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HYDRAULICS. ENGINEERING HYDROLOGY. HYDRAULIC ENGINEERING

Effect of the physical properties of a liquid on discharge coefficient in case of efflux from under the gate

Vestnik MGSU 10/2014
  • 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 .
  • Volgina Lyudmila Vsevolodovna - Moscow State University of Civil Engineering (MGSU) andidate of Technical Sciences, Associate 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 .

Pages 147-152

Hydraulic engineering models are usually calculated according to Fraud law. Though in the process of small size models operation also viscosity and service tension forces become essential and we can’t neglect them.
The article considers the influence of viscosity and surface tension on discharge coefficient in case of efflux from under the gate. In the article the technique of carrying out experiments is stated, the equation is presented, which considers the influence of all factors: pressure, speed of liquid, liquid density, dynamic, superficial tension, gravity acceleration, unit discharge, width of the course, opening height. The surface tension and the liquid density for the used liquids changed a little. The gate was established in a rectangular trough (6000×100×200).
It is shown that with the increase of Reinolds number (at a relative opening a/H = 00,04…0,03 and Webers number
We > 250) the discharge coefficient rises and no longer depends on the Reinolds number, at Re > 2000 and Webers number (at constant values of Reinolds numbers) practically does not influence the discharge coefficient.

DOI: 10.22227/1997-0935.2014.10.147-152

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