Vestnik MGSU 1/2013
  • 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 185-189

The authors consider the viscosity and surface tension forces that produce their influence on the conditions of separation of the stream from a sharp crest weir. The authors have compiled an equation that takes account of the influence of all factors, including liquid pressure over the weir — H, weir height — P, liquid flow velocity — v, liquid density — ρ, dynamic viscosity — μ, surface tension σ, gravity acceleration — g, discharge per the unit of the weir width — q, width of the course — B. The authors have proven that the surface tension and liquid density are different for different types of liquids.As part of the experiment, a sharp crest weir was installed into a rectangular tray (6,000×100×200). The weir height was permanent, and it was equal to P = 60 mm. Experiments were conducted to register the moment of the flow separation from the weir wall. The experiment contemplated gradual pressure rise. The authors demonstrated that the stream separation from the weir wall that had a sharp crest occurred when the Weber’s number reached its critical value os that it was independent from the Reynold’s number.

DOI: 10.22227/1997-0935.2013.1.185-189

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