Inclined porous screen walls performance on the energy dissipation in a laboratory flume

Screens have proven to be an optimum choice for dissipating the kinematic energy formed at the downstream of small hydraulic structures when they are compared to the classical hydraulic jump. This paper presents the performance of the inclined porous screens in the laboratory flume. Three different diameters holes of screens are tested with considering the sluice gate at the upstream of the screens to be presumed as the downstream of hydraulic structure with opening depth 2.5 cm, Different inclinations of screens, with a fixed porosity of 40%, are tested in different orientation to the flow direction. The flow rate in the flume is changed four times which is varied from 0.012 m³/s to 0.023 m³/s. Results show that the inclination of screen has good performance in dissipation of energy compared to the classical of hydraulic jump. But changing the inclination of screen does not have a significant impact on the system of dissipation energy. However, there is a variance in magnitude of the energy dissipation with same angle but that has minor effect to the system of flow. General trends of dissipation energy in all tests show that increasing the Froude number leads to increase the performance of energy dissipation regardless the properties of screens in test cases. Furthermore, the rectangular distribution of holes also has no significant impact in energy dissipation compared with the triangular holes distribution. MATLAB and Microsoft Excel 2010 software have been used for analyzing and obtaining the results.