EFFECT OF VARYING ORIFICE THICKNESS ON THE DISCHARGE COEFFICIENT FOR DIFFERENT ORIFICES SHAPES | ||
| Engineering Research Journal (Shoubra) | ||
| Volume 48, Issue 1, April 2021, Pages 148-163 PDF (1.91 M) | ||
| Document Type: Research articles | ||
| DOI: 10.21608/erjsh.2021.263980 | ||
| Authors | ||
| AHMED M. ABDELRAHMAN* 1; AMIR M. MOBASHER2 | ||
| 1Canadian Higher Institute for Business and Engineering Technology | ||
| 2Al-Azhar University, Faculty of Engineering, Civil Engineering Department | ||
| Abstract | ||
| One of the most important factors to be studied carefully is the discharge coefficient “Cd” through the orifices, which reflects the efficiency of the flow and plays an important role in the design of hydraulic units. The purpose of this paper is to investigate experimentally the effect of changing orifice thickness on the discharge coefficient for water flow through different orifice shapes and comparing each other. To achieve this goal, four orifices shapes were used: circular, square, equilateral triangle and rectangular, five different thicknesses (9.25, 7.5, 6.75, 4 and 2 mm) were tested. It should be noted that the tests were conducted on four different values of the pressure heads affecting the center of the hole: (35, 40, 45 and 50 cm). Bernoulli's equation was used as a theoretical basis for calculating the discharge coefficient. The results of the study demonstrated that the changing in the thickness of the orifice affects the coefficient of discharge. The coefficient of discharge gradually decreases when the ratio (orifice thickness “t”/orifice equivalent diameter “d”) increases, with the fixity of both the orifice area and the vertical pressure head located above the center of the orifice. In all the analytical comparisons made in this study it was observed that circular orifices give the highest values of the coefficient of discharge compared to all other shapes followed by equilateral triangular orifices and then square orifices and finally it was observed that rectangular orifices give the lowest values of the coefficient of discharge. | ||
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