Hydraulic Energy Dissipators - A Review
Hydraulic Energy dissipators are devices to protect downstream areas of basin from erosion by reducing the velocity of flow up to an acceptable limit. The stilling basins are transition structures fabricated to dissipate excess energy confined by flow with high velocity at the outlet of conduit or tunnel so that the flow beyond the basin does not threaten the firmness of bed and banks of downstream channel in structures like culvert spillways, canal, etc. from scouring. Henceforth proper attention needed by hydraulic engineers for t he design of energy dissipators so as to obtain optimum energy dissipation at outlet. The type of stilling basin most suitable at a particular location mainly depends upon initial velocity of flow and initial Froude Number. This paper describe about the different type of energy dessipators with different appurtanances used in hydraulic structures for protection work.
ANALYSIS OF BAFFLE WALL GAP IN THE DESIGN OF STILLING BASIN MODEL
This paper investigates the gap of baffle wall in stilling basin design for the enhancement of energy dissipation in order to protect the downstream structures from excessive scouring. Experiments have been carried out by keeping the baffle wall at same location for Froude numbers 3.85, 2.85 and 1.85 to evolve the new stilling basin model by changing the gap beneath the wall above the basin. Performance of outlet basins having baffle wall of at same location with varying the gap were evaluated based on dimensionless number called as performance index (PI), which is the ratio of grains Froude number to scour index. Higher values of PI indicate better performance of the basin. It is concluded that by placing the appropriate baffle wall size at suitable location with proper gap, the efficiency of basin increases.
EXPERIMENTAL INVESTIGATION ON COUPLING EVACUATED HEAT PIPE COLLECTOR ON SINGLE BASIN SINGLE SLOPE SOLAR STILL PRODUCTIVITY
Solar still is very important device to convert the available brackish water into drinkable water. Here work is carried out to know the effect of coupling an Evacuated Heat Pipe Collector on the solar still. Other different parameters like Water depth, Sun direction and solar radiation to enhance the productivity. It has found that coupling an Evacuated Heat pipe collector with a solar still has increased the productivity by 32%. Also it has found that the productivity is reduced while using higher water depth and solar insolation is directly proportional to the Productivity.