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Estimation of discharge coefficients for orifices thin-walled, in physical models

Abstract:

Introduction This research seeks the conceptualization of the theories and the methodological development to achieve the objective that is to contribute to the experimental knowledge about discharge coefficients for circular holes of thin wall, not submerged, given the limited information found on them. The Materials and methods consisted of developing an experimental physical model, which was developed in the Pilot Laboratory of Hydraulics of the Faculty of Mathematical and Physical Sciences, University of Guayaquil–Ecuador, located at 4.00 meters above sea level, with an average ambient temperature of 26 ° C and an average relative humidity of 75%. We built 8 circular holes between 6 and 48 mm in diameter using polymethylmethacrylate (acrylic) as a material, approximately 300 data were considered through the experimental method, in which, the actual flow was evaluated volumetrically, while the discharge coefficient was determined by the relationship between real flow and theoretical flow rate, resulting in discharge coefficients ranging between 0.76–0.56, results presented in the abacus FCMF-UG-Cd-OCPD-2018, which considers the discharge coefficient vs the hydrostatic head / hole diameter ratio. Through comparisons with bibliographic sources. Conclusion: The values of discharge coefficients obtained in this investigation are valid according to the study flow conditions, these being of great contribution to these structures where holes are used such as desarenadores, catchments and drains