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HYDRAULICS. ENGINEERING HYDROLOGY. HYDRAULIC ENGINEERING

DISCHARGE RATIO OF THE BROAD-CRESTED WEIR FLOWIN THE LOW HEAD AREA

Vestnik MGSU 4/2013
  • 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 .
  • Pipiya Valeriy Valerianovich - Breesize Trading Limited Candidate of Technical Sciences, Senior Project Engineer, Breesize Trading Limited, 42 Mosfil’movskaya St., Moscow, 119285, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 167-171

The authors consider the influence of the Reynolds number on the discharge ratio of the broad-crested weir. The authors provide an overview of their experiment in thearticle. They provide the equation that takes account of each factor of influence, including H — pressure over the broad-crested weir, P — weir height above the bottom, v — liquid velocity, ρ — liquid density, μ — dynamic viscosity, g — superficial tension, σ — gravity acceleration, q — per-unit weir flow, B — width of the weir, L — length of the weir. Superficial tension and liquid density values have minor differences for different fluids.A broad-crested weir flow was organized in the rectangular tray (6,000×100×200). The flow had the following dimensions: weir length L = 40 mm, weir height P = 50 mm, weir width B = 100 mm. The findings of the experiment have proven that the increase in the Reynolds number causes the increase in the broad-crested weir flow discharge ratio (at the pre-set relative pressure) and it approaches the constant value at Re ≈ 2000.

DOI: 10.22227/1997-0935.2013.4.167-171

References
  1. Chugaev R.R. Gidravlika [Hydraulics]. Moscow, Energiya Publ., 1975, 671 p.
  2. Linford A. The Application of Models to Hydraulic Engineering-reservoir Spillways. Water and Water engn. October 1965, pp. 411—417.
  3. Al’tshul’ A.D. Istechenie iz otverstiy zhidkostey s povyshennoy vyazkost’yu [Outflows of Hyper-viscosity Liquids through Holes]. Neftyanoe khozyaystvo [Crude Oil Economy]. 1950, no. 2, pp. 55—60.
  4. Zegzhda A.P. Teoriya podobiya i metodika rascheta gidrotekhnicheskikh modeley [Similarity Theory and Methodology of Analysis of Hydraulic Engineering Models]. Moscow, Gosstroyizdat Publ., 1938, 220 p.
  5. Kisilev P.G. Osnovy mekhaniki zhidkosti [Fundamentals of Liquid Mechanics]. Moscow, Energiya Publ., 1980, 337 p.
  6. Medzveliya M.L., Pipiya V.V. Usloviya obrazovaniya svobodnoy strui na vodoslive s ostrym porogom [Conditions of Formation of a Free Flow over a Sharp Crest Weir]. Vestnik MGSU [Proceedings of Moscow State University of Civil Engineering]. 2013, no. 1, pp. 185—189.
  7. Berezinskiy A.R. Propusknaya sposobnost’ vodosliva s shirokim porogom [Throughput of a Broad-crested Weir]. Moscow – Leningrad, Stroyizdat Publ., 1950, 149 p.
  8. Al’tshul’ A.D. Gidravlicheskie soprotivleniya [Hydraulic Resistances]. Moscow, Nedra Publ., 1982, 223 p.

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The coefficient of discharge in a channel with side narrowing

Vestnik MGSU 6/2015
  • 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 .

Pages 110-114

The author considers the influences of the forces of viscosity and superficial tension on the discharge ratio in a channel with side narrowing. In the article the equation is presented that takes into account the influence of all the factors: the pressure, the speed of the liquid, liquid density, dynamic viscosity, superficial tension, gravity acceleration, expense per unit of width, width of the course, width of narrowing. Superficial tension and liquid density for the used liquids changed a little.The narrowing in the rectangular tray was achieved by force of flowing liquid between rectangular parallelepipeds, which were attached to the wall of the tray. The dimensions of the rectangular parallelepipeds were: the length L = 200 mm, the width B = 33 mm, and the depth of the mouth b = 34 mm.The findings of the experiment proved that the increase in the Reynolds number causes the increase flow discharge ratio and it approaches the constant value at Re ? 4000.

DOI: 10.22227/1997-0935.2015.6.110-114

References
  1. Kabiri-Samani A.R., Shams M.-R. Discharge Coefficient of Subsurface Weirs. Proceedings of the Institution of Civil Engineers. Water Management. 2014, vol. 167, no. 4, pp. 187—193. DOI: http://dx.doi.org/10.1680/wama.12.00050.
  2. Ramamurthy A.S., Kai J., Han S.S. V-Shaped Multislit Weirs. Journal of Irrigation and Drainage Engineering. 2013, vol. 139, no. 7, pp. 582—585. DOI: http://dx.doi.org/10.1061/(ASCE)IR.1943-4774.0000574.
  3. Aydin I., Ger A.M., Hincal O. Measurement of Small Discharges in Open Channels by Slit Weir. Journal of Hydraulic Engineering. 2002, vol. 128, no. 2, pp. 234—237. DOI: http://dx.doi.org/10.1061/(ASCE)0733-9429(2002)128:2(234).
  4. Ranga Raju K.G., Srivastava R., Porey P.D. Scale Effects in Modelling Flow over Broad-Crested Weirs. Irrigation & Power. 1990, vol. 47, no. 30, pp. 101—106.
  5. Roche N., Daïan J.-F., Lawrence D.S.L. Hydraulic Modeling of Runoff over a Rough Surface under Partial Inundation. Water Resources Research. 2007, vol. 43, no. 8. W08410, pp. 1—11. DOI: http://dx.doi.org/10.1029/2006wr005484.
  6. Raju R., Asawa L. Viscosity and Surface Tension Effects on Weir Flow. J. of the Hydraulics div. ASCE. 1977, vol. 103, no. 10, pp. 1227—1231.
  7. Raju R., Ali J., Ahmad J. Discharge Relationship for Suppressed and Contracted. Thin-plate Weirs. J. of the Inst. of Engnrs. India. 1972, vol. 52, no. 11, pp. 286—293.
  8. Zhang K., Wang G., Sun X., Yang F., Lü H. Experiment on Hydraulic Characteristics of Shallow open Channel Flow on Slope. Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering. 2014, vol. 30, no. 15, pp. 182—189. DOI: http://dx.doi.org/10.3969/j.issn.1002-6819.2014.15.024.
  9. Maxwell W., Hall C., Weggel J. Surface Tension in Froude Models. J. of Hydraulics Division. ASCE. 1969, vol. 95, no. HY2, March, pp. 677—704.
  10. Milano V. Ricerca sperimentale sull eflusse di cerenti lente au stramazzi in parete sottile a bassa soglia. Idrotecnica. 1981, no. 6, pp. 263—274.
  11. Linford A. The Application of Models to Hydraulic Engineering — Reservoir Spill-ways. Water and Water Engn. Oct. 1965, pp. 411—417.
  12. Medzveliya M.L., Pipiya V.V. Usloviya obrazovaniya svobodnoy strui na vodoslive s ostrym porogom [Conditions of Formation of a Free Flow over a Sharp Crest Weir]. Vestnik MGSU [Proceedings of Moscow State University of Civil Engineering]. 2013, no. 1, pp. 185—189. (In Russian)
  13. Al’tshul’ A.D. Istechenie iz otverstiy zhidkostey s povyshennoy vyazkost’yu [Outflows of Hyperviscosity Liquids through Holes]. Neftyanoe khozyaystvo [Crude Oil Economy]. 1950, no. 2, pp. 55—60. (In Russian)
  14. Medzveliya M.L., Pipiya V.V. Koeffitsient raskhoda vodosliva s shirokim porogom v oblasti malykh naporov [Discharge Ratio of the Broad-crested Weir Flow in the Low Head Area]. Vestnik MGSU [Proceedings of Moscow State University of Civil Engineering]. 2013, no. 4, pp. 167—171. (In Russian)
  15. Medzveliya M.L. Uchet poverkhnostnogo natyazheniya pri gidravlicheskom modelirovanii vodosliva s ostroy kromkoy [Account for the Surface Tension in Hydraulic Modeling of the Weir with a Sharp Threshold]. Vestnik MGSU [Proceedings of Moscow State University of Civil Engineering]. 2014, no. 9, pp. 100—105. (In Russian)

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