Sluice

About: Sluice is a research topic. Over the lifetime, 1983 publications have been published within this topic receiving 7477 citations.

Local Scour Downstream of an Apron

Abstract: Measurements have been made of the rate of scour downstream of a rigid apron due to a jet of water issuing through a sluice opening. Experiments are carried out for various sand sizes, sluice openings, efflux velocities, and lengths of apron. Mean velocity profiles in rigid models simulating the shape of the scour hole are studied in detail. They are found to exhibit similarity. Scales of velocity and length that are adopted bring together all the data concerning the decay of maximum velocity in the scour hole with respect to streamwise distance. A simple semi‐empirical theory based on a characteristic mean velocity in the scour hole is proposed to predict the time rate of scour. Predicted results are compared with experimental data.

Simultaneous Flow over and under a Gate

Abstract: This paper reports the results of an investigation carried out to establish the stage-discharge relationship for a flow simultaneously discharging over and under a sluice or a broad-crested gate. The stage-discharge relationship is deduced by a theoretical analysis, based on the application of the Π-theorem of the dimensional analysis and the incomplete self-similarity theory, coupled with an experimental investigation carried out by using a laboratory flume.

Apparatus for the individual conveying of printed products arriving in an imbricated product stream

Abstract: An apparatus for individually conveying printed products arriving in an imbricated product stream, comprising a number of driven controlled grippers revolving and guided in a closed path of travel for engaging the leading edge of the printed products. The gripper drive contains means for temporarily restraining the grippers. The gripper drive has at least one continuously driven sluice for the cycled recall of the restrained or stopped grippers. Operatively associated with the sluice is an endless revolving conveyor element equipped with entrainment members engaging the trailing edge of the products, the entrainment members being provided at a uniform spacing at the conveyor element. The conveyor element, as concerns the entrainment members, is driven in cycle with the sluice and opposite in sense to the sense of rotation or revolution of the grippers. There is also provided an infeed device having a drive operatively coupled with the drive of the sluice by a synchronous control.

Application of improved neuro-fuzzy GMDH to predict scour depth at sluice gates

Abstract: An improved neuro-fuzzy based group method of data handling using the particle swarm optimization (NF-GMDH-PSO) is developed as an adaptive learning network to predict the localized scour downstream of a sluice gate with an apron. . The input characteristic parameters affecting the scour depth are the sediment size and its gradation, apron length, sluice gate opening, and the flow conditions upstream and downstream of the sluice gate. Six non-dimensional parameters were yielded to define a functional relationship between the input and output variables. The training and testing of the NF-GMDH network are performed using published scour data from the literature. The efficiency of the training stages for the NF-GMDH-PSO is investigated. The testing results for the NF-GMDH network are compared with the traditional approaches based on regression method. A sensitivity analysis is carried out to assign the most significant parameter for the scour prediction. The results showed that the NF-GMDH-PSO network produced lower error in scour prediction than all other models.

Underflow of standard sluice gate

Abstract: Gate flow is known to be subjected by scale effects. This experimental project adds to the understanding of effects of viscosity and surface tension. Minimum gate openings as a function of channel width are presented for water flow such that the Froude similarity law applies. Also, the upstream extension of the so-called Reynolds ridge is determined. Further, results are provided to the pressure distributions on the channel bottom and the gate for inviscid flow conditions. The velocity distribution in the gate vicinity is also described. Then, the height and position of shock waves downstream of the gate section are determined. The corner vortices due to stagnation flow are investigated and means of reduction are evaluated. A novel anti-vortex element is described that reduces shock waves to about 50% as compared to untreated gate flow. The device can be simply added to existing gates.