Experimental and Numerical Investigations on the Effect of Rectangular Openings’ Aspect Ratio on Outflow Discharge

Journal of Applied and Computational Mechanics

Mohammadreza Jalili Ghazizadeh¹  Aram Soroushian²  Mahmood Hosseini³  Abdolreza Astaraki⁴ 

[1]Assistant Professor, Civil, Water and Environmental Engineering Department, Shahid Beheshti University, Tehran 1658953571, Iran

[2]Assistant Professor, Structural Engineering Research Center, International Institute of Earthquake Engineering and Seismology (IIEES),Tehran 19537, Iran

[3]Associate Professor, Structural Engineering Research Center, International Institute of Earthquake Engineering and Seismology (IIEES), Tehran 19537, Iran

[4]Ph.D. Student, Structural Engineering Research Center, International Institute of Earthquake Engineering and Seismology (IIEES), Tehran 19537, Iran

关键词: Rectangular opening;    Aspect ratio;    Leakage discharge;    Finite volume method;    Orifice formula;   

DOI  :  10.22055/jacm.2018.25519.1275

来源: DOAJ

【 摘 要 】

Up to now, a few formulas have been suggested by scholars for the amount of discharge from openings, however, the effect of opening's geometry on the amount of discharge has not addressed thoroughly. In this study, to assess the effect of rectangular openings’ aspect ratio on the discharge amount, experimental and numerical investigations have been conducted on the discharge amount from rectangular openings at the bottom of tanks. In the experimental part of the study different water depths have been considered and the amounts of discharge have been measured for openings with identical area, but different aspect ratios. In the numerical part of the study the test results have been compared to those obtained from finite-volume-based numerical simulation. The experimental and numerical results are in good agreement, and both show that there is a trend of increase in the amount of discharge with increase of the opening’s aspect ratio. The amount of this increase is from 13% to 21% for hydraulic head varying between 0.3 to 0.6 meters. On this basis, the conventional orifice formula for calculation of the rectangular opening discharge needs modification.

【 授权许可】

Unknown