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HYDRAULICS. ENGINEERING HYDROLOGY. HYDRAULIC ENGINEERING

Effect of fine-dispersed inclusions on the critical velocity analysis in the two-phase flow

Vestnik MGSU 11/2014
  • Volgina Lyudmila Vsevolodovna - Moscow State University of Civil Engineering (MGSU) Candidate of Technical Sciences, Associate Professor, Department of Hydraulic Engineering and Water Resources, 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 .
  • Medzveliya Manana Levanovna - Moscow State University of Civil Engineering (MGSU) Candidate of Technical Sciences, Associate Professor, Department of Hydraulic Engineering, 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 .
  • Chemeris Ol’ga Gennad’yevna - Moscow State University of Civil Engineering (MGSU) postgraduate student, Department of Hydraulic Engineering and Water Resources, 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 .

Pages 145-153

The co-authors have designated the point for the identification of the critical velocity and intensity of the hydro-abrasive wear within the framework of the two-phase flow mechanics challenges. In this article, the two-phase flow is analyzed as the flow that has the solid phase, including ore particles, concentrates and tailings, solid fuel combustion products, sand, and construction materials, etc., and as the flow containing the liquid phase, or water. The authors have identified the influence produced by the presence of fine-dispersed solid particles in the two-phase flows that transport the milled ore concentrate due to the presence of the water. Variations in critical velocity values, driven by the per-cent clay content in the ore, were exposed to the experimental research performed by the Laboratory of Hydraulic Transportation at the Hydraulics Department, MGSU. The experimental data are consistent with the findings of the analysis of the influence produced by dust fractions on the critical velocity at the Eastern site’s placer of Malyshev deposit. The co-authors offer their methodology for the refinement of the critical velocity analysis depending on varied per cent clay content values; the diagram compiled in relative coordinates, and the approximative correlation required for practical applications. The proposed methodology consisting in feeding fine-dispersed additives into the two-phase flow, reduces the critical velocity.

DOI: 10.22227/1997-0935.2014.11.145-153

References
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  17. Vasil’eva M.A. Eksperimental’noe opredelenie raskhodno-napornykh kharakteristik gruntovykh nasosov v sisteme gidrotransporta khvostov obogashcheniya zheleznoy rudy [Experimental Determination of Flow-Pressure Characteristics of Groundwater Pumps in the System of Hydraulic Tailings of Iron Ore]. Vestnik Permskogo natsional'nogo issledovatel'skogo politekhnicheskogo universiteta. Geologiya. Neftegazovoe i gornoe delo [Proceedings of Perm National Research Polytechnic University]. 2013, no. 6, pp. 111—119. (In Russian)
  18. Anan’eskiy V.A., Mel’tser A.M. Osobennosti konstruktsii reguliruyushchikh klapanov dlya upravleniya potokami slozhnykh dvukhfaznykh rabochikh sred [Design Features of the Control Valves to Control the Flow of Two-phase Complex Working Environments]. Promislova g³dravl³ka ta pnevmatika (Promyshlennaya gidravlika i pnevmatika) [Industrial Hydraulics and Pneumatics]. 2006, no. 2, pp. 23—27. (In Russian)
  19. Maliska C.R., Raithby G.D. A Method for Computing Three Dimensional Flows Using Non-orthogonal Boundary-fitted Coordinates. Int. J. Num Meth. in Fluids. 1984, vol. 4, no. 6, pp. 519—537. DOI: http://dx.doi.org/10.1002/fld.1650040606.
  20. Mulenkov V.P., Kostylev Yu.V., Modorskiy V.Ya., Pershin A.M., Pisarev P.V., Sokolkin Yu.V. Chislennoe modelirovanie gidroabrazivnogo iznosa fasonnykh izdeliy truboprovodov [Numerical Modeling of Hydro-abrasive Wear Fittings Piping]. Aerokosmicheskaya tekhnika, vysokie tekhnologii i innovatsii : Materialy XII Vserossiyskoy nauchno-tekhnicheskoy konferentsii [Proceedings of the 12th All-Russian Scientific Technical Conference: Aerospace Engineering, High Technologies and Innovations]. Perm, 2009, pp. 42—45. (In Russian)

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RIVER BED EROSION IN COHESIVE SOILS

Vestnik MGSU 4/2013
  • Borovkov Valeriy Stepanovich - Moscow State University of Civil Engineering (MGSU) Doctor of Technical Sciences, Professor, Department of Hydraulics, Moscow State University of Civil Engineering (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation; mgsu-hydraulic@ yandex.ru; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Volynov Mikhail Anatol’evich - A.N. Kostyakov All-Russian Research Institute of Hydraulic Engineering and Land Reclamation (VNIIGiM) Candidate of Technical Sciences, Associate Professor, Chair, Department of Water Resources Management, A.N. Kostyakov All-Russian Research Institute of Hydraulic Engineering and Land Reclamation (VNIIGiM), 127550, 44 Bol’shaya Akademicheskaya St., Moscow, 127550 Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 143-149

Erosion of river beds in cohesive soils having aggregate or conjoint structure is considered in the article. The authors have identified dimensions of soil aggregates in the limit state of stability with account for turbulent pulsations of the bottom pressure, and the figures identified by the coauthors and specified in this article comply with the field data.The co-authors have derived a formula of critical velocity that takes account of correlation between the values of shear and tensile strength of cohesive soils. These values take account of the influence of hydraulic resistance and comply with the field data.The approach proposed by the co-authors may be employed to identify and substantiate conditions of the limit resistance to erosion for cohesive soils having aggregate or conjoint structure. Dependencies derived by the coauthors comply with the findings of experimental researches and the data provided in regulatory documents.

DOI: 10.22227/1997-0935.2013.4.143-149

References
  1. Velikanov M.A. Dinamika ruslovykh potokov [Channel Hydraulics]. Leningrad, Gidrometeoizdat Publ., 1946, 522 p.
  2. Grishanin K.V. Dinamika ruslovykh potokov [Channel Hydraulics]. Leningrad, Gidrometeoizdat Publ., 1969, 427 p.
  3. Debol’skiy V.K. K issledovaniyu razmyvayushchikh skorostey ruslovogo potoka [Research into Erosive Velocities of Bed Flows]. Trudy MIIT [Works of Moscow Institute of Transport Engineering]. No. 319. Moscow, Transport Publ., 1968, pp. 78—87.
  4. Elliott A.H., Spigel R.H., Jowett I.G., Shankar S.U., Ibbitt R.P. Model Application to Assess Effects of Urbanization and Distributed Flow Controls on Erosion Potential and Baseflow Hydraulic Habitat. Urban Water Journal. 2010, vol. 7, no. 2, pp. 91—107.
  5. Pickert G., Weitbrecht V., Bieberstein A. Breaching of Overtopped River Embankments Controlled by Apparent Cohesion. Journal of Hydraulic Research. 2011, vol. 49, no. 2, pp. 143—156.
  6. Regazzoni P.-L., Marot D. Investigation of Interface Erosion Rate by Jet Erosion Test and Statistical Analysis. European Journal of Environmental and Civil Engineering. 2011, vol. 15, no. 8, pp. 1167—1185.
  7. Mirtskhulava Ts.E. Razmyv rusel i metodika otsenki ikh ustoychivosti [Erosion of River Beds and Methods of Assessment of Their Stability]. Moscow, Kolos Publ., 1967, 177 p.
  8. Mostafa T.S., Imran J., Chaudhry M.H., Kahn I.B. Erosion Resistance of Cohesive Soils. Journal of Hydraulic Research. 2008, vol. 46, no. 6, pp. 777—787.
  9. Abou-Seida M.M., Elsaeed G.H., Mostafa T.M., Elzahry E.F. Local Scour at Bridge Abutments in Cohesive Soil. Journal of Hydraulic Research. 2012, vol. 50, no. 2, pp. 171—180.
  10. Lyatkher V.M. Turbulentnost’ v gidrosooruzheniyakh [Exposure of Hydraulic Engineering Structures to Turbulence]. Moscow, Energiya Publ., 1968, 408 p.
  11. Lelyavskiy S. Vvedenie v rechnuyu gidravliku [Introduction into River Hydraulics]. Leningrad, Gidrometeoizdat Publ., 1961, 228 p.
  12. 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.
  13. Zegzhda A.P. Gidravlicheskie poteri na trenie v kanalakh i truboprovodakh [Hydraulic Losses by Friction in Channels and Pipelines]. Moscow – Leningrad, Gos. izd-vo literatury po stroitel’stvu i arkhitekture publ., 1957, 277 p.
  14. Vremennye normy dopuskaemykh skorostey techeniya vody v postoyannykh zheleznodorozhnykh gidrotekhnicheskikh sooruzheniyakh [Temporary Norms of Acceptable Velocities of Water Flows inside Permanent Hydraulic Engineering Structures of Railroads]. Moscow, Transzheldorizdat Publ., 1952.
  15. Kiselev P.G. Gidravlika. Osnovy mekhaniki zhidkosti. [Hydraulics. Fundamentals of Liquid Mechanics]. Moscow, Energiya Publ., 1980, 360 p.

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Influence of properties of river soils on river bed movement

Vestnik MGSU 9/2012
  • Volgina Lyudmila Vsevolodovna - Moscow State University of Civil Engineering (MGSU) Candidate of Technical Sciences, Associate Professor 8 (495) 287-49-14, ext. 14-18, 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 .
  • Tarasov Vsevolod Konstantinovich - Moscow State University of Civil Engineering (MGSU) Doctor of Technical Sciences, Professor; +7 (495) 287-49-14, ext. 14-18, 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 .
  • Zommer Tatyana Valentinovna - Moscow State University of Civil Engineering (MGSU) Director, Laboratory of Hydraulics 8 (495) 287-49-14, ext. 14-18, 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 .

Pages 83 - 88

The authors consider the problem of conveyance of non-spherical solid particles in an open
rectangular channel. The process of glass container manufacturing is accompanied by formation of
waste glass at 1150...1350 °С. As a result, hot glass mass flows into cold water and transforms into
glass granules. Granules are used in the production of glass, and they can be loaded back into the
industrial furnace.
At this stage, there arises a problem of conveyance of waste glass granules into the gallery,
in the direction of the furnace. The pipeline-based method requires an engine, which will increase
the cost of glass containers. Hydraulic transportation of waste glass is a cheaper method. In this
connection, there is a practical problem of identifying the slope angle sufficient for the transportation
of waste glass in an open rectangular channel. Thus, we must determine the hydraulic characteristics
of the two-phase flow to solve the problem.
A laboratory research of the particle size distribution pattern was conducted in 2011 at the
glass factory in operation in the Tula region. The shape of particles and the condition of the glass surface affect the parameters of their hydraulic transportation. These characteristics are taken into
account when calculating the formula and introducing the correction coefficient.
The problem of determining the slope of the open channel needed to transport waste glass into
the glass melting furnace can be formulated as follows. What should be the angle of the bottom of
the channel for hydraulic transport of waste glass, when the particle speed reaches its critical value?
The input data are as follows: channel length - 70 meters, cross-section area - 1.4 m2. Hydraulic
transport of waste glass is produced under the influence of gravity, due to the difference in the height
of the upper and lower points of transportation.
Chezy coefficient helps determine the appropriate slope of the bottom of the channel. As
a result of the calculation of the angle of inclination of the bottom of the channel, the difference
between the upper and lower points was 2.17 m, the particle size of glass 4.76...17.97 mm, the
channel length - 70 m, height - 1 m, width - 1.4 m.
The benefits of free flow hydraulic transport include small operating costs. The main
disadvantage of hydraulic transport is the need for a substantial difference in the heights of upper
and lower points.
As a result, the authors have worked out their recommendations concerning the
transportation of y solid particles of waste glass.

DOI: 10.22227/1997-0935.2012.9.83 - 88

References
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  2. Puchkov L.A., Mikheev O.V. Gidrotransportnye sistemy gornodobyvayushchikh predpriyatiy [Hydraulic Transportation Systems of Mining Enterprises]. Moscow, MGK Association Publ., 2008.
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