Author(s): Chaiyuth Chinnarasri; Varangrat Juntasaro
Linked Author(s):
Keywords: Stepped chute; Energy dissipation; Numerical simulation; Pressure distribution; End sills
Abstract: In the present study, the physical studies of stepped chutes with end sills from the previous research are simulated in a numerical model. Three different heights of the end sill and a model of a stepped chute without an end sill are built. The relative height of the end sill, m/h, is varied from 0. 067– 0. 200 where m is the height of the end sills and h is the step height. The flow characteristics, energy dissipation, velocity profile, and pressure distribution are studied. It can be demonstrated that the flow over a stepped chute with an end sill can be satisfactorily simulated in the numerical model. The different heights of the end sill differently affect the flow characteristics near the tip of the step. The energy dissipation is also affected by the end sill. For the step with the end sill, the high turbulence and energy dissipation were found to be at least 10% higher than in the horizontal step. The stepped chute with the higher end sill height can dissipate more energy than the stepped chute with the lower end sill height. The maximum velocity of the stepped chute without an end sill is greater than that with an end sill at the same observed location. In addition, the pressure distributions on the vertical and horizontal step faces are investigated.
Year: 2013