Discharge of a Triangular Orifice under Free Flow Conditions

• Autorzy: Sosnowska Anna

Identyfikatory

DOI

10.1515/heem-2021-0002

• Języki publikacji: EN

Abstrakty

EN

In this paper, flow through a free triangular orifice is considered. The comparison of two formulas was conducted for discharge calculations: a large orifice formula and a small orifice formula. The results show that, above a certain value of upstream head to orifice height ratio there is no need for small-large formula discrimination. The differences in the outcomes for the two formulas are negligible for upstream head to orifice height ratios greater than 3. This means that a small orifice formula can be used instead of a large orifice formula. Calculations were performed for different variants of triangle orientation (with tip downwards, sidewards and upwards) as well as for different dimensions of orifice (equilateral and isosceles). The calculations also included different submergence levels of the upper edge of the orifice and variable dimensions of the orifice with constant upstream head. Neither of these conditions affect the relative deviation values for small and large orifice formulas.

Słowa kluczowe

EN

orifice; orifice equation; discharge

• Wydawca: Institute of Hydro-Engineering of Polish Academy of Sciences
• Czasopismo: Archives of Hydro-Engineering and Environmental Mechanics
• Rocznik: 2021
• Tom: Vol. 68, nr 1
• Strony: 19--28
• Opis fizyczny: Bibliogr. 6 poz., rys.

Twórcy

autor

Sosnowska Anna

• Faculty of Building Services, Hydro and Environmental Engineering, Warsaw University of Technology, Poland, ul. Nowowiejska 20, 00-653 Warszawa

Bibliografia

• Mitosek M. (2020) Fluid mechanics in environmental engineering and protection, Oficyna Wydawnicza Politechniki Warszawskiej, Warszawa (In Polish).
• Shammaa Y., Zhu D.Z. and Rajaratnam N. (2005) Flow Upstream of Orifices and Sluice Gates, Journal of Hydraulic Engineering, ASCE 131 (2), 127–133.
• Smith D. and Walker W. J. (1923) Orifice flow, Proc., Institution of Mechanical Engineers, 1 (1), 23–36.
• Stefański W. and Wyszkowski K. (1972) Tablice i wykresy do obliczeń z hydrauliki mechaniki cieczy i gazów (Tables and graphs for calculations in hydraulics mechanics of liquids and gases), Wydawnictwa Politechniki Warszawskiej, Warszawa.
• Vatankhah A. R. and Mirnia S. H. (2018) Predicting Discharge Coefficient of Triangular Side Orifice under Free Flow Conditions, Journal of Irrigation and Drainage Engineering, 144 (10), October 2018.
• Vatankhah A. R. and Bijankhan M. (2013) Discussion of “New method for modeling thin walled orifice flow under partially submerged conditions” by David Brandes and William T. Barlow, J. Irrig. Drain. Eng., 139 (9), 789–793, https://doi.org/10.1061/(ASCE)IR.1943-4774.0000584.

Uwagi

Opracowanie rekordu ze środków MNiSW, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2024).