQL=SELECT id, title, module, position, content, showtitle, control, params FROM jos_modules AS m LEFT JOIN jos_modules_menu AS mm ON mm.moduleid = m.id WHERE m.published = 1 AND m.access <= 0 AND m.client_id = 0 AND ( mm.menuid = 8 OR mm.menuid = 0 ) ORDER BY position, ordering
  • Error loading Modules:Can't create/write to file '/var/lib/mysql/tmp/#sql_bd4_0.MYI' (Errcode: 30) SQL=SELECT id, title, module, position, content, showtitle, control, params FROM jos_modules AS m LEFT JOIN jos_modules_menu AS mm ON mm.moduleid = m.id WHERE m.published = 1 AND m.access <= 0 AND m.client_id = 0 AND ( mm.menuid = 8 OR mm.menuid = 0 ) ORDER BY position, ordering
  • Error loading Modules:Can't create/write to file '/var/lib/mysql/tmp/#sql_bd4_0.MYI' (Errcode: 30) SQL=SELECT id, title, module, position, content, showtitle, control, params FROM jos_modules AS m LEFT JOIN jos_modules_menu AS mm ON mm.moduleid = m.id WHERE m.published = 1 AND m.access <= 0 AND m.client_id = 0 AND ( mm.menuid = 8 OR mm.menuid = 0 ) ORDER BY position, ordering
  • Error loading Modules:Can't create/write to file '/var/lib/mysql/tmp/#sql_bd4_0.MYI' (Errcode: 30) SQL=SELECT id, title, module, position, content, showtitle, control, params FROM jos_modules AS m LEFT JOIN jos_modules_menu AS mm ON mm.moduleid = m.id WHERE m.published = 1 AND m.access <= 0 AND m.client_id = 0 AND ( mm.menuid = 8 OR mm.menuid = 0 ) ORDER BY position, ordering
  • Error loading Modules:Can't create/write to file '/var/lib/mysql/tmp/#sql_bd4_0.MYI' (Errcode: 30) SQL=SELECT id, title, module, position, content, showtitle, control, params FROM jos_modules AS m LEFT JOIN jos_modules_menu AS mm ON mm.moduleid = m.id WHERE m.published = 1 AND m.access <= 0 AND m.client_id = 0 AND ( mm.menuid = 8 OR mm.menuid = 0 ) ORDER BY position, ordering
  • Error loading Modules:Can't create/write to file '/var/lib/mysql/tmp/#sql_bd4_0.MYI' (Errcode: 30) SQL=SELECT id, title, module, position, content, showtitle, control, params FROM jos_modules AS m LEFT JOIN jos_modules_menu AS mm ON mm.moduleid = m.id WHERE m.published = 1 AND m.access <= 0 AND m.client_id = 0 AND ( mm.menuid = 8 OR mm.menuid = 0 ) ORDER BY position, ordering
  • Error loading Modules:Can't create/write to file '/var/lib/mysql/tmp/#sql_bd4_0.MYI' (Errcode: 30) SQL=SELECT id, title, module, position, content, showtitle, control, params FROM jos_modules AS m LEFT JOIN jos_modules_menu AS mm ON mm.moduleid = m.id WHERE m.published = 1 AND m.access <= 0 AND m.client_id = 0 AND ( mm.menuid = 8 OR mm.menuid = 0 ) ORDER BY position, ordering
  • Error loading Modules:Can't create/write to file '/var/lib/mysql/tmp/#sql_bd4_0.MYI' (Errcode: 30) SQL=SELECT id, title, module, position, content, showtitle, control, params FROM jos_modules AS m LEFT JOIN jos_modules_menu AS mm ON mm.moduleid = m.id WHERE m.published = 1 AND m.access <= 0 AND m.client_id = 0 AND ( mm.menuid = 8 OR mm.menuid = 0 ) ORDER BY position, ordering
  • Error loading Modules:Can't create/write to file '/var/lib/mysql/tmp/#sql_bd4_0.MYI' (Errcode: 30) SQL=SELECT id, title, module, position, content, showtitle, control, params FROM jos_modules AS m LEFT JOIN jos_modules_menu AS mm ON mm.moduleid = m.id WHERE m.published = 1 AND m.access <= 0 AND m.client_id = 0 AND ( mm.menuid = 8 OR mm.menuid = 0 ) ORDER BY position, ordering
  • Error loading Modules:Can't create/write to file '/var/lib/mysql/tmp/#sql_bd4_0.MYI' (Errcode: 30) SQL=SELECT id, title, module, position, content, showtitle, control, params FROM jos_modules AS m LEFT JOIN jos_modules_menu AS mm ON mm.moduleid = m.id WHERE m.published = 1 AND m.access <= 0 AND m.client_id = 0 AND ( mm.menuid = 8 OR mm.menuid = 0 ) ORDER BY position, ordering
  • Error loading Modules:Can't create/write to file '/var/lib/mysql/tmp/#sql_bd4_0.MYI' (Errcode: 30) SQL=SELECT id, title, module, position, content, showtitle, control, params FROM jos_modules AS m LEFT JOIN jos_modules_menu AS mm ON mm.moduleid = m.id WHERE m.published = 1 AND m.access <= 0 AND m.client_id = 0 AND ( mm.menuid = 8 OR mm.menuid = 0 ) ORDER BY position, ordering

DESIGNING AND DETAILING OF BUILDING SYSTEMS. MECHANICS IN CIVIL ENGINEERING

DEGREE-BASED VELOCITY DISTRIBUTION INSIDE FLAT AND ROUND TURBULENT FLOWS

Vestnik MGSU 7/2012
  • Skrebkov Gennadiy Petrovich - Chuvash State University named after I.N. Ul’yanov (ChGU) Candidate of Technical Sciences, Associate Professor, Department of Heat and Hydraulic Engineering; +7 (8352) 58-79-26, Chuvash State University named after I.N. Ul’yanov (ChGU), 15 Moskovskiy prospekt, Cheboksary, 428015, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Fedorov Nikolay Anfimovich - Chuvash State University named after I.N. Ul’yanov (ChGU) assistant lecturer, Department of Heat and Hydraulic Engineering; +7 (8352) 67-33-26, Chuvash State University named after I.N. Ul’yanov (ChGU), 15 Moskovskiy prospekt, Cheboksary, 428015, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 90 - 95

The authors propose a general method of identification of exponent within the distribution of velocities of round and flat flows. Resulting formulas do not contain any empirical corrections, and they are confirmed by the experimental data.
Resulting degree-based velocity profiles comply with the results of measurements of flat flows, whereas any disagreement between experiment-based points and their analysis-based counterparts do not exceed any acceptable experimental errors.
The practical equivalence of degree-based and logarithmic velocity profiles may serve as a supplementary condition that makes it possible to identify the degree value without the involvement of any empirical corrections.
The degree-based velocity profile of round flows may be calculated according to the expression .\[n=0,9\sqrt{\lambda }\]. or \[n=1,25\sqrt{{{\lambda }_{\text{}}}},\].. the degree-based velocity profile of flat flows is equal to \[n=1,76\sqrt{{{\lambda }_{\text{}}}},\] as both formulas enjoy experimental and theoretical substantiations.

DOI: 10.22227/1997-0935.2012.7.90 - 95

References
  1. Schiller L. Dvizhenie zhidkostey v trubakh [Movement of Fluids in Pipes]. ONTI Publ., Moscow, 1936, p. 230.
  2. Shevelev F.A. Issledovanie osnovnykh gidravlicheskikh zakonomernostey turbulentnogo dvizheniya v trubakh [Investigation of Basic Hydraulic Laws of the Turbulent Flow in Pipes]. Gosstroyizdat Publ., Moscow, 1953, p. 208.
  3. Nunner W. W?rme?bergang und Druckabfall in rauhen R?hren,VDI Forschungsheft, 1956, no. 45.
  4. Al‘tshul‘ A.D. Gidravlicheskie poteri na trenie v truboprovodakh [Hydraulic Friction Loss in Pipes]. Moscow-Leningrad, Gosenergoizdat Publ., 1963, 256 p.
  5. Bryanskaya Yu.V., Markova I.M., Ostyakova A.V. Gidravlika vodnykh i vzvesenesushchikh potokov v zhestkikh i deformiruemykh granitsakh [Hydraulics of Water and Suspension Flows in Rigid and Deformable Boundaries]. Moscow, ASV Publ., 2009, 264 p.
  6. Loytsyanskiy L.G. Mekhanika zhidkosti i gaza [Fluid and Gas Mechanics]. Moscow, Nauka Publ., 1978, 736 p.
  7. Bogomolov A.I., Borovkov V.S. Mayranovskiy T.G. Vysokoskorostnye potoki so svobodnoy poverkhnost’yu [High-speed Flows with Free Surface]. Moscow, Stroyizdat Publ., 1979, p. 344.
  8. Skrebkov G.P. Parashchenko I.E. O velichine postoyannykh logarifmicheskogo profilya skorosti pri dvizhenii potoka mezhdu gladkimi stenkami [The Value of the Permanent Logarithmic Velocity Profile of the Flow between Smooth Walls]. Izvestiya vuzov. Stroitel’stvo i arkhitektura [Bulletin of Institutions of Higher Education. Construction and Architecture]. Novosibirsk, 1983, no. 2, pp. 88—92.
  9. Skrebkov G.P. O gidravlicheskom soprotivlenii rusel ploskomu potoku [About Hydraulic Resistance of Watercourses to Flat Flows]. Proceedings of VNIIG named after B.E. Vedeneeva, 1981, vol.145, pp. 87—92.
  10. Skrebkov G.P., Parashchenko I.E. Issledovanie kinematicheskoy struktury potoka i pristennogo treniya v trapetseidal’nykh kanalakh so stenkami odinakovoy i raznoy sherokhovatosti [Investigation of the Kinematic Structure of the Flow and Wall Friction in the Trapezoidal Channel with the Walls of Identical and Different Roughnesses]. Vodnye resursy [Aquatic Resources]. 1989, no. 2, pp. 91—96.
  11. Laufer J. Investigation of Turbulent Flow in a Two-Dimensional Channel. NACA, Rep. 1053, 1951, pp. 1—33.
  12. Subbotin V.N. Issledovanie osrednennykh gidrodinamicheskikh kharakteristik turbulentnogo potoka v pryamougol’nom kanale [The Study of Averaged Hydrodynamic Characteristics of the Turbulent Flow in a Rectangular Channel]. Obninsk, Institute of Physics and Power Engineering, Preprint, 1973, no. 455.

Download

LOCAL AND INTEGRAL VALUES OF COEFFICIENTSOF THE TURBULENT VELOCITY PROFILE

Vestnik MGSU 4/2013
  • Skrebkov Gennadiy Petrovich - Chuvash State University named after I.N. Ul’yanov (ChGU) Candidate of Technical Sciences, Associate Professor, Department of Heat and Hydraulic Engineering; +7 (8352) 58-79-26, Chuvash State University named after I.N. Ul’yanov (ChGU), 15 Moskovskiy prospekt, Cheboksary, 428015, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Fedorov Nikolay Anfimovich - Chuvash State University named after I.N. Ul’yanov (ChGU) assistant lecturer, Department of Heat and Hydraulic Engineering; +7 (8352) 67-33-26, Chuvash State University named after I.N. Ul’yanov (ChGU), 15 Moskovskiy prospekt, Cheboksary, 428015, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 201-208

The authors study velocity profiles of turbulent fluid flows, if their cross sections have different shapes. The research is performed using the Karman constant value equal to0.4 and a local parameter of the variable along the velocity profile. An experimentally obtained value of the Karman constant is treated as an integral parameter describing the inclination angle of the velocity profile being constant within the turbulent flow core. In turn, the local parameter describes the local inclination angle of the velocity profile. The authors demonstrate that the local parameter calculated on the basis of maximal and average flow velocities does not relate to the Karman constant, and therefore, it cannotbe used for its validation. The local coefficient can be considered as a supplementary characteristic of the turbulent flow profile. The local parameter and its distribution over the cross section of the flow can be used to clarify the law of resistance, obtained by using the assumption that the Karman constant value is equal to 0.4. Availability of the value of the local parameter distribution over the cross section of the flow may be used to clarify the alteration pattern of the turbulent structure of the flow. Areas of application of both values are also identified.

DOI: 10.22227/1997-0935.2013.4.201-208

References
  1. Skrebkov G.P., Parashchenko I.E. O velichine postoyannykh logarifmicheskogo profilya skorosti pri dvizhenii potoka mezhdu gladkimi stenkami [About the Value of Constants of the Logarithmic Velocity Profile Typical for the Flow Motion in-between Smooth Walls]. Izvestiya vuzov. Stroitel’stvo i arkhitektura [News of Institutions of Higher Education. Construction and Architecture.] 1983, no. 2, pp. 88—92.
  2. Skrebkov G.P., Parashchenko I.E. Isledovanie kinematicheskoy struktury potoka i pristennogo treniya v trapetseidal’nykh kanalakh so stenkami odinakovoy i raznoy sherokhovatosti [Research into Kinematic Flow Structure and Wall-adjacent Friction inside Trapezoidal Channels Having Similar and Different Values of Roughness]. Vodnye resursy [Aquatic Resources]. 1989, no. 2, pp. 91—96.
  3. Skrebkov G.P., Pogasyan A.V. Osobennosti gidrodinamiki turbulentnogo potoka v trubakh kvadratnogo secheniya [Turbulent Flow Mechanics in Square-section Pipes]. Izvestiya vuzov. Energetika [News of Institutions of Higher Education. Energy Engineering.] 1985, no. 8, pp. 116—122.
  4. Al’tshul’ A.D. Gidravlicheskie poteri na trenie v truboprovodakh [Friction Losses inside Pipelines]. Moscow – Leningrad, Gos-energoizdat publ., 1963, 256 p.
  5. Subbotin V.I., Ibragimov M.Kh., Ushakov P.A. Issledovaniya osrednennykh gidrodinamicheskikh kharakteristik turbulentnogo potoka v pryamougol’nom kanale [Research into Averaged Hydrodynamic Characteristics of the Turbulent Flow in the Rectangular Channel]. Preprint of Institute of Physics and Power Engineering (FEI) no. 455. Obninsk, 1973, 49 p.
  6. Shevelev F.A. Issledovaniya osnovnykh gidravlicheskikh zakonomernostey turbulentnogo dvizheniya v trubakh [Research into Principal Hydraulic Laws of Turbulent Motion inside Pipes]. Moscow, Gosudarstvennoe izdatel’stvo po stroitel’stvu i arkhitekture publ., 1953, 208 p.
  7. Zheleznyakov G.V. Propusknaya sposobnost’ rusel kanalov i rek [Throughput Capacity of River and Channel Beds]. Leningrad, Gidrometizdat Publ., 1981, 312 p.
  8. Bryanskaya Yu.V., Markova I.M., Ostyakova A.V. Gidravlika vodnykh i vzvesenesushchikh potokov v zhestkikh i deformiruemykh granitsakh [Hydraulics of Water and Sediment-carrying Flows within Rigid and Deformable Borders]. Moscow, ASV Publ., 2009, 264 p.
  9. Nikuradse J. Untersuchungen ?ber turbulente str?mungen in nicht kreisf?rmigen Rohren. Jngenier-Archiv, 1930, no. 1, pp. 306.
  10. Skrebkov G.P. O gidravlicheskom soprotivlenii rusel ploskomu potoku [About Hydraulic Resistance of Beds to Flat Flows]. Izvestiya VNIIG [News of the All-Russian Scientific and Research Institute of Hydraulic Engineering]. 1982, vol. 145, pp. 87—92.

Download

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.
  4. Kiselev P.G. Gidravlika. Osnovy mekhaniki zhidkosti. [Hydraulics. Fundamentals of Fluid Mechanics]. Moscow, Energiya Publ., 1980, 360 p.
  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.

Download

Results 1 - 3 of 3